Showing papers on "Octahedral molecular geometry published in 1996"
TL;DR: In this article, two uranyl phenylphosphonates, UO2(HO3PC6H5)2(H2O)]2·8H 2O (1) and UO 2(HO 3PC 6H5 )2·2CH3CH2OH (2), have been synthesized and their structures solved by single-crystal methods.
Abstract: Two uranyl phenylphosphonates, [UO2(HO3PC6H5)2(H2O)]2·8H2O (1) and UO2(HO3PC6H5)2·2CH3CH2OH (2), have been synthesized and their structures solved by single-crystal methods. Both compounds crystallize in the triclinic space group P1. Unit cell parameters are a = 11.724(4) A, b = 16.676(8) A, c = 11.375(2) A, α = 101.61(5)°, β = 106.76(3)°, γ = 102.57(4)°, and Z = 2 for compound 1 and a = 9.332(6) A, b = 11.48(1) A, c = 5.672(2) A, α = 98.98(6)°, β = 92.78(5)°, γ = 108.54(5)°, and Z = 1 for compound 2. In both compounds the metal to phosphonate ratio is 1:2, and they both form linear chains. Each metal atom in these structures is surrounded by four oxygens of four different phosphonate groups which take up the metal's equatorial positions. However, in compound 1 an additional oxygen of a water molecule binds to the uranium atom in the equatorial plane. This leads to a distorted pentagonal bipyramidal geometry of uranium in compound 1 and to a distorted octahedral geometry of uranium in compound 2. Adjacen...
121 citations
TL;DR: In this paper, the complex [Et4N]2[WVIO2(mnt)2] (1,2-dicyanoethylenedithiolate) has been synthesized as possible models for the tungsten cofactor of inactive red tungststen protein (RTP) and the active aldehyde ferredoxin oxidoreductase (AOR) of the hyperthermophilic archaeon Pyrococcus furiosus.
Abstract: The complex [Et4N]2[WVIO2(mnt)2] (1), [Et4N]2[WIVO(mnt)2] (2), and [Et4N]2[WVIO(S2)(mnt)2] (3) (mnt2- = 1,2-dicyanoethylenedithiolate) have been synthesized as possible models for the tungsten cofactor of inactive red tungsten protein (RTP) and the active aldehyde ferredoxin oxidoreductase (AOR) of the hyperthermophilic archaeon Pyrococcus furiosus. The [Ph4P]+ salt of the complex anion of 1·2H2O crystallizes in space group Pbcn, with a = 20.526(3) A, b = 15.791(3) A, c = 17.641(3) A, and Z = 4. The WVIO2S4 core of [Ph4P]2[WVIO2(mnt)2]·2H2O has distorted octahedral geometry with cis dioxo groups. 2 crystallizes in space group P21212, with a = 14.78(3) A, b = 30.08(2) A, c = 7.37(4) A, and Z = 4. The complex anion of 2 has a distorted square-pyramidal structure with an axial WO bond. 3 crystallizes in space group P21/a, with a = 12.238(3) A, b = 18.873(2) A, c = 15.026(2) A, β = 102.84(2)°, and Z = 4. The anion of 3 with a terminal oxo group and a dihapto disulfido ligand in an adjacent position is the fir...
99 citations
TL;DR: In this article, a regioselective formation of [60]fullerene derivatives with octahedral addition patterns is described via template activation with 9,10-dimethylanthracene Th-symmetric as well as mixed C2v-symetric hexaadducts.
90 citations
TL;DR: Molecules in which the only ligand is the more ionically bound fluorine are less affected by core distortion and have VSEPR-predicted structures.
