scispace - formally typeset
Search or ask a question

Showing papers on "Tetrahedral molecular geometry published in 2013"


Journal ArticleDOI
TL;DR: The reaction of a methanolic solution with bis(2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl)amine (bedmpza) in the presence of NaN(3) afforded five mononuclear complexes, which represent the first example in the literature that has simultaneously two moieties with ferro- and antiferromagnetic interactions.
Abstract: The reaction of a methanolic solution containing M(ClO4)2·nH2O (M = Cu, Ni, Zn or Cd) or CoCl2·6H2O with bis(2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl)amine (bedmpza) in the presence of NaN3 afforded the complexes [Cu(bedmpza)(μ1,1-N3)]2(ClO4)2 (1), [Ni(bedmpza)(N3)(μ1,1-N3)]2·1.5H2O (2), [Co(bedmpza)(N3)2] (3), [Zn(bedmpza)(N3)]ClO4 (4) and [Cd(bedmpza)(N3)(μ1,1-N3)]2·1.5H2O (5). The five complexes were characterized by spectroscopic techniques and their molecular structures were determined by single crystal X-ray crystallography. The two mononuclear complexes 3 and 4 display distorted TBP and tetrahedral geometry, respectively with the azide ions acting as monodentate ligands. Doubly bridged end-on-azido dinuclear complexes were obtained in the remaining compounds. Compounds 2 and 5 are isomorphic with distorted octahedral geometry, whereas distorted square pyramidal geometry was determined in the Cu(II) complex 1. The magnetic properties for complexes 1 and 2 were investigated by measuring the magnetic susceptibilities at variable temperatures (300–2 K). The Ni(II) complex exhibits moderate ferromagnetic coupling, whereas [Cu(bedmpza)(μ1,1-N3)]2(ClO4)2 (1) which contains two crystallographic independent dinuclear subunits in the unit cell, with different Cu–N(N3)–Cu bond angles, reveals different signs in the magnetic coupling. The complex represents the first example in the literature that has simultaneously two moieties with ferro- (J = 15.4 cm−1) and antiferromagnetic (J = −18.9 cm−1) interactions.

76 citations


Journal ArticleDOI
TL;DR: A triazole ligand act as bidentate that coordination to the metal ions through sulphur and amine group and a tetrahedral geometry was suggested for these complexes except Cu (II) complexes which exhibit a square structure.
Abstract: Series of coordination complexes of Ni(II), Cu(II), Zn(II), Cd(II) and Sn(II) metal with 4-amino-5-(pyridyl)-4H-1,2,4-triazole-3-thiol, as a ligand has been successfully prepared in alcoholic medium. The prepared complexes were characterized quantitatively and qualitatively by using: microelemental analysis, FTIR spectroscopy, UV-visible spectroscopy, 1H and 13C NMR, magnetic susceptibility and conductivity measurements. This triazole ligand act as bidentate that coordination to the metal ions through sulphur and amine group. According to the spectral data of the complexes a tetrahedral geometry was suggested for these complexes except Cu (II) complexes which exhibit a square structure.

51 citations


Journal ArticleDOI
TL;DR: A series of glutarimide derivatives which has two carbonyl coordination sites for intramolecular pentacoordination at silicon with a X(1+n)SiC(3-n)O moiety have been synthesised and characterized and offer a model for nucleophilic substitution at a silicon atom.
Abstract: A series of glutarimide derivatives which has two carbonyl coordination sites for intramolecular pentacoordination at silicon with a X1+nSiC3−nO moiety have been synthesised and characterized. The substituent (leaving group) effects on the Si–O bond exchange between the two coordination sites (resembling a pendulum) have been studied by comparison of the differently substituted (X = F, Cl, OTf, Br and I) structures. The activation parameters for the Si–O bond exchange process were measured by NMR and separately computed and are consistent with the strength of Si–O bond coordination and the nature of the leaving group, X. The temperature-dependent 29Si NMR spectroscopy is supported by X-ray crystallography and shows that the tetrahedral reactant is converted into pentacoordinate intermediates by intramolecular O–Si association followed by reversion to a tetrahedral geometry by Si–X dissociation. The two association/dissociation patterns offer a model for nucleophilic substitution at a silicon atom. A continuum of structures on the SN2 reaction profile from the glutarimide derivatives correlates reasonably well with the structural data obtained from derivatives of lactams, diketopiperazines and quinolones.

