Showing papers in "Synthesis and Reactivity in Inorganic Metal-organic and Nano-metal Chemistry in 1992"
TL;DR: Sulfamethoxazole has been shown to form monobasic bidentate ligand, binding the metal ion through deprotonated sulfonamide nitrogen and sulfonyl oxygen.
Abstract: Sulfamethoxazole has been shown to form complexes with Cr(III), Mn(II), Fe(III), Ni(II), Cu(II) and Zn(II). The solid complexes isolated were characterized by conductivity measurement, elemental analysis and magnetic, spectral (UV-Visible, IR, and 1H NMR) and thermal studies. Sulfamethoxazole behaves as a monobasic bidentate ligand, binding the metal ion through deprotonated sulfonamide nitrogen and sulfonyl oxygen or isoxazole ring nitrogen.
32 citations
TL;DR: In this paper, the properties of thiosemicarbazones of methyln-hexylketone and methyl-n-pentyl ketone have been characterized by elemental analyses, magnetic moments, and electronic spectral studies.
Abstract: Pd(II), Pt(II), Rh(III), Ir(III) and Ru(III) complexes of thiosemicarbazones of methyl-n-hexylketone and methyl-n-pentylketone have been prepared and characterised by elemental analyses, magnetic moments, i.r. and electronic spectral studies. These complexes were found to have the compositions M(ligand)2Cl2 (M = Pd or Pt) and M(ligand)3Cl3 (M = Rh, Ir and Ru). All the complexes are diamagnetic except Ru(ligand) 3C13. The Pd(II) and Pt(II) complexes are of square planar geometry. Rh(III), Ru(III) and Ir(III) complexes are six-coordinate octahedral. Various ligand field parameters have been calculated and discussed.
24 citations
TL;DR: Pentacoordinate cationic complexes of the types [R3SbL′2]Y2(I) and [R 3Sb(L-L))Y 2(II), (where R = CH3, C6H5 and P-CH3C6H4 L′ = DMSO, TPAO and TPPO; L-L = bipy and en; Y = BF4 or BPh4) have been synthesized and characterized by elemental analysis as mentioned in this paper.
Abstract: Pentacoordinate cationic complexes of the types [R3SbL′2]Y2(I) and [R3Sb(L-L))Y2(II), (where R = CH3, C6H5 and P-CH3C6H4 L′ = DMSO, TPAO and TPPO; L-L = bipy and en; Y = BF4 or BPh4) have been synthesized and characterized by elemental analysis. IR and 1H n. m. r. spectral data and conductance measurements. IR data in dichloromethane suggest the absence of dissociation of complex cations. Spectroscopic data conform to the requirement of trigonal bipyramidal configuration for the complex cations.
18 citations
TL;DR: In this paper, an octahedral structure is proposed for the Co(HIPT)Cl.2H2O complex on the basis of spectra and magnetic studies.
Abstract: Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and UO2 2+complexes of isatin 4(2-pyridyl)-3-hiosemicarbazone, H2IPT, have been synthesed and characterized by elemental analyses, molar conductance, spectral (i.r., visible and n. m. r.) and magnetic moment measurements. I. r. spectra show that H2IPT behaves as a bidentate (ON or SN) end a tridentate ONS in a neutral or anionic form. An octahedral structure is proposed Co(HIPT)Cl.3H2O, Co(HIPT)2. 2H2 O, Si(HIPT)Ac.2H2 0 and Cu(H2IPT)2 (Ac)2 complexes and square-planar structure for the Cu(HIPT)Cl.2H2O complex on the basis of spectra and magnetic studies. The molar conductivities for all complexes were in the range of non-electrolytes.
17 citations
TL;DR: In this article, a high yield synthesis of bis(n3-allyl)-μ-dichlorodipalladium(ll) in aqueous solution was reported.
Abstract: A high yield synthesis of bis(n3-allyl)-μ-dichlorodipalladium(ll) in aqueous solution is reported. The reaction of K2PdCI4 with allyl chloride in water gave bis(n3-allyl)-μ-dichiorodipalladium(ll) in over 90% yield.