Abstract: This paper describes a study of the topology of the electron density and its Laplacian for the molecules VF(5), VMe(5), VH(5), CrF(6), CrMe(6), CrOF(4), MoOF(4), CrO(2)F(2,) CrO(2)F(4)(2)(-) and CrOF(5)(-) all of which, except VF(5,) CrF(6), and CrOF(5)(-) have a non-VSEPR geometry. It is shown that in each case the interaction of the ligands with the metal atom core causes it to distort to a nonspherical shape. In particular, the Laplacian of the electron density reveals the formation of local concentrations of electron density in the outer shell of the core, which have a definite geometrical arrangement such as four in a tetrahedral arrangement or five in a square pyramidal or trigonal bipyramidal and six in an octahedral arrangement. Ligands that are predominately covalently bonded are found opposite regions of charge depletion between these core charge concentrations. In VH(5), VMe(5), CrOF(4), and MoOF(4), these core charge concentrations have a square pyramidal arrangement, and the regions of charge depletions have the corresponding inverse square pyramidal arrangement so that these molecules have a square pyramidal geometry rather than a trigonal prism geometry. In CrMe(6), there are five core charge concentrations with a trigonal bipyramidal arrangement so that the regions of charge depletion have a trigonal prismatic arrangement and the molecule has the corresponding trigonal prism geometry rather than an octahedral geometry. In contrast, molecules in which the only ligand is the more ionically bound fluorine are less affected by core distortion and have VSEPR-predicted structures. The unexpected bond angles in CrO(2)F(2) and the preference of CrO(2)F(4)(2)(-) for a cis structure are also discussed in terms of the pattern of core charge concentrations.
86 citations
TL;DR: The first dialkyl-substituted scandium phosphine complexes with two hydrocarbyl groups were reported in this article, showing that they are mononuclear in the solid state.
80 citations
TL;DR: In this paper, the structure of the self-assembling [Cr(bipy)(C2O4)2]− building blocks with Cu(II) and Ag(I) ions was determined.
72 citations
TL;DR: In this article, the electronic and e.s.r. spectra suggest a tetragonally distorted octahedral geometry in the solid state as well as in DMSO solution.
Abstract: CuII complexes of the [CuL2(SO4)]·nH2O and [CuL′(SO4)(H2O)2]·nH2O type, where L = benzoylhydrazine (PhCONHNH2; BH) or iso-propanone benzoylhydrazone (PhCONHN:CMe2; IBH), L′= iso-nicotinoylhydrazine (NC5H4CONHNH2; INH) or isopropanone iso-nicotinoylhydrazone (NC5H4CONHN: CMe2; IINH); n = 0–2, were prepared and characterized by elemental analyses, molar conductances, and electronic, e.s.r. and i.r. spectral measurements. The electronic and e.s.r. spectra suggest a tetragonally distorted octahedral geometry in the solid state as well as in DMSO solution. The e.s.r. data also reveal an axial symmetry for most of the complexes in the solid state and in DMSO solution at 300 and 77 K, while the complex of IBH is isotropic at 300 K. The ΔMs = 2 transition observed for this complex suggests that it is a dimer. BH and INH bond to CuII through the C-O and NH2 groups, whereas IBH and IINH bond through C-O and C-N groups.
60 citations
TL;DR: In this article, the synthesis, structure, and reaction chemistry of iron carbonyl boryl complexes are described, and an X-ray diffraction study of [Fe(CO)4(BCat*)2] (BCat* = −BO2C6H3-4t-Bu) was performed and showed significant distortions from octahedral geometry.
60 citations
TL;DR: In this article, the Diels-Alder reaction between cyclopentadiene and 3-acryloyl-1,3-oxazolin-2-one has been found to occur enantioselectively in the presence of catalytic amounts of (R )-2,2′-isopropylidene-bis(4-phenyl-2oxazoline) and magnesium perchlorate.
56 citations
TL;DR: In this article, an octahedral geometry was established for the two mutually trans PX3 ligands and the cyclopropene ligand in which they occupied equatorial positions cis to the apical oxo ligand.
52 citations
TL;DR: In this paper, an X-ray structural analysis showed that 1 consists of a discrete, asymmetric, dinuclear oxocitratovanadate(IV) complex and three neocuproinium cations.
