Showing papers on "Octahedral molecular geometry published in 1982"
TL;DR: In this paper, four tin(IV) complexes of tridentate dithiocarbazate Schiff bases have been synthesized and characterized by their elemental analyses and UV, IR, 1H NMR, and Mossbauer spectroscopies and X-ray powder diffraction.
62 citations
TL;DR: In this article, the structure of the triethylphosphinecarbon disulfide adduct Et 3 PCS 2 with iron(II) aquocations in the presence of the bis(tertiary phosphines) depe or diphos was determined from counter diffraction X-ray data.
23 citations
TL;DR: In this paper, the octahedral anions [M(SnCl3)5Cl]4− (M = Ru, Os) have been fully characterized by 119Sn FT nmr spectroscopy.
Abstract: The octahedral anions [M(SnCl3)5Cl]4− (M = Ru, Os) have been fully characterized by 119Sn FT nmr spectroscopy. For M = Ru, 117Sn and 115Sn nmr spectra were also recorded, and an X-ray crystallographic study was carried out on the tetraethylammonium salt, isolated as a disolvate from acetonitrile. The Ru—Sn bond lengths indicate some degree of dπ–dπ interactions. The slight distortions from octahedral geometry are discussed in connection with the packing of the chlorine atoms. The Sn nmr spectra reveal the first observed coupling to a 99Ru nucleus (I = 5/2, 12.7% natural abundance), very large 2J(119Sn—117Sn) coupling constants, and the first observed second-order effects on a heteronuclear system. The octahedral anion [Ru(SnCl3)5(MeCN)]3− was also synthesized as the tetraethylammonium salt and characterized spectroscopically.
20 citations
TL;DR: In this paper, the UV photoelectron spectra of tris(butadiene)molybdenum and -tungsten have been recorded and assigned with the assistance of extended Huckel molecular orbital calculations.
16 citations
TL;DR: In this paper, the crystal structures of the title compounds have been determined from three-dimensional X-ray counter data, and the structure has been refined to R 5.2% for 1262 observed reflections.
14 citations
TL;DR: Manganese(II) complexes of the general composition Mn(ligand)2X2 have been prepared and characterised by elemental analysis, magnetic moments, infrared, electronic spectra and electron spin resonance spectral studies as mentioned in this paper.
Abstract: Manganese(II) complexes of the general composition Mn(ligand)2X2, where X = cl, Br, I and the ligands are R1R2C = NNHCOHH and R1R2C = NNHCSNH2 (R1 =R2 = cycloheptane and cyclopantane) have been prepared and characterised by elemental analysis, magnetic moments, infrared, electronic spectra and electron spin resonance spectral studies. All these complexes are of octahedral geometry.
12 citations
TL;DR: In this article, the authors measured the radial distribution curves of X-ray diffraction measured on the solutions with varying concentrations, 4.364-1.016 mol dm−3.
Abstract: The solute structure of concentrated aqueous copper(II) bromide solutions was determined by the analysis of the radial distribution curves of X-ray diffraction measured on the solutions with varying concentrations, 4.364–1.016 mol dm−3. The mixed-ligand aquabromocopper(II) complexes were found to be present in these solutions, and to have a distorted octahedral geometry. The Cu2+ ion was coordinated with Br− ions at the equatorial sites whose bond lengths were shorter than the axial sites. The interatomic distances of the equatorial Cu–Br and Cu–OH2 bonds were, respectively, 2.42–2.46 and 1.96–1.99 A, and that of the axial Cu–OH2 bond, 2.37–2.51 A. The average coordination number of Br− ions in the nearest neighbor of the Cu2+ ion increased from 0.33 to 1.31 as the concentration of CuBr2 increased from 1.016 to 4.364 mol dm−3. Even in the 4.364 mol dm−3 solution, which was nearly saturated, the coordination of the Br− ion at the axial site was not evidenced. In the 1.474 mol dm−3 CuBr2 solution dissolved ...