38 citations


Journal ArticleDOI
TL;DR: DFT calculations reveal that in the solid-state, this complex exhibits a squashed tetrahedral structure about the Co center to maximize ketimide-to-cobalt π-donation.

37 citations


Journal ArticleDOI
TL;DR: Two coordination polymers, namely [Co2(L1)2(btec)]∙4H2O}n (1) and [Co(L2)(btec)0.5(H2E)]n (2), have been synthesized and characterized by physicochemical and spectroscopic methods as well as single-crystal diffraction as discussed by the authors.
Abstract: Two coordination polymers, namely {[Co2(L1)2(btec)]∙4H2O}n (1) and [Co(L2)(btec)0.5(H2O)]n (2) [L1 = 1,3-bis(5,6-dimethylbenzimidazole)propane, btec = 1,2,4,5-benzenetetracarboxylate, L2 = 1,2-bis(5,6-dimethylbenzimidazole-1-ylmethyl)benzene], have been synthesized and characterized by physicochemical and spectroscopic methods as well as single-crystal diffraction. The cobalt(II) atoms display different environments with a tetrahedral geometry in 1 and trigonal–bipyramidal geometry in 2. Both complexes show 2D layer structures with a rare binodal (3,4)-connected topology structure, named 3,4L13. Their catalytic activities were tested for the degradation of congo red azo dye in a Fenton-like process.

31 citations


Journal ArticleDOI
TL;DR: In this article, six new organotin(IV) complexes with general formula R3SnL/R2SnL2 were synthesized and structurally characterized by elemental analyses, FT-IR, NMR (1H and 13C) spectral studies, and mass spectrometry.

26 citations


Journal ArticleDOI
TL;DR: In this paper, the reactions of AgNO3, PhHgOAc and HgCl2 with Hmmtrz gave three new complexes, [Ag(mmtrz)(PPh3)2]·Hmmtrz (1), [Hg2(mtrz)4(hmtrz)-2] (2) and [hg(mdrz)2]-n (3) (mtrZ-2]n(3) = 3-mercapto-4-methyl-4H-1,2,4-

26 citations


Journal ArticleDOI
TL;DR: Two complexes of dimethyl pyridine-2,6-dicarboxylate (L), [CdL3][CdI4] (1) and [Ag(L)NO3]n (2) were prepared and identified by elemental analysis, FT-IR, Raman and 1H NMR spectroscopy, cyclic voltammetry, and single-crystal X-ray diffraction as mentioned in this paper.
Abstract: Two complexes of dimethyl pyridine-2,6-dicarboxylate (L), [CdL3][CdI4] (1) and [Ag(L)NO3]n (2) were prepared and identified by elemental analysis, FT-IR, Raman and 1H NMR spectroscopy, cyclic voltammetry, and single-crystal X-ray diffraction. The crystal structure of 1 contains both complex cation and complex anion of the metal. Cadmium in [CdL3]2+, coordinated by three nitrogens and six oxygens, has a distorted tricapped trigonal prismatic geometry while [CdI4]2−, with four coordinated iodides, has a slightly distorted tetrahedral geometry. In the crystal structure of 2, silver has distorted tetrahedral geometry by coordination of nitrogen and three oxygens. One oxygen of nitrate in 2 bridges two silvers. Extension of these bridges forms a 1-D coordination polymer. Cyclic voltammetry of L reveals two reduction steps which are shifted after coordination in 1, while no significant shifts are observed in 2. Hydrogen bonds including C–H I, C–H O and C–H C and short interactions such as C I, , and O are compa...