TL;DR: A series of linear N4O2 amine phenols (H2badd, H2Brbadd and H2Clbadd) based on N,N‘-bis(3-aminopropyl)ethylenediamine (tnentn) were prepared and characterized by spectroscopic techniques as discussed by the authors.
Abstract: A new series of linear N4O2 amine phenols (H2badd, H2Brbadd, and H2Clbadd) based on N,N‘-bis(3-aminopropyl)ethylenediamine (tnentn) were prepared and characterized by spectroscopic techniques. Monocationic hexadentate metal complexes with the tnentn-based amine phenols were obtained from the reactions of Ga3+ and In3+ with the linear amine phenol in the presence of a weak base (acetate). The molecular structure of [Ga(Brbadd)]ClO4 has been determined by X-ray crystallography; crystals of [Ga(Brbadd)][ClO4] (C22H30Br2ClGaN4O6) are orthorhombic: a = 12.462(1) A, b = 21.835(2) A, c = 9.961(2) A, Z = 4, space group P212121. The structure was solved by the Patterson method and was refined by full-matrix least-squares procedures to R = 0.031 (Rw = 0.029) for 1924 reflections with I ≥ 3σ(I). The Ga3+ ion is coordinated in a distorted octahedral geometry by an N4O2 donor atom set. The four nitrogen atoms of the tetraamine backbone form the equatorial plane of the octahedron, and the two phenolate oxygen atoms ar...
TL;DR: In this article, the synthesis, spectroscopy, and structure of three Cu(II) coordination compounds of the ligands bis(imidazol-2-yl)methylaminomethane (bimam) and bis(IMIDazol)-2-lethylamine (bima) are described.
Abstract: The synthesis, spectroscopy, and structure of three Cu(II) coordination compounds of the ligands bis(imidazol-2-yl)methylaminomethane (bimam) and bis(imidazol-2-yl)methylamine (bima) are described. The ligands bimam and bima both coordinate to Cu(II) ions in a didentate fashion. In all three complexes the copper(II) ions are coordinated in a distorted octahedral geometry. In [Cu(Hbimam)Cl3]2(H2O)2 and [Cu(Hbima)Cl3]2(H2O)2 each Cu(II) ion is coordinated by two imidazole nitrogens and four chloride anions. The two mononuclear units are connected by two asymmetric chloride bridges. In [Cu(Hbimam)2Cl2]Cl2(H2O)2 the Cu(II) ion is coordinated by four imidazole nitrogens and two chloride anions. In the present complexes the amine nitrogen donor of the ligand is hydronated and not coordinated to the Cu(II) ion. [(De)hydronated is the recommended IUPAC expression to indicate loss/addition of H+.] In all three complexes strong hydrogen bonding is observed between the amine nitrogen donor(s) and the axial coordinat...
TL;DR: The spectroscopic data are consistent with the presence of Ni(II) in octahedral geometry coordinated by two histidylimidazoles and additional oxygen and/or nitrogen donors and demonstrate the important role of Ni-2 in establishing the proper Ni-1 coordination geometry.
TL;DR: In this article, a cyclic tetranuclear manganese complexes with maleate dianions as bridging ligand, of formula [Mn4(μ-C4H2O4)2(bipy)8]4+ have been prepared and characterized by elemental analysis, IR spectra, X-ray analysis and magnetic measurements.
TL;DR: In this article, the title compound, 4-(3-carboxy-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-quinolinyl)-1-piperazinium, is protonated at the terminal N atom of piperazine residue.
Abstract: In the title compound, 4-(3-carboxy-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-quinolinyl)-1- piperazinium—magnesium hexahydrate—sulfate—water(1/0.5/1/3), (C17H19FN3O3)[Mg(H2O)6]0.5SO4.3H2O, the Mg2+ ion lies on a twofold axis and adopts a nearly regular octahedral geometry. The quinolone is protonated at the terminal N atom of the piperazine residue. The H atom of the carboxylic group is hydrogen bonded to the carbonyl O atom, thus preventing the bonding of the metal to this part of the molecule.