15 citations
TL;DR: In this paper, the synthesis and structural features of some trimethyl-and triphenyl-silicon(IV) complexes with monofuctional bidentate semicarbazones derived by the condensation of 2-acetylfuran, 2-acetylthiophene, 2acetylpyridine or 2-naphthalene with semicarazide hydrochloride are described.
Abstract: The synthesis and structural features of some trimethyl- and triphenylsilicon(IV) complexes with monofuctional bidentate semicarbazones derived by the condensation of 2-acetylfuran, 2-acetylthiophene, 2-acetylpyridine or 2-acetylnaphthalene with semicarbazide hydrochloride are described. The products Me3Si(L) and Ph3Si(L) were obtained by the 1:1 stoichiometric interactions of trimethylchlorosilane and triphenylchlorosilane with sodium salts of oxygen donor ligands, (HL), in anhydrous methanol. The penta-coordinated environment around silicon(IV) is proposed on the basis of IR, 1H NMR and 13C NMR spectral studies, molecular weight determinations and conductance measurements.
13 citations
TL;DR: A series of lanthanide(III) complexes of the compositions M(HL)3 (M=La, Pr, Nd, Sm, Dy and Y; H2L = 2- thenoyltrifluoroacetone isonicotinoyl hydazone) and M( HL)L (M = Er and Yb) have been synthesized and characterized by elemental analyses, conductance measurements, IR, 1H NMR and electral data and thermal analyses as discussed by the authors.
Abstract: A series of lanthanide(III) complexes of the compositions M(HL)3 (M=La, Pr, Nd, Sm, Dy and Y; H2L = 2- thenoyltrifluoroacetone isonicotinoyl hydazone) and M(HL)L (M = Er and Yb) have been synthesized and characterized by elemental analyses, conductance measurements, IR, 1H NMR and electral data and thermal analyses. The ligand can coordinate as mono- and di-anions.
13 citations
TL;DR: Some novel Raixed-ligand cyanonitrosyl {CrN0}5 chromium(I) hetero complexes have been synthesized and characterized on the basis of elemental analyses, electrical conductances, thermogravimetric analyses, infra-red and electron spin resonance spectra and magnetic susceptibility measurements as mentioned in this paper.
Abstract: Some novel raixed-ligand cyanonitrosyl {CrN0}5 chromium(I) hetero complexes of the types [cr (NO) (CN)2 (L)2 (H2O)] (where L = 2-(2′-hydroxyphenyl)benzothiazole and [Cr(NO) (CN)2 (L-L) (H2O)] (where L-L = 2-(2′ -pyridy)benzothiazole, 2-(6′-methy1–2′-pyridyl) benzothiazole, 2-(2′-aminophenyl)benzothiazole or 2-(3′-aminophenyl)-benzothiazole) have been synthesized and characterized on the basis of elemental analyses, electrical conductances, thermogravimetric analyses, infra-red and electron spin resonance spectra and magnetic susceptibility measurements The complexes exhibit magnetic moments in the range 170–175 B M at room temperature, give a positive Griess reagent test and behave as non-electrolytes Suitable octahedral structures have been suggested for the complexes
12 citations
TL;DR: In this article, a progressive trend towards lower frequency was observed in the characteristic ν(X-O) frequency (X = N, P, S and As) whilst the ν (Sb-O)-frequency showed a trend towards higher frequency on complexation depending upon the nature of the organic R group bound to Sb.
Abstract: Triorganoantimony(V) cations of the types [R3SbL2]+2 (I),[R3SbL′]+2 (II) and [R3SbL″]+1 (III), where R=CH3, C6H5,p-CH3C6H4, p-C1C6H4, p-FC6H4 and C6F5: L = TU, HMPA, PyO, DMSO; TPPO, TPAO; L′ = bipy and en and L″ = acac, have been isolated in combination of balancing C1O4. anion(s) and characterized by elemental analyses, molar conductance measurements/ IR and 1H n.m.r. spectral data. In the solid state IR spectra, a progressive trend towards lower frequency was observed in the characteristic ν(X-O) frequency (X = N, P, S and As) whilst the ν(Sb-O) frequency showed trend towards higher frequency on complexation depending upon the nature of the organic R group bound to Sb. The complexes [R3SbL2] [ClO4]2 and [R3SbL′] [C1O4]2 behave as 1:2 electrolytes whereas [R3SbL″][ClO4] acts as 1:1 electrolyte. IR spectra in dichloromethane suggest the absence of dissociation of these complex cations. Spectroscopic data and solution phase studies conform to the requirement of a trigonal bipyramidal configuratio...