25 citations


Journal ArticleDOI
TL;DR: A one-pot protocol has been developed to obtain a series of luminescent heteroleptic diarylborinic complexes bearing the 2-fluoro-3-pyridyl and another aryl group attached to the boron atom chelated with a simple or functionalized 8-oxyquinolinato ligand.
Abstract: A one-pot protocol has been developed to obtain a series of luminescent heteroleptic diarylborinic complexes bearing the 2-fluoro-3-pyridyl and another aryl group attached to the boron atom chelated with a simple or functionalized 8-oxyquinolinato ligand. The tetrahedral geometry around the boron atom in all compounds has been established by the 11B NMR spectroscopy and/or X-ray diffraction technique. In the solution, the obtained complexes have emission maxima ranging from 502 to 525 nm at room temperature. The quantum yield of emission significantly depends on the type and position of the substituents in the 8-oxyquinolinato ligands and aryl rings. An interpretation of the experimental UV–vis absorption and emission spectral data is supported by theoretical calculations of the frontier molecular orbitals. Marcus theory was used to theoretically evaluate charge-transport properties of the obtained complexes.

25 citations


Journal ArticleDOI
TL;DR: The Natural Bond Orbital analysis was carried out as a way to study the Zn(II) hybridization leading to the pseudo tetrahedral geometry of the framework of the [Zn(DDTC)(2)] complex, and to study also which are the donor NBO and the acceptor NBO in meaningful charge transfer through the Second Order Perturbation Theory Analysis of Fox Matrix in NBO basis.

25 citations


Journal ArticleDOI
TL;DR: In this paper, two mononuclear and one binuclear Cu(I) complexes that contain imidazole derivative ligands including 2-(2′-pyridyl)imidazoles (L1), 2-( 2′-polycyclic pyroxyl)benzimidyl(L2), and 2,6-bis (benzimeridazol-2yl)-pyridine (L3) were synthesized.

Journal ArticleDOI
TL;DR: A series of substituted 2-hydroxysalicylidine benzohydrazides were converted into their phenyl-boron complexes in good yields upon reaction with phenylboronic acid as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this article, X-ray diffraction showed that the M2+ cations are coordinated by two terminal N-bonded thiocyanato anions and two substituted pyridine ligands in a distorted tetrahedral geometry.
Abstract: Reaction of cobalt(II) thiocyanate or zinc(II) thiocyanate with 2-methylpyridine, 2-bromopyridine and 2-chloropyridine at room-temperature lead to tetrahedral complexes of composition M(NCS)2L2 (M = Co, Zn; 1: L = 2-methylpyridine, 2: L = 2-bromopyridine, 3: L = 2-chloropyridine). For all compounds, X-ray diffraction showed that the M2+ cations are coordinated by two terminal N-bonded thiocyanato anions and two substituted pyridine ligands in a distorted tetrahedral geometry. In all cases, complexes derived from cobalt and zinc with the same ligands are isomorphous. Eight crystalline solids were studied, which belong to only two different structure types: two polymorphs were obtained for the compounds with 2-chloropyridine: 3-Mα is isotypic with the 2-methylpyridine complexes 1-M and crystallizes in the orthorhombic space group P212121, whereas 3-Mβ and the isotypic 2-bromopyridine complexes 2-M adopt space group Pbcn. The structure types differ with respect to molecular conformation and packing: the complexes crystallizing in the former type are less distorted with respect to metal coordination; in the latter structure type, the angle subtended by the two ligands is by far the largest in the coordination sphere. P212121 allows for a more efficient intermolecular arrangement, whereas the complex geometry in Pbcn features shorter non-bonding distances between the ortho substituents of the pyridine ligands and comes closer to the gas phase geometry. DSC measurements gave no hints of a transformation between these modifications but from a melt of 3-Coα, 3-Coβ was obtained. Solvent mediated conversion experiments revealed that 3-Mα represents the thermodynamically stable form at room-temperature whereas 3-Mβ is metastable, in agreement with its lower density. Therefore, the thermodynamically stable phases with 2-chloropyridine as ligand adopt the crystal structure of the compounds with 2-methylpyridine, whereas the metastable forms are isotypic to the compounds with 2-bromopyridine.

Journal ArticleDOI
TL;DR: In this paper, the reaction of α-keto stabilized sulfonium ylides (Me)2SCHC(O)C6H4R (R = p-NO2 (Y) and p-Br(Y′)) with HgX2 (X = Cl, Br and I) in equimolar ratios using methanol as solvent leads to two types of products.