TL;DR: New dinuclear complexes (μ-OH)[RCoIII(LE-py)]2ClO4 (R = Me, Et; LE-py = 2-[2-(2-pyridyl)ethyl]imino-3-butanone oximato) were obtained as discussed by the authors.
Abstract: New dinuclear complexes (μ-OH)[RCoIII(LE-py)]2ClO4 (R = Me, Et; LE-py = 2-[2-(2-pyridyl)ethyl]imino-3-butanone oximato) were obtained The synthesis involves the reduction of [CoIII(LE-py)2]ClO4 and the alkylation of the resulting Co(I) nucleophileThe compound with R = Me has been studied as a single crystal by X-ray crystallography Each of the two cobalt atoms has a distorted octahedral geometry The equatorial positions are occupied by the three LE-py N donors and the bridging OH group The axial positions are occupied by Me and oxime O atoms of the LE-py ligand coordinated to the other Co atom The mean Co−C value of 1970(7) A is close to the value of 1990(5) A reported for the Co−C bond in MeCo(Hdmg)2OH2
TL;DR: In this paper, a double-helical compound 2,2′:6′,2″:6.6.2.6,2,2.4.2,6.5.
Abstract: The compound 2,2′:6′,2″:6″,2‴:6‴,2″″:6″″,2″‴-sexipyridine (spy) has been synthesised in high yield by the coupling of 6-bromo-2,2′:6′,2″-terpyridine with a nickel(0) reagent, followed by demetallation of the resultant double-helical [Ni2(spy)2]4+ complex with KCN. In order to probe the effects of substitution of spy upon helication processes, the substituted compounds 4′,4″″-bis(methylsulfanyl)-2,2′:6′,2″:6″,2‴:6‴,2″″:6″″,2″‴-sexipyridine (msspy), 4′,4″″-diphenyl-2,2′:6′,2″:6″,2‴:6‴,2″″:6″″,2″‴-sexipyridine (pspy) and 4′,4″″-bis(4-tert-butylphenyl)-2,2′:6′,2″:6″,2‴:6‴,2″″:6″″,2″‴-sexipyridine (tbspy) were also prepared and studied. The reaction of each of these compounds with transition-metal ions capable of adopting an octahedral geometry results in the self-assembly of dinuclear double-helical complexes of the type [M2L2]4+[M = iron(II), cobalt(II), nickel(II), copper(II), zinc(II), cadmium(II) or mercury(II); L = spy, msspy, pspy or tbspy]; the double-helical topology of the zinc complex of pspy was confirmed by a crystal-structure analysis of the salt [Zn2(pspy)2][PF6]4·2MeCN·2H2O [space group P42212, a= 15.518(2), c= 18.443(1)A, R= 0.0638, R′= 0.0735].
TL;DR: The isocyanide ligands in both complexes contain a second coordinating group pointing away from the metal into the environment surrounding the molecules, providing the potential for polymetallic complexes containing metals in a variety of oxidation states.