10 citations
TL;DR: In this paper, the complexes Ln(HL)2Cl3.3H2O or Ln-(HL)3(SCN)32H 2O (Ln = lanthanide) have been characterised by IR and UV spectroscopy, molar conductance, TG and DSC analyses.
Abstract: Acetone ferrocenecarbonylhydrazone, HL, reacts with hydrated lanthanide chlorides or thiocyanates in absolute EtOH to give the complexes Ln(HL)2Cl3.3H2O or Ln-(HL)3(SCN)32H2O (Ln = lanthanide), which, have: been characterised by IR and UV spectroscopy, molar conductance, TG and DSC analyses.
10 citations
TL;DR: The ammonium salt of the above anion has been isolated in the crystalline form as [(NH4)9CuW17O57F5H5].8H2O] as discussed by the authors.
Abstract: The ammonium salt of the above anion has been isolated in the crystalline form as [(NH4)9CuW17O57F5H5].8H2O. Evidence from chemical analysis, x-ray powder pattern, spectroscopy (vis., I. R.), and fast atom bombardment mass spectroscopy, indicates that the anion has the Dawson-Wells structure. A Cu(II) ion replaces one W+6 of the eighteen tungsten in the original Dawson structure. The anion has been shown to have good in vitro anti-viral activity.
TL;DR: In this article, a mixture of 3, 5-dimethyl pyrazol-l-yl (3BH)borates and hydridotris (HgQ) has been characterized and shown to contain two-coordinated mercury.
Abstract: Organyl-mercury hydridotris(3, 5-dimethylpyrazol-l-yl)borates have been prepared and characterized; solution data (1H, 13C and 199Hg NMR spectra) indicate that the R-HgQ compounds (R = alkyl, aryl, ferrocenyl; Q = [(3, 5-dimethylpyrazol-l-yl)3BH]−) are fluxional and are likely to contain two-coordinated mercury(II).
TL;DR: In this article, a new vicinal dioxiroe ligand with two 2-benzimidazolylmethyl groups, namely S,S′-bis(2-benzinimidezolylroethyl)dithioglyoxime (H2L), has been prepared from cyanogen-di-N-oxide and 2-mercaptomethylbenz-imidrazole in dichloromethane at -10°C.
Abstract: A new vicinal dioxiroe ligand with two 2-benzimidazolylmethyl groups, namely S,S′-bis(2-benzimidazolylroethyl)dithioglyoxime (H2L), has been prepared from cyanogen-di-N-oxide and 2-mercaptomethylbenz-imidazole in dichloromethane at -10°C. Nickel(II), palladium(II), cobalt(II) and cobalt(III) complexes of H2L have a metal : ligand ratio of 1 : 2 and the ligand coordinates through the two N atoms, as most of the vicinal dioximes. [Co(HL)2(L′)Cl] has been prepared with L′ = pyridine, 2,6-dimethylpyridine, 2-mercaptopyridine, 2-car-boxypyridine, pyridine-2-carboxyaldehyde, triphenylphosphine, tri-phenylarsine, together with a chloride ion as axial ligands. All these complexes are slightly soluble in common organic solvents. Structures are proposed according to elemental analyses, 1H, 13C-NMR IR, and UV-Visible spectral data.
TL;DR: In this article, five new complexes of cobalt(II) with diphenyl pyraline hydrochloride (DPH) were synthesized and characterized on the basis of elemental analysis, molar conductance, magnetic susceptibility measurements, TGA, IR, 1H NMR and electronic absorption spectra.
Abstract: Five new complexes of cobalt(II) with diphenyl pyraline hydrochloride (DPH) are synthesized and characterized on the basis of elemental analysis, molar conductance, magnetic susceptibility measurements, TGA, IR, 1H NMR and electronic absorption spectra. The molecular structure of [Co(DPH)2(H20)2cl2] complex is investigated by X-ray diffraction. This complex was screened for its fungicidal activity on A. alternaria alternata at 0.1, 0.2 and 0.3%.