Journal ArticleDOI
TL;DR: Some tricyclohexyltin(IV) carboxylates, HOOC-R-COOSn(c-C6H11)3 (1) and (c-c6H 11)3(2) were synthesized under microwave irradiation in this paper.
Abstract: Some tricyclohexyltin(IV) carboxylates, HOOC–R–COOSn(c-C6H11)3 (1) and (c-C6H11)3SnOOC–R–COOSn(c-C6H11)3 (2) [R = 1,2-C6H4 (a), 1,2-C6F4 (b), (Z)-CH=CH (c), CH2CH2 (d)], have been synthesized from reaction of tricyclohexyltin hydroxide with cyclic dicarboxylic anhydrides under microwave irradiation in 1 : 1 and 2 : 1 M ratio, respectively, and characterized by elemental analysis, IR and NMR (1H, 13C, and 119Sn) spectra. Crystal structures of 1a–1c and 2d are determined by X-ray single crystal diffraction. The carboxylate in each compound is monodentate to tin. Compounds 1a and 1c possess a trans-C3SnO2 trigonal bipyramidal geometry with axial positions occupied by carboxylate and carbonyl oxygen of carboxylate of an adjacent molecule forming a one-dimensional chain. Compound 1b is tetrahedral and forms R 2 2(8) hydrogen-bonded dimers by pairs of intermolecular O–H O hydrogen bonds between two carboxylic acid groups. Compound 2d is dinuclear with tin possessing distorted tetrahedral geometry; a trimer supr...

Journal ArticleDOI
TL;DR: The Lewis acidity of the group 13 halides may play a decisive role in the formation of 1D polymeric networks.
Abstract: Solid state structures of group 13 metal halide complexes with pyrazine (pyz) of 2 : 1 and 1 : 1 composition have been established by X-ray structural analysis. Complexes of 2 : 1 composition adopt molecular structures MX3·pyz·MX3 with tetrahedral geometry of group 13 metals. Complexes of AlBr3 and GaCl3 of 1 : 1 composition are 1D polymers (MX3·pyz)∞ with trigonal bipyramidal geometry of the group 13 metal, while the weaker Lewis acid GaI3 forms the monomeric molecular complex GaI3·pyz, which is isostructural to its pyridine analog GaI3·py. Tensimetry studies of vaporization and thermal dissociation of AlBr3·pyz and AlBr3·pyz·AlBr3 complexes have been carried out using the static method with a glass membrane null-manometer. Thermodynamic characteristics of vaporization and equilibrium gas phase dissociation of the AlBr3·pyz complex have been determined. Comprehensive theoretical studies of (MX3)n·(pyz)m complexes (M = Al, Ga; X = Cl, Br, I; n = 1, 2; m = 1–3) have been carried out at the B3LYP/TZVP level of theory. Donor–acceptor bond energies were obtained taking into account reorganization energies of the fragments. Computational data indicate that the formation of (MX3·pyz)∞ polymers with coordination number 5 is only slightly more energetically favorable than the formation of molecular complexes of type MX3·pyz for X = Cl, Br. It is expected that on melting (MX3·pyz)∞ polymers dissociate into individual MX3·pyz molecules. This dovetails with low melting enthalpies of the (MX3·pyz)∞ complexes. Polymer stability decreases in the order AlCl3 > AlBr3 > GaCl3 > AlI3 > GaBr3 > GaI3. For MI3·pyz complexes computations predict that the monomeric structure motif is more energetically favorable compared to the catena polymer. These theoretical predictions agree well with the experimentally observed monomeric complex GaI3·pyz in the solid state. Thus, the Lewis acidity of the group 13 halides may play a decisive role in the formation of 1D polymeric networks.

Journal ArticleDOI
TL;DR: In this article, a chiral three-dimensional indium(III)-organic compound is presented, which shows interesting photoluminescent properties and notable catalytic activity on the diethylzinc addition to benzaldehyde.
Abstract: Presented here is a chiral three-dimensional indium(III)-organic compound [In(5-Aip)2]·(TPP)·4H2O (1; 5-Aip = 5-aminoisophthalate, TPP = tetraphenylphosphonium). The structure of 1 features an unusual tetrahedral anionic framework containing tetrahedral TPP guests. This compound shows interesting photoluminescent properties and notable catalytic activity on the diethylzinc addition to benzaldehyde. The results reveal that the employment of tetrahedral TPP cations as guests can not only direct the formation of a tetrahedral framework but also help on the improvement of physical properties.