Abstract: Reaction of 1,4-diisocyanobenzene or 4-isocyanobenzonitrile with trans-W(N(2))(2)(DPPE)(2) (DPPE = 1,2-bis(diphenylphosphino)ethane) produced cis-WL(2)(DPPE)(2), where L = 1,4-diisocyanobenzene or 4-isocyanobenzonitrile. cis-(CNC(6)H(4)NC)(2)W(DPPE)(2) crystallizes in the triclinic space group Po, with a = 12.848(3) A, b = 13.596(3) A, c = 19.072(3) A, alpha = 78.99(2) degrees, beta = 70.66(2) degrees, gamma = 65.26(2) degrees, V = 2849.8(11) A(3), and Z = 2. cis-(NCC(6)H(4)NC)(2)W(DPPE)(2) crystallizes in the triclinic space group Po, with a = 12.712(3) A, b = 13.700(3) A, c = 19.109(3) A, alpha = 77.91(2) degrees, beta = 70.63(2) degrees, gamma = 64.76(2) degrees, V = 2830.7(13) A(3), and Z = 2. Both compounds possess a distorted octahedral geometry about the metal center, with the two isocyanide ligands cis to one another. The isocyanide ligands are substantially bent along the CNC axis of the isocyanide group coordinated to tungsten. For the complex containing the symmetric ligand, CNC(6)H(4)NC, the mean CNC angle for the coordinated end of the isocyanide is 139.1(11) degrees, the average W-C bond length is 1.86(1) A, and the CtN bond lengths have a mean value of 1.30(2) A. These data indicate substantial back-donation from an electron-saturated tungsten atom. This is supported spectroscopically, with substantial shifts to lower wavenumbers for the C-N stretching frequencies of the coordinated isocyanide groups. Similar trends are observed in cis-(NCC(6)H(4)NC)(2)W(DPPE)(2). Both compounds contain electron-rich metals surrounded by large ligands which apparently protect the metals from atmospheric oxidation. The isocyanide ligands in both complexes contain a second coordinating group pointing away from the metal into the environment surrounding the molecules, providing the potential for polymetallic complexes containing metals in a variety of oxidation states.
TL;DR: In this paper, the geometry of these seven-coordinate complexes is discussed and the possible octahedral geometry with facially co-ordinated L2 ligands is discussed.
Abstract: The phosphinothiolate proligand PPh(C6H4SH-2)2(H2L2) reacted with a variety of precursors to give the complexes [ML22]n–(M = Mo, W or Re, n= 0; M = Fe, Ru, Os, Rh or Ir, n= 1). The crystal structure of the complex with M = Re revealed a distorted-octahedral geometry with the L2 ligands facially co-ordinated. Other precursors gave the complexes [ML22X]n–(X = Cl, M = Re, n= 0; X = NO, M = Mo, n= 1; M = Ru, n= 0; X = NR, M = Re, n= 1; X = NNMePh, M = Mo, n= 0; M = Ru, n= 1). The geometry of these seven-co-ordinate complexes is discussed. The metal(0) complexes [M(CO)3(MeCN)3](M = Mo or W) reacted with [NMe4]2[L2] to give orange [NMe4]2[ML2(CO)3] the crystal structure of which (M = Mo) showed near-octahedral geometry with facially co-ordinated L2. The complex [IrCl(CO)(PPh3)2] reacted with H2L2 to give the iridium(III) hydride [IrL2(H)(CO)(PPh3)]. Its crystal structure showed the expected octahedral geometry with the H atom presumed to be trans to a thiolate sulfur. The potentially tetradentate ligand P(C6H4SH-2)3(H3L3) reacted with precursors containing Ru, Os and Rh to give [M(HL3)2]–(M = Ru, Os or Rh) where each HL3 ligand is ligated via P and 2S with one unco-ordinated thiol group. These complexes were oxidised in air to give [M(L32)]n+(M = Ru or Os, n= 0; M = Rh, n= 1) where L32 is a hexadentate ligand formed by the coupling of two L3 through two disulfide bonds.
TL;DR: By comparison of the activation parameters with those for the en exchange of cobalt(II) ion, it has been confirmed that the kinetic chelate strain effect is attributed to the large activation enthalpy for the bidentate chelate opening and that the enthalpic effect is smaller in the case of the six- Membered tn chelate compared with the five-membered en chelate.
Abstract: Solvated cobalt(II) ions in neat 1,3-propanediamine (tn) and n-propylamine (pa) have been characterized by electronic absorption spectroscopy and extended X-ray absorption fine structure (EXAFS) spectroscopy. The equilibrium between tetrahedral and octahedral geometry for cobalt(II) ion has been observed in a neat pa solution, but not in neat diamine solutions such as tn and ethylenediamine (en). The thermodynamic parameters and equilibrium constant at 298 K for the geometrical equilibrium in pa were determined to be ΔH° = −36.1 ± 2.3 kJ mol-1, ΔS° = −163 ± 8 J mol-1 K-1, and K298 = 6.0 × 10-3 M-2, where K = [Co(pa)62+]/{[Co(pa)42+][pa]2}. The equilibrium is caused by the large entropy gain in formation of the tetrahedral cobalt(II) species. The solvent exchange of cobalt(II) ion with octahedral geometry in tn and pa solutions has been studied by the 14N NMR line-broadening method. The activation parameters and rate constants at 298 K for the solvent exchange reactions are as follows: ΔH⧧ = 49.3 ± 0.9 kJ...