TL;DR: In this paper, the synthesis and characterization of Fe(III), Co(III, Co(II), Ni (II), Cu (II, Zn), Cd (II) and UOc complexes of bis(biacetylmonoxime) carbohydrazone (H3BMC) are reported.
Abstract: The synthesis and characterization of Fe(III), Co(III), Co(II), Ni (II), Cu (II), Zn (II), Cd (II) and UOc complexes of bis(biacetylmonoxime) carbohydrazone (H3BMC) are reported. Elemental analyses, molar conductance, magnetic moment and spectral (i. r., visible and n. m. r) measurements have been used to characterize the complexes. I. r. spectral data show that the ligand behaves in a tetradentate and/or pentadentate manner. The behaviour of the ligand towards any metal ion depends on the type of anion and the preparative conditions. An octahedral structure is proposed for the Fe (III), Co (III), Co (II) and the Ni (II) complexes which were prepared from the chloride, bromide, nitrate or sulphate salts. A square-planar structure is proposed for Cu (II) and the Ni (II) complexes derived from the acetate and thiocyanate salts on the basis of magnetic and spectral measurements. H3BMC acts as an oxidizing agent towards Co (II) chloride forming a diamagnetic Co (III) complex. All the complexes are no...
TL;DR: In this paper, a series of N-monohalogermyl secondary amines of the type R2Ge(X)NHR' (R= Me, Et, Ph; R'= Mes, tBu3C6H2; X= Cl, F) stabilized by steric hindrance was synthesized.
Abstract: Within a general study of new precursors of germa-imines, a series of N-monohalogermyl secondary amines of the type R2Ge(X)NHR' (R= Me, Et, Ph; R'= Mes, tBu3C6H2; X= Cl, F) stabilized by steric hindrance was synthesized. These compounds were obtained through aminolysis of germanium-halogen bonds by primary amines or by lithium derivatives of these primary amines. The halogermylamines thus formed are thermally unstable and decompose by symmetrisation leading principally to the corresponding dihalogermanes. Methanoly-sis of the Ge-N bond leads to the corresponding halomethoxygermanium compounds. Abstraction of hydrogen halide leads to the expected transient germa-imine or to the corresponding dimer: the sterically hindered cyclodigermazane not obtainable by other methods. Cleavage reactions of sterically hindered cyclodigermazanes by Et3N, HCl does not lead to halogermyl secondary amines but to bis-(diorganohalogermyl) tertiary amines.
TL;DR: In this article, the coordination geometry of metal ion in Nd(III) haloacetates both in crystalline and in non-aqueous (DMF, Methanol, Mixture of Isobutanol-DMF equimolar binary mixtures) solvents was studied.
Abstract: Neodymium(III) haloacetates (monochloro-, dichloro-, trichloro- and trifluoro acetates) gave 1:3 adducts with alcohols, while yield mixed solvato complexes with dimethyl formamide and dimethyl sulphoxide of the type Nd(solv)x (OOCR)3 where x = 4 or 6 depending upon the time given for the reaction. Absorption difference and comparative absorption spectrophotometry were used to study the coordination geometry of metal ion in Nd(III) haloacetates both in crystalline and in non-aqueous (DMF, Methanol, Methanol-DMF, and Isobutanol-DMF equimolar binary mixtures) solvents. The computed values of spectral parameters and the variation of these parameters were used to supplement comparative absorption study. The transitions 4I9/2→4G7/2, 4F7/2, 4F5/2 and 4F3/2 and which have generally been regarded almost linsensitive towards coordination environment, have been found tp be substantially sensitive and thus been referred to as Pseudohypersensitive transitions and observation has been given the name “Ligand Me...
TL;DR: Bis(methylene)sila- (and germa-)cycloalkanes, interesting syn-thons in organometallic chemistry, can be obtained in one step from silicon and germanium halides.
Abstract: Bis(methylene)sila- (and germa-)cycloalkanes, interesting syn-thons in organometallic chemistry, can be obtained in one step from silicon and germanium halides. However, good yields are only obtained by using suitable experimental conditions (concentrated solutions, reflux temperature, excess of one reagent).