Journal ArticleDOI
TL;DR: In this article, two bis(5,6-dimethybenzimidazole)-based CoII complexes, Co(pydca)(L)2·2H2O (1) and [Co(bdc)(L)] n 2 O (2) were synthesized and characterized by physicochemical, spectroscopic methods and single-crystal diffraction.
Abstract: Two new bis(5,6-dimethybenzimidazole)-based CoII complexes, Co(pydca)(L)2·2H2O (1) and [Co(bdc)(L)] n (2) (L = 1,3-bis(5,6-dimethylbenzimidazol-1-yl)-2-propanol, H2pydca = pyridine-2,6-dicarboxylic acid, H2bdc = 1,4-benzenedicarboxylic acid) were synthesized and characterized by physicochemical, spectroscopic methods and single-crystal diffraction. The cobalt(II) centers display different environments with distorted square-pyramidal geometry in 1 and a perfect tetrahedral geometry in 2. Complex 1 is a mononuclear structure, which is further assembled into a 3D supramolecular network via strong hydrogen bonding as well as π–π interactions; while complex 2 possesses a 2D corrugated (4,4) network that is further formed into a (3,4,4)-connected network with (62.84)(63)2(64.82)2-3,4,4T25 topology due to classical hydrogen bonds. The fluorescence and catalytic performances of the two complexes for the degradation of methyl orange by sodium persulfate have been investigated.

Journal ArticleDOI
TL;DR: In this paper, the synthesis of the zinc(II) complex of p-coumaric acid is described. But the zinc complex was characterized by infrared spectroscopy and 1H and 13C NMR spectra.
Abstract: The synthesis of the zinc(II) complex of p-coumaric acid is described. The chemical formula of the complex as obtained from the single-crystal X-ray analysis is [Zn4(C9H7O3)8(H2O)6]·4(H2O). The compound crystallizes in the triclinic space group P-1 with one molecule in the unit cell. There are two crystallographically independent Zn(II) cations in the structure. Zn1 is six-coordinate to three different carboxylate oxygens and three waters in a distorted octahedral geometry, whereas Zn2 ions are connected to four oxygens from four p-coumarate anions resulting in tetrahedral geometry. Adjacent cations are connected by bridging carboxylates to form centrosymmetric tetranuclear aggregates. Adjacent molecules are connected by a net of strong O–H O hydrogen bonds into a 3D supramolecular framework with 1D open channels filled with water molecules. The zinc complex was characterized by infrared spectroscopy and 1H and 13C NMR spectra. The antimicrobial activities of zinc p-coumarate toward Bacillus subtilis, Can...

Journal ArticleDOI
TL;DR: Two new mononuclear Cu(I) complexes based on 2-(2'-pyridyl)benzimidazolyl derivative ligand containing hole-transporting carbazole and PPh3 exhibit weak MLCT absorption bands ranging from 360 to 480 nm, and display strong orange phosphorescence in the solid states at room temperature, which is completely quenched in solutions.

Journal ArticleDOI
TL;DR: The origin of the enantioselectivity in the [Cu(R,R)-Ph-box](OTf)2-catalyzed intramolecular aminooxygenation of N-sulfonyl-2-allylanilines and 4-pentenylsulfonamides to afford chiral indolines and pyrrolidines was investigated using density functional theory (DFT) calculations.
Abstract: The origin of enantioselectivity in the [Cu(R,R)-Ph-box](OTf)2-catalyzed intramolecular aminooxygenation of N-sulfonyl-2-allylanilines and 4-pentenylsulfonamides to afford chiral indolines and pyrrolidines, respectively, was investigated using Density Functional Theory (DFT) calculations. The pyrrolidine-forming transition state model for the major enantiomer involves a chair-like seven-membered cyclization transition state with a distorted square planar copper center, while the transition state model for the minor enantiomer was found to have a boat-like cyclization geometry having a distorted tetrahedral geometry about the copper center. Similar copper-geometry trends were observed in the chiral indoline-forming reactions. These models were found to be qualitatively consistent with experimental results and allowed for rationalization of how substitution of the substrate backbone and N sulfonyl substituent affected the level of enantioselectivity in these and related copper(II)-catalyzed enantioselective reactions.