10 citations
TL;DR: In this article, the effect of pyridine adduct formation is to increase the Cu-O σ-interaction, which reveals the presence of σ and π-interactions of the ligand with copper through nitrone oxygen.
Abstract: Copper(II) complexes of the type CuL2, 2H2O and CuL2. Py where L=α-(2-hydroxy-1-naphthyl)-N-R-nitrone (R= methyl, phenyl and variously substituted phenyls) have been isolated and characterised. They have normal magnetic moments. Their ligand field spectra indicate an octahedral geometry for the dihydrates and a five-coordinate environment for the pyridine adducts. Increased ν(C=N) and considerably decreased ν(N-O) frequencies in these complexes reveal the presence of σ- and π-interactions of the ligand with copper through nitrone oxygen. The effect of pyridine adduct formation is to increase the Cu-O σ-interaction.
9 citations
TL;DR: In this paper, a distorted octahedral geometry is found for each complex with the bipyridine group coordinated as a bidentate ligand to the copper(II) ion.
9 citations
TL;DR: In this article, the six-coordinate octahedral geometry of the VOL2X2 and VOL1X2 complexes has been characterized by elemental analysis, room temperature magnetic moments, electronic, and electron spin resonance spectral studies.
Abstract: Oxovanadium(IV) complexes, VOL2X2 (L = acetone semicarbazone and acetone thiosemicarbazone, X = Cl, Br, NO3, ClO4 and 1/24) have been synthesised and characterised by elemental analysis, room temperature magnetic moments, electronic, i.r. and electron spin resonance spectral studies. The complexes have been foundto possess six-coordinate octahedral geometry.
8 citations
TL;DR: In this paper, the structure of the PtMe2(NO2)2(PEt3)2 has been determined by X-ray diffraction using the heavy-atom method.
Abstract: The interaction of nitric oxide with cis-PtMe2(PEt3)2 gives a quantitative yield of PtMe2(NO2)2(PEt3)2 whose structure has been determined by X-ray diffraction. The crystals of the complex are monoclinic, space group P21, with a= 7.278(1), b= 12.120(1), c= 11.867(1)A, and β= 94.56(1)°. The structure was solved via the heavy-atom method and refined to an R value of 0.032 for 2 935 observed diffractometer data. The platinum(IV) atom has the expected octahedral geometry with cis methyls [Pt–C 2.077(9), 2.111(8)A], cis nitro-groups [Pt–N 2.184(6), 2.198(8)A], and trans phosphines [Pt–P 2.337(3), 2.430(3)A].
TL;DR: In this paper, mixed-ligand complexes of the type MS/sub2/ (MeBI)/sub2 / (where M=Cu(II), Ni(II, Co( II), Mn(II) and Zn(II); SH=N-6methyl benzothiazol-2-yl-salicyladldimine and MeBI=2-methyl benzimidazole) and VOS/sub 2 /
Abstract: Mixed-ligand complexes of the type MS/sub2/ (MeBI)/sub2/ (where M=Cu(II), Ni(II), Co(II), Mn(II), Zn(II), Cd(II), Hg(II), SH=N-6-methyl benzothiazol-2-yl-salicyladldimine and MeBI=2-methyl benzimidazole) and VOS/sub2/. MeBI have been synthesised and characterised on the basis of analysis, molar conductance, magnetic moments, electronic and i.r. spectral data. All the complexes, were found to be nonelectrolyte and possessed octahedral geometry.
TL;DR: In this paper, a 13 C and 19 F NMR study of twenty-four ruthenium, rhodium, palladium, and platinum complexes containing a difluoromethyl or a trifluorsomethsyl substitutent (R′) on the monothio-β-diketone, RCSCH 2 COR′, is reported.
TL;DR: In this paper, the hardness of the softness values of the Lewis acids and their complexes with various bases have been characterized by elemental analyses, molar conductance, molecular weight, magnetic moment, infrared and electronic spectral studies.
TL;DR: In this article, the 1:1 (metal-ligand) stoichiometry of these complexes is shown by elemental analysis, gravimetric estimations and conductometric titrations while the structures of the complexes are proved by i.r. spectra and thermogravimetric analysis.