TL;DR: In this paper, the pyrimidine and thiazolium portions of the thiamin molecule must remain intact for the copper(II) complexes to undergo reduction both in water and in methanol.
Abstract: Copper (II) complexes of vitamin B1. analogues (L1), CuL1Xn (X = Cl, Br, I, SCN; n = 2 or 3) and CuL1(CH3C00)C104, and those of structurally related ligands, L2 - L7 (Fig.2) were isolated and their properties investigated. Reactions of Cu2(CH3C00).-2H20 with vitamin B1 and the bromo, iodo and thiocyanato analogues in aqueous medium resulted in copper(I) complexes, CuThX2 (X = Cl, Br, I, SCN). Parallel reactions carried out in methanol using thiamin and its analogues afforded both copper(I) and copper(II) complexes, depending on the duration of reaction. CuL1 Cl3 converted to the copper(I) complex on prolonged ( 3 months) storage. In contrast all the structurally related ligands (L2 - L7) yielded stable copper(II) complexes. Thus, it appears that for the copper(II) complexes to undergo reduction both the pyrimidine and the thiazolium portions of the thiamin molecule must remain intact. The reduction process is faster in water but slow enough in methanol to afford the isolation of the copper(II) c...
TL;DR: A series of 16 mixed ligand complexes of Th(IV) and UO2 (VI) with 4-benzoyl-3-methyl-l-phenylpyrazol-5-one(BMPP) and different anions such as nitrate, sulphate, thiocyanate and oxalate have been synthesized and characterized on the basis of elemental analysis, molecular weight, molar conductance and IR spectral data.
Abstract: A series of 16 mixed ligand complexes of Th(IV) and UO2 (VI) with4-benzoyl-3-methyl-l-phenylpyrazol-5-one(BMPP)and different anions such as nitrate, sulphate, thiocyanate, thiosulphate, acetate, propionate, malonate and oxalate have been synthesized and characterized on the basis of elemental analysis, molecular weight, molar conductance and IR spectral data. These complexes have the general formulae [Th(BMPP)2(AA)2],[UO2(BMPP)2(AA)],[Th(BMPP)2(A)4]and (U02(BMPP)2(A)2], where AA = divalent anions and A = monovalent anions. In these complexes BMPP acts as a neutral bidentate ligand bonding through both the carbonyl groups, the monovalent anions, viz., nitrate, thiocyanate, acetate and propionate act as unidentate ligands, and the divalent anions, viz., sulphate, thiosulphate, malonate, and oxalate act as bidentate ligands.
TL;DR: Ruthenium(II) chloride complexes, [Ru(L-L)(L′)2 Cl2], where L-L = N,N,N′, N′-tetramethylethylenediamine (N-N), 1-(thiomethyl)-2-(diphenylarsino)ethane (S-As), N-methyl-2-thiophenealdimine (S -N); L′ = CO or DMSO, have been prepared by the reaction of [Ru (Co)2
Abstract: Ruthenium(II) chloride complexes, [Ru(L-L)(L′)2 Cl2], where L-L = N,N,N′, N′-tetramethylethylenediamine (N-N), 1-(thiomethyl)-2-(diphenylarsino)ethane (S-As), N-methyl-2-thiophenealdimine (S-N); L′ = CO or DMSO, have been prepared by the reaction of [Ru(Co)2Cl2]n or [Ru(DMSO)4Cl2] with (N-N), (S-As) or (S-N) and characterized by elemental analyses, IR and 1H-NMR spectral data.
TL;DR: In this article, a number of mixed ligand complexes of the general formulae Ba[M(acac)2 (Rdtc), [M′(ACac)n]2 (rdtc) (Rrdtc = glycinyl- or L-alaninyldithiocarbamate, acac = acetylacetonate, M = Co+2, Ni2+ or Cu2+, M′ = V02+ or Fe3+, n=l or 2) and [Co(DH)(DH2)]-(L-
Abstract: A number of mixed ligand complexes of the general formulae Ba[M(acac)2 (Rdtc)], [M′(acac)n]2 (Rdtc) (Rdtc = glycinyl- or L-alaninyldithiocarbamate, acac = acetylacetonate, M = Co+2, Ni2+ or Cu2+, M′ = V02+ or Fe3+, n=l or 2) and [Co(DH)(DH2)]-(L-alandtc) (DH=dimethylglyoximate) have been synthesised The characterisation of the compounds was achieved on the basis of elemental analyses and IR and electronic spectra; the thermal behaviour of the complexes was also studied. An octahedral structure around the central metal atoms is proposed. Vanadium(IV) and iron(III) complexes are supposed to be dimeric, with the glycinyl- and L-alaninyldithiocarbamates acting as a bridge.