Journal ArticleDOI
TL;DR: Since B(OR)2-smaragdyrin complexes are electron rich due to the presence of electron rich alkoxy and aryloxy groups, the B( OR)2/2/3/4/5/6 complexes are easier to oxidize but difficult to reduce compared to BF2- smaragDyrin.
Abstract: A series of B(OR)2-smaragdyrin complexes were synthesized by treating BF2-smaragdyrin complex with various aliphatic and aromatic alcohols in the presence of AlCl3 in CH2Cl2 at room temperature. The compounds are stable and characterized by various spectroscopic and electrochemical techniques. The X-ray structure solved for one of the B(OR)2-smaragdyrin complex showed that the macrocycle is planar and the boron atom is in tetrahedral geometry coordinated to two pyrrole nitrogens of the macrocycle and two oxygen atoms of the axial –OR groups. 1H NMR studies indicated that the alkoxy or aryloxy groups present on the boron atom experience the macrocyclic ring current effect and appear in the up-field region. The absorption properties of B(OR)2-smaragdyrin complexes showed a strong absorption band at ∼700 nm along with other absorption bands in the 450–650 nm region like BF2-smaragdyrin complex. Since B(OR)2-smaragdyrin complexes are electron rich due to the presence of electron rich alkoxy and aryloxy groups, the B(OR)2-smaragdyrin complexes are easier to oxidize but difficult to reduce compared to BF2-smaragdyrin. The B(OR)2-smaragdyrin complexes are found to be weakly fluorescent than BF2-smaragdyrin.

Journal ArticleDOI
TL;DR: A series of 2H-benzoimidazol-2-yl)quinolin-8-ol ligands and their Zn(II) complexes were synthesized and characterized by spectroscopic and elemental analyses as discussed by the authors.

Journal ArticleDOI
TL;DR: The aim of the present work is to show how extended X-ray absorption fine structure (EXAFS) spectra of these complexes, having different types of coordination environment, can be analyzed to yield the coordination geometry around one type of copper centers present in complexes 1 and 3, and two types of copper center present incomplex 2 and 4.
Abstract: X-ray absorption fine structure spectra of five copper(I) thiourea complexes [Cu4(thu)6 (NO3)4 (H2O)4] (1), [Cu4(thu)9 (NO3)4 (H2O)4] (2), [Cu2(thu)6 (SO4) H2O] (3), [Cu2(thu)5 (SO4) (H2O)3] (4), and [Cu(thu)Cl 0.5H2O] (5) have been investigated. Complexes 1 and 3 are supposed to have one type of copper centers in trigonal planar and tetrahedral environment, respectively. Complexes 2 and 4 are supposed to have two types of copper centers, one center having trigonal planar geometry and another center having tetrahedral geometry. The aim of the present work is to show how extended X-ray absorption fine structure (EXAFS) spectra of these complexes, having different types of coordination environment, can be analyzed to yield the coordination geometry around one type of copper centers present in complexes 1 and 3, and two types of copper centers present in complexes 2 and 4. The crystal structure of complex 5 is unavailable due to inability of growing its single crystals, and hence the coordination geometry of this complex has been determined from EXAFS. The structural parameters determined from the EXAFS spectra have been reported and the coordination geometry has been depicted for the metal centers present in all the five complexes. Also, the chemical shifts have been used to determine the oxidation state of copper in these complexes. The X-ray absorption near edge spectra features have also been correlated with the coordination geometry. Also, the presence of both three and four coordinated Cu(I) centers in complexes 2 and 4 has been suggested from a comparison of the intensity of the feature at 8984 eV with those of 1 and 3. Further, in case of complex 5, the high intensity of peak A at 8986.5 eV is found to correspond to the presence of Cl coordinated to the copper center.