TL;DR: In this paper, the effect of the bridgehead atom on the bonding properties of pyridine has been investigated using a single-crystal X-ray diffraction and singlecrystal electronic spectroscopy.
Abstract: Zinc(II) and nickel(II) complexes [M{(X(C5H4N)3}2]2+], where X(C5H4N)3 are symmetrical tripodal nitrogendonor ligands with X = CH, N or P, have been prepared and examined by single-crystal X-ray diffraction and single-crystal electronic spectroscopy. The structural studies, and the application of the angular overlap model to the spectroscopic results, confirm previous results on the bonding characteristics of pyridine and provide a unique way of establishing the effect of the bridgehead atom, X. The cations are all centrosymmetric with the ligand ‘bite’ angles N–M–N 85.2(1)–88.5(2)°, resulting in a slight trigonal distortion from octahedral geometry. The ligand fields in the three nickel compounds are very similar and the large ligand-field splitting is consistent with the rather short metal-nitrogen bond lengths. The pyridine groups act as moderately strong σ-donor and weak π-donor ligands, with no evidence of conjugation of the π system across the bridgehead atom. The crystal structure of [Ni{CH(C5H4N)3}2][NO3]2 shows the complex cation to have crystallographic symmetry such that there is one independent Ni–N interaction of 2.069(2)A. The corresponding zinc complex, isolated as its dibromide nonahydrate salt, has crystallographic 2/m symmetry with two Zn–N contacts of 2.123(5)A being shorter than the others, i.e. 2.141(3)A. In the phosphine analogue, [Zn{P(C5H4N)3}2]2+, isolated as its diperchlorate monohydrate salt, the Zn2+ cation is situated on a site of symmetry with one Zn–N distance [2.145(4)A] being shorter than the other two, 2.162(4) and 2.173(4)A. Small trigonal distortions from the ideal octahedral geometry are due to the restricted bite distances of the tripodal ligands.
TL;DR: In this paper, the crystal structures of five zinc-II halides with 1:1 and 1:2 compexes with neutral 2-pyridine-carboxylate esters have been determined.
TL;DR: Two gold(III) complexes of the hexaazamacrocyclic ligand 1,8-bis(hydroxyethyl)-1,3,6,8,10,13-hexaazacyclotetradecane (L), four-coordinate [Au(L)](ClO4)3·1/2H2O and sixcoordinate]AuCl4, were synthesized in high yield from the template condensation of ethylenediamine, formaldehyde, and ethanolamine in the presence of gold(
Abstract: Two gold(III) complexes of the hexaazamacrocyclic ligand 1,8-bis(hydroxyethyl)-1,3,6,8,10,13-hexaazacyclotetradecane (L), four-coordinate [Au(L)](ClO4)3·1/2H2O and six-coordinate [Au(L)Cl2]AuCl4, were synthesized in high yield from the template condensation of ethylenediamine, formaldehyde, and ethanolamine in the presence of gold(III) ion. The gold(III) template cyclization is extremely fast compared with the corresponding nickel(II) template reaction. Both gold(III) complexes are diamagnetic. [Au(L)Cl2]AuCl4 (Au2C12H30N6O2Cl6) crystallizes in the monoclinic space group P21/c with a = 6.987(2) A, b = 14.945(1) A, c = 11.151(3) A, β = 98.83(1)°, and Z = 2. The structure was solved by Patterson and the direct methods and refined to R values of R = 0.0868 and Rw(F2) = 0.1324 for 2025 observed reflections measured with Mo Kα radiation on an Enraf Nonius CAD-4 diffractometer. The gold(III) ion of the macrocyclic cation displays a tetragonally distorted octahedral geometry, with four nitrogens in the plane and...