TL;DR: In this article, a tetrahedral geometry for Co(epthc) and Co(cpthc), while a square-planar geometry is indicated for Ni, Ni(H), Ni(I), Cu(II), Zn(II) and Cu(CPthc); Ni(C) is shown to possess an octahedral geometry.
Abstract: 1-Aryl-2, 5-dithiohydrazodicarbonamide (aryl=ethoxyphenyl-(I) and chlorophenyl-(II)) forms 1:1 complexes of the type M(epthc) wherein M=Co(II), Ni(II), Cu(II) and Zn(II) and epthc=p-ethoxyphenyl dithiohydrazodicarbonamide; M(cpthc) M=Co(II), Cu(II) and Zn(II) and M(cpthc). 2H2O (M=Ni(H)) and cpthc=p-chlorophenyldithiohydrazodicarbonamide. Magnetic and electronic spectral studies suggest tetrahedral geometry for Co(epthc) and Co(cpthc) while a square-planar geometry is indicated for Ni(epthc), Cu(epthc) and Cu(cpthc); Ni(cpthc). 2H2O is shown to possess an octahedral geometry. Infrared spectra ascertain a binegative tetradentate behaviour of the ligands and the bonding sites are both hydrazidic nitrogens and the thiolo-sulphur. The Co(II), Ni(II) and Cu(II) complexes and ligands (I, II) have been found to exhibit pronounced antifungal activity against H. oryzae and A. flavus. The antibacterial properties of all the metal complexes and the ligands towards Bacillus-subtilis, Proteus microbilis and E...
TL;DR: In this article, the preparation and characterisation of a series of new coordination compounds of Mn(II), Fe(III), Co(II, Ni(II) and Cu(II)) containing m-aminobenzoic hydrazide and some of its arylidene derivatives are reported.
Abstract: The preparation and characterisation of a series of new coordination compounds of Mn(II), Fe(III), Co(II), Ni(II) and Cu(II) containing m-aminobenzoic hydrazide and some of its arylidene derivatives are reported. Attempts have been made to ascertain their probable structures on the basis of elemental analysis, molar conductance, TGA, ir, electronic and esr spectra as well as magnetic measurements. The ir-spectra suggest that the ligand coordinates to the metal ions via the oxygen of the carbonyl group and β-nitrogen atom.
TL;DR: A series of hitherto unreported diarylantimony(III) carboxylates of the general formula, Ar. SbOCOR (Ar=C6H5, p-CH3C 6H4 and R =CF3, CH2C1, CH 2I, β-c4H4N, ββ-C4H3O, P-CIC6H4, O-NO2C6h4, m-NO 2CH4, P -NH2C 6h4 P-NH2H4 as discussed by the authors
Abstract: A series of hitherto unreported diarylantimony(III) carboxylates of the general formula, Ar. SbOCOR (Ar=C6H5, p-CH3C6H4 and R =CF3, CH2C1, CH2I, β-c4H4N, β-C4H3O, p-CH3C6H4, O-NO2C6H4, m-NO2CH4, P-NO2C6H4, O-CIC6H4, P-CIC6H4 m-NH2C6H4 P-NH2C6H4) have been isolated and characterized by elemental analysis, IR and 1H n. m. r. spectra, conductivity, and molecular weight measurement. These carboxylates possess polymeric structure with the bridging ligand and are partially broken or completely broken in solution leading to a pyramidal structure with monodentate carboxylate moiety. Attempts to prepare ArSb(OCOR)2 were unsuccessful.
TL;DR: The reactions between T1X (X = Cl, Br, or I) and substituted imidazoles in various donor-acceptor molar ratios have been studied.