Journal ArticleDOI
TL;DR: By condensation of amantadine and 4-methoxysalicylaldehyde a Schiff base HL was synthesized as mentioned in this paper, and the two complexes were characterized by IR, 1H NMR, elemental analysis, molar conductance, and single-crystal X-ray diffraction.
Abstract: By condensation of amantadine and 4-methoxysalicylaldehyde a new Schiff base HL was synthesized A mixture of HL and zinc(II) chloride in an alcoholic medium leads to [Zn(HL)2Cl2] (1) However, the same reactants gave another different complex (ZnL2) (2) in the presence of NaOH The two complexes were characterized by IR, 1H NMR, elemental analysis, molar conductance, and single-crystal X-ray diffraction X-ray diffraction analysis reveals that complex 1 crystallizes in the triclinic system, Pī space group; each asymmetric unit consists of one zinc(II), two HL, and two chlorides The tetra coordination of central zinc is attained by two chlorides and two oxygens from the Schiff base, forming a distorted tetrahedral geometry Complex 2 crystallizes in the monoclinic system, P21/c space group; each asymmetric unit consists of one zinc(II) and two L The tetra coordination of central zinc is attained by two nitrogens and two oxygens from the Schiff base, forming a distorted tetrahedral geometry

Journal ArticleDOI
TL;DR: In this paper, the synthesis and structural characterization, and luminescence properties of two new four-coordinate gold(I) complexes containing the monodentate tri-2-furly phosphine is described.

Journal ArticleDOI
Wei-Xia Zhou1, Bing Yin1, Jun Li1, Wan-jun Sun1, Feng-Xing Zhang1 
TL;DR: In this paper, two new Cu(I) complexes, [CuI(MBT)2]2 (1) and [cuI(BBTM)]2 (2) (BBTM = 2,2′-thiobis(benzothiazole)) were solvothermally synthesized in a one pot reaction with 2-mercaptobenzothiazoles (MBT), and a hypothetical reaction mechanism was elucidated for the formation of complexes 1 and 2.

Journal ArticleDOI
TL;DR: In this article, a cadmium(II) complex dicyanidobis(N, N,N′-dimethylthiourea-S) was constructed and its structure in the solid state was determined by single crystal X-ray structural analysis.
Abstract: A cadmium(II) complex dicyanidobis(N,N′-dimethylthiourea-S) cadmium(II) [Cd(Dmtu)2(CN)2] (1) is prepared and its structure in the solid state is determined by single crystal X-ray structural analysis. The cadmium(II) ion is four-coordinate having a distorted tetrahedral geometry composed of two cyanide C atoms and two thione S atoms of N,N′-dimethylthiourea (dmtu). The molecular structure is stabilized by intermolecular N-H…N(CN) hydrogen bonding interactions that lead to a 3D network structure. The complex was also characterized by IR and NMR spectroscopy.

Journal ArticleDOI
TL;DR: In this paper, a dimeric aluminum complex bridged by alkoxide with pendant aniline group was synthesized and characterized, and X-ray analysis revealed that the two four-coordinate aluminum centers possess a distorted tetrahedral geometry with C2h symmetry.

Journal Article
TL;DR: In this paper, a Schiff base ligand, 2-((1H-benzo[d]imidazol-4-ylimino)methyl)phenol and its metal complexes were synthesized from 1Hbenzo [d] imidazole-4amine and 2-hydroxy benzaldehyde.
Abstract: The purpose of this work is synthesis of novel Schiff base ligand, 2-((1H-benzo[d]imidazol-4-ylimino)methyl)phenol and its metal complexes from 1H-benzo[d] imidazole-4-amine and 2-hydroxy benzaldehyde. Nickel and Copper being essential trace elements have given considerable attention for the synthesis of metal complexes. They have been characterized by elemental analysis and spectral techniques like IR, 1HNMR and mass spectrometry. The spectral studies of the complexes reveal that the ligand has coordination through the O and N atoms of the ligand. Cell dimensions a(13.554540 A), b(9.496137 A), c(4.471746 A), α(90.000), β(90.000) and γ(90.000) for Nickel complex and a(22.094890 A), b(8.983012 A), c(8.483077 A), α(90.000), β(90.000) and γ(90.000) for Copper complex are in good agreement with Orthorhombic crystal systems for both. The molecular structure of the complexes has been optimized by MM2 calculation and suggested tetrahedral geometry with sp3 hybridisation of copper and square planar geometry with dsp2 hybridization of nickel complex respectively.