Abstract: Complexes of Cu(II), Ni(II) and Co(II) with the Schiff bases derived from o-aminobenzoic acid with salicylaldehyde and its 5-chloro and 5-bromo derivatives have been prepared. The 1:1 (metal-ligand) stoichiometry of these complexes is shown by elemental analysis, gravimetric estimations and conductometric titrations while the structures of the complexes are proved by i.r. spectra and thermogravimetric analysis. The magnetic susceptibility and electronic spectra of Cu(II) complexes indicate the nonplanar binuclear structures while that of Ni(II) and Co(II) show their paramagnetic octahedral geometry. The molar conductance values in nitrobenzene indicate the nonelectrolytic behaviour of the complexes. The results show that the complexes of the type (Cu·L)2, Ni·L·3H2O and Co·L·3H2O are formed having solvent molecule in coordination with the metal ion. The monopyridine and monoammonia adducts of Cu(II) complexes were found to be monomeric.
TL;DR: In this paper, zero-field splitting parameters for manganese-II ions doped into the halide-bridged polymers Cd(py)2X2(X = Cl or Br), Cd (4Me-py)-2Cl2, Cd-pyz)X2, X = Cl, Br, or I, and Zn(pyz)-Cl2·0.14 cm −1 for the chlorides, and ca. 0.3 cm−1 for bromides.
Abstract: E.s.r. spectra at X and Q band are reported for manganese(II) ions doped into the halide-bridged polymers Cd(py)2X2(X = Cl or Br), Cd(4Me-py)2Cl2, Cd(pyz)X2(X = Cl, Br, or I), and Zn(pyz)Cl2·0.5H2O (py = pyridine, 4Me-py = 4-methylpyridine, pyz = pyrazine). Zero-field splitting parameters D and λ(=E/D) are obtained. For all the complexes λ is close to zero, while D is in the range 0.11–0.14 cm –1for the chlorides, and ca. 0.3 cm–1 for the bromides. The distortion from octahedral geometry is therefore less than in related MnN4X2 complexes.
TL;DR: A trigonal bipyramidal geometry has been proposed for acridine, piperazine and pyrrolidine complexes while phenanthro-line and 2,2′-bipyridyl adducts seemed to have an octahedral geometry as discussed by the authors.
Abstract: Trimethyltin(IV) chloride, triphenyltin(IV) chloride and tributyltin (IV) chloride adducts of piperazine (Pz), acridine (Acr), pyrrolidine (Pyrr), phenenthroline (phen) and 2,2′-bipyridyl (Bipy) have been synthesized and characterized on the basis of elemental analysis, I. R. spectroscopy and conductivity measurements. The adducts have been found to have a 1:1 metal to ligand ratio and exhibit nonionic character in nitrobenzene or methanol. A trigonal bipyramidal geometry has been proposed for acridine, piperazine and pyrrolidine complexes while phenanthro-line and 2,2′-bipyridyl adducts seemed to have an octahedral geometry.
TL;DR: In this article, the I:I stoichiometry of Salicylidene-o-aminobenzothiol and its 5-chloro and 5-bromo derivatives was shown by elemental analysis and conductometric titrations.
Abstract: Salicylidene-o-aminobenzothiol and its 5-chloro and 5-bromo derivatives, dibasic tridentate Schiff bases, dervied from the condensation of o-aminothiol and Salicylaldehyde, 5-chloro salicylaldehyde and 5-bromo salicylaldehyde, were used for coordination with Zr(IV), Th(IV) and UO2(VI) metal inos. The I:I (metal-ligand) stoichiometry of these complexes is shown by elemental analysis and conductometric titrations. Molecular structure of these complexes are proved by Infra-red spectroscopy and thermogravimetric analysis. Magnetic susceptibility measurements of Zr(IV), Th(IV) and UO2(VI) complexes show their diamagnetic and octahedral geometry. Results show that all the complexes have solvent molecules in coordination with metal ion.