TL;DR: Several new complexes of dioxomolybdenum (VI) of the general formula [MoO2(L)S], whereL is the dianion of salicylaldehydep-hydroxybenzoylhydrazone andS denotes H2O, MeOH, py, PPh3, DMSO or DMF, were synthesized and characterized by elemental analysis, electronic UV-VIS and IR spectra, thermal analysis, molar conductivity and magnetic susceptibility measurements as mentioned in this paper.
Abstract: Several new complexes of dioxomolybdenum(VI) of the general formula [MoO2(L)S], whereL is the dianion of salicylaldehydep-hydroxybenzoylhydrazone andS denotes H2O, MeOH, py, PPh3, DMSO or DMF, were synthesized and characterized by elemental analysis, electronic UV-VIS and IR spectra, thermal analysis, molar conductivity and magnetic susceptibility measurements. Salicylaldehydep-hydroxybenzoylhydrazone participates in the coordination as a tridentate ligand with the ONO set of donor atoms. The complexes contain acis-MoO2 group and are of octahedral geometry. Complexes of the MoO2L type were also prepared by synthesis in CHCl3 solution and by isothermal heating of [MoO2(L)S] complexes. The MoO2L complex synthesized in CHCl3 solution has most probably a pentacoordinated structure while the complex obtained by isothermal heating of [MoO2(L)S] has a polymeric hexacoordinated structure.
TL;DR: In this article, the structure of the macrocyclic complex [Cu2L(MeCN)2][F3CSO3]4·2 MeCN has been characterized, where the copper ions adopt a highly distorted five-coordinate geometry and relax to a more regular octahedral geometry on incorporation of a bridging substrate.
TL;DR: In this article, a series of neutral complexes derived from the reactions of Sn(NCS) 4, PhSn(NCCS) 3 and R 2 Sn( NCS) 2 (R = Me and Ph) with [1]-(4-methylphenylimino)methyl]-2-phenol] have been synthesized.
TL;DR: In this article, the authors performed a neutron diffraction study on the third row transition metal hexafluorides MF6 (M≡W, Os, Pt) using the high resolution neutron powder diffractometer (HRPD) at the spallation source ISIS, England.
Abstract: A neutron diffraction study on the third‐row transition metal hexafluorides MF6 (M≡W, Os, Pt) has been performed using the high resolution neutron powder diffractometer (HRPD) at the spallation source ISIS, England. The previously unknown structures of the low‐temperature phases of OsF6 and PtF6 are reported. WF6, OsF6, and PtF6, which exhibit a (5dt2g)0, (5dt2g)2, and (5dt2g)4 electronic configuration, respectively, are found to be isostructural and crystallize in the UF6 structure, space group Pmnb, (No. 62). The geometry of the MF6 molecules is to good approximation octahedral for each compound, the mean M–F bond length increasing only slightly from 182.5 (W) to 185.0 (Pt). For WF6 deviations from ideal octahedral geometry are only marginally significant [181.8(2) to 183.2(2) pm] and may be interpreted on the basis of packing effects. Deviations for the d2 complex OsF6 are somewhat larger [181.5(2) to 184.4(3) pm] and may be assumed to be caused by packing effects essentially the same as for WF6, in ad...
TL;DR: A series of mono-and dimethyltin(IV) complexes with N-salicylidene-p-methoxybenzoylhydrazinato) methanol has been prepared and characterized by IR, UV-vis, 1H NMR and mass spectral techniques as mentioned in this paper.
TL;DR: In this paper, the biheterocyclic ligand 2(2′-pyridyl)-1-methylbenzimidazole (MePB) forms complexes of the type UO 2 (mePB)X 2 (X Cl, I, NO 3, CH 3 COO, 0.5 SO 4 ), and Th(MePB 2 X 4 (X 4, NO 3, NCS, I).