Abstract: The reactions between T1X (X = Cl, Br, or I) and substituted imidazoles [(2-methyl-imidazole (2-Me-Im), 2-phenyl-imidazole (2-Phen-Im), 2-ethyl-imidazole (2-Et-Im), 1,2-dimethyl-imidazole (1,2-Me2-Im) and l-methyl-2-phenyl-imidazole (1-Me,2-Phen-Im)] in various donor-acceptor molar ratios have been studied. The complexes formed have been characterized by elemental analysis. The complexes are monomeric solids and non-electrolytes in acetonitrile. Possible structures are discussed on the basis of H NMR and i.r. spectroscopy and comparison with structures in the literature.
TL;DR: In this paper, the synthesis and characterization of CoII, NiII, CuII and CuI complexes of 4-benzoyl-l-(2-pyridyl)-S-thiosemicarbazide (HBPyT), 4-phenyl-l.p.r.d.
Abstract: The synthesis and characterization of CoII, NiII, CuII and CuI complexes of 4-benzoyl-l-(2-pyridyl)-S-thiosemicarbazide (HBPyT), 4-phenyl-l-(2-pyridyl)-3-thiosemicarbazide (HPPyT) and 4-phenyl-1-(2-pyridyl)-3-semicarbazide (HPPyS) are reported. Elemental analyses, molar conductivities, magnetic and spectral (visible, IR) measurements have been used to characterize the complexes. The IR spectral data show that the ligands behave as mono and/or bidentate ligands. HPPyT behaves as a reducing agent towards CuII Different stereochemistries are proposed for the CoII, NiII and CuII on the basis of spectral and magnetic studies.
TL;DR: In this article, the authors showed that the halogenation of parent complexes with N-bromosuccinimide and N-chlorosculinimides caused substitution at the τ -position in the bisacetylacetylacetonering.
Abstract: Mixed ligand metal(II) complexes of the type [ML{XC(COCH3)2} (H2O)n] [M = Cu(II), Ni(II) and Zn(II); L = 2-formyl-, 2-acetyl- or 2-benzoyl- cyclohexanone; X = H, Cl, Br, CONHPh; n = 0,1,2] have been prepared and characterized by elemental analyses, magnetic measurements, infrared, 1H NMR, EPR and electronic spectral studies. The halogenation of the parent complexes with N-bromosuccinimide and N-chlorosuccinimide caused substitution at the τ -positionintheacetylacetonering. Reactionsofthe complexes with phenylisocyanate produced monoamides. The UV and IR spectra of the products and the 1H NMR spectra of the complexes are all consistent with τ-substitution. The copper(II) complexes are anhydrous and square-planar whereas thedihydratednickel(II)complexesareoctahedral. Zinc (II) complexes are monohydrated. In the mixed ligand complexes ν(C=O). is sensitive to the metal coordinated to it in contrast to that observed in bisacetylacetonates. EPRspectralstudiesofcopper(II)complexesindicatethat they are s...
TL;DR: In this article, the macrocyclic metal complexes of the composition [M(L1)]Xn (n=2 or 3) and [M[Xn]Xn n = 2 or 3] were synthesized and characterised on the basis of elemental analyses, conductance measurements, magnetic susceptibility, DSC thermograms and IR spectral data.
Abstract: Iron(III), cobalt(II) and nickel(II) macrocyclic metal complexes of the composition [M(L1)]Xn (n=2 or 3) and [M(L2)]Xn (n=2 or 3) (where TaHh-DAP - 2′,6-diacetylpyridine-3,4-diphenylthiophene-2,5-diacid dihydrazone (L1), TaHh-TDA = 3′,4′-diphenylthiophene-2′,5′-dialdehydo-3,4-diphenylthiophene-2,5-diacid dihydrazone (L1), M = iron(III) or cobalt(II) or nickel(II), X = Cl or NO3 − or OAc or SO4 −) were synthesised and characterised on the basis of elemental analyses, conductance measurements, magnetic susceptibility, DSC thermograms and IR spectral data
TL;DR: EPR spectra of oxovanadium(IV) complexes of some bidentate Schiff bases have been described in this paper, and various epr parameters and bonding coefficients have been calculated and discussed.
Abstract: EPR spectra of oxovanadium(IV) complexes of some bidentate Schiff bases have been described. Various epr parameters and bonding coefficients have been calculated and discussed.