Fangfang Jian

Synthesis, Crystal Structure and Stability Studies of Dithiocarbamate Complexes of Some Transition Elements (M=Co, Ni, Pd)

Single-crystal x-ray structure determinations have been recorded at 295 K for the dithiocarbamate metal compounds [Co(Et2dtc)3], [Co(nPr2dtc)3], [Pd(iPr2dtc)2] and [Pd(Et2dtc)2]. The stability constants(K) in EtOH of dialkyldithiocarbamate metal complexes [M(R2dtc)n] (M=Co, Ni, Pd. R=Me, Et, iPr, nPr. n=2, 3. dtc=dithiocarbamate) are determined by UV-vis data. The stability of the metal complexes increases in the order: Co<Ni<Pd. The effects of alkyl groups on the stability of [M(R2dtc)2] (M=Ni and Pd) increase in the order: Me<Et<nPr<iPr, and [Co(R2dtc)3] decrease in the order: Et>iPr>nPr>Me. The results obtained from this study confirm that the stability due to alkyl groups may be partly attributed to changes in the residual positive charge and also partly to steric hindrance of branched alkyl-groups. The comparison between the solid and solution states shows that the [M(R2dtc)2] (M=Pd, Ni) complexes have similar changes in M-S distance and stability with change in alkyl group. [M(iPr2dtc)2] has the shortest M-S distance and the highest stability in solution.

Structure and characterization of bis(N-p-chloro-phenyl-salicylideneaminate) Schiff base copper(II) complex: Cu[N-p-Cl-Ph-Sal]2

The crystal and molecular structure of the title compound has been determined by X-ray crystallography. It crystallizes in the monoclinic system, space group P21/c, with lattice parameters a = 13.678(3), b = 10.729(2), c = 8.1996(2) Å, β = 98.96°, V = 1188.7(4) Å3, and Z = 4. The crystal structure contains two centrosymmetric molecules of bis (N-p-chloro-phenyl-salicylideneaminate) Schiff base copper(II). Copper(II) ion is coordinated in a slightly distorted trans square-planar configuration, the distortion consisting of a reduction of the N–Cu–O angle with the chelate rings from the ideal value of 90°. The p-chlorophenyl rings with salicylidene moieties form a dihedral angle of 38.96°.

Structure and characterization of hexakis(imidazole) cobalt(II) complexes: [Co(Im)6(OBz)2] and [Co(Im)6(mB)2] (Im = imidazole, OBz = benzoate, mB = p-methoxybenzoate)

AbstractThe crystal and molecular structures of the complexes of [Co(Im)6(OBz)2] and [Co(Im)6(mB)2] (Im = imidazole, OBz = benzoate, mB = p-methoxybenzoate) have been determined by X-ray crystallography. The crystal structures are very similar and consist of discrete molecules of [Co(Im)6(OBz)2] and [Co(Im)6(mB)2], respectively. They both crystallize in the triclinic system, space group

Bis­(O,O′-di-p-tolyldithiophosphato-S,S′)(1,10-phenanthroline-N,N′)nickel(II)

P\bar 1

Bis(O,O′-diiso­propyl di­thio­phosphato-S,S′)(1,10-phenanthroline-N,N′)metal(II) complexes with cadmium(II) and iron(II)

the former with lattice parameters a = 7.6934(3), b = 10.4518(5), c = 11.6088(5) Å, α = 73.920(1), β = 79.023(1), γ = 73.681(1)°, and Z = 1; the latter with a = 9.8336(3), b = 10.5509(2), c = 10.8889(3) Å, α = 61.450(1), β = 76.832(1), γ = 71.157(1)°, and Z = 1. The cobalt(II) ions have octahedral geometry with a CoN6 chromophore. In the solid state, the complexes all form a three-dimensional network through N—H···O hydrogen bonds. The electronic spectra and IR spectra data are in agreement with the structural data.

(2-Methylquinolin-8-olato)iron(III) and -copper(II) complexes.

In the title compound [2-hydroxybenzaldehyde 2-pyridylcarbonylhydrazone hemihydrate, C 13 H 11 N 3 O 2 .-0.5H 2 O or (1).0.5H 2 O], molecules of (1) are linked pairwise through intermolecular N-N…N hydrogen bonds. These pairs alternate with hydrogen-bonded water molecules to form one-dimensional chains.

Structure of bis(O,O′-diisopropyldithiophosphato-S,S′) (1,10-phenanthroline-N1,N10)zinc(II) complex, [Zn(phen)(S2P(OiPr)2)2]

The title coordination complex, [Ni(C14H14O2PS2)2(C12H8N2)] or [Ni(pMePh-dtp)2(phen)] (phen is 1,10-phenanthroline; dtp is diaryldithiophosphate), has a non-crystallographic twofold axis of symmetry through the Ni atom and the phen moiety. Two O,O-di-p-tolyldithiophosphate (dtp) ions act as bidentate ligands. The central metal atom is coordinated by four S atoms from two dtp groups and two N atoms from the phen ligand. The title compound displays distorted octahedral geometry around the central Ni atom.

(N,N-Diisopropyldithiocarbamato-S, S')bis(triphenylphosphine-P)gold(I) butane solvate

The compound, [Ni(phen)3]NO3 · C2H5OP(O)O · 3H2O, was obtained by the reaction of Ni(NO3)2, C2H5OP(OH)2 and 1,10-phenanthroline in 95% EtOH solution, and was characterized using IR and UV spectra and magnetic susceptibility measurements over the temperature range 75-300 K. The red crystal is triclinic of space group P&1macr;, with lattice parameters a = 12.462(3), b = 13.416(3), c = 13.422(3) Å, f = 75.88(3), g = 64.75(3), n = 65.87(3)°, and Z = 2. The coordinated cation contains a six-coordinate nickel atom chelated by three phenanthroline ligands, resulting in a distorted octahedral arrangement with the six Ni-N distances ranging from 2.086(2) to 2.113(3) Å. In addition to the nickel coordination complex, there are two anions, NO3 and C2H5OP(O)O-, and three water molecules which complete the crystal structure. In the solid state, the title compound forms a three dimensional network structure through hydrogen bonds. The intermolecular hydrogen bonds connect the [Ni(phen)3]2+, NO3, C2H5OP(O)O- and H2O molecules.