Synthesis, spectral and single crystal X-ray structural studies on bis(2,2’-bipyridine)sulphidoM(II) (M = Cu or Zn) and diaqua 2,2’-bipyridine zinc(II)sulphate dihydrate

Reaction of bis(diethanoldithiocarbamato)copper(II), [Cu(deadtc)2] and bis(di-n-propyldithiocarbamato)zinc(II), [Zn(dnpdtc)2] complexes with 2,2’-bipyridine (2,2’-bipy) (1:1 ratio) in ethanol was investigated. Simple mixing of the reactants in 1:1 ratio resulted in five-coordinated [Cu(2,2’--bipy)2S]•CH3CH2OSO3H (1) and [Zn(2,2’-bipy)2S]•CH3CH2OSO3H·2H2O (2). Refluxing the reactants and cooling the contents result in the formation of [Zn(2,2’-bipy)(H2O)2]SO4 (3) and [Cu(2,2’-bipy)(H2O)2]SO4 (4). Complexes 1 and 2 are monomeric with trigonal bipyramidal geometry. A distorted octahedral environment was observed in complexes 3 and 4. The crystal structure of 4 has already been reported in the literature. Crystal structures of 1, 2 and 3 are reported in this paper. The M–S distances in 1 and 2 are 2.318(1) Å and 2.323 Å, respectively. The N–M–S angles are larger than the N–M–N angles due to the steric requirements

Synthesis and Crystal and Molecular Structure of trans-[PtCl2(8-dqmp)2]* (8-dqmp = diethyl 8-quinolylmethylphosphonate)

The complex trans-PtCl2(8-dqmp)2 – trans-dichloro-bis(diethyl 8-quinolylmethylphosphonate-κN)platinum(II) – has been synthesized and the molecular structure has been determined by a rystallographic study. The platinum atom has a slightly distorted trans square-planar configuration with Pt1–N1 = 2.042(4) and Pt1–Cl1 = 2.306(1) Å. The dihedral angle between the Pt coordination plane and the mean plane of the 8-quinolylmethyl moiety is 65.1(1)°. The complex reveals a very interesting feature: a very short methylene proton–platinum distance of 2.309(5) Å occupying approximately axial positions around the central metal atom for the hydrogen atom H10B. Refinement was performed by least-squares methods to a final R value of 3.02%

2,4-Dithiouracil: the reproducible H-bonded structural motifs in the complexes with 18-membered crown ethers

[[abstract]]2,4-Dithiouracil (DTU) forms in the crystals the H-bonded monohydrates of a 1 : 1 : 1 ratio with 18-crown-6 (18C6) 1, cis,syn,cis-isomer of dicyclohexano-18-crown-6 (DCH6A) 2, and benzo-18-crown-6 (B18C6) 3, while the anhydrous adduct with cis,anti,cis-isomer of dicyclohexano-18-crown-6 (DCH6B) 4 is of a 2 : 1 ratio. In 1–3 the components reproducibly alternate in the chains, while in 4 the chains are built of the alternative centrosymmetric dimers of 2,4-dithiouracil and the molecules of the cis,anti,cis-isomer of dicyclohexano-18-crown-6.[[journaltype]]國外[[incitationindex]]SCI[[booktype]]紙本[[booktype]]電子版[[countrycodes]]GB

Trans influence of triphenylphosphines and pseudohalogens on Ni-S bonds: Synthesis, spectral and single crystal X-ray structural studies on NiS2PN and NiS2PC chromophores

Trans influence of triphenylphosphines and pseudohalogens on Ni-S bonds of NiS2PN and NiS2PC chromophores has been investigated by synthesizing and characterizing them. The complexes show the characteristic thioureide IR band at similar to 1530 cm(-1). Electronic spectrum of the cyanide analogue shows a strong blue shift relative to others. X-ray structures of [Ni(pipdtc)(4-MP)(NCS)] (1), [Ni(pipdtc)(PPh3)(NCS)] (2) and [Ni(pipdtc)(PPh3)(CN)] (3) (pipdtc = piperidinecarbodithioate anion, 4-MP = tri(4-methylphenyl)phopshine) are reported. Ni-S bond distance trans to 4-MP(1) is longer than the distances in (2) and (3) and Ni-S bond distances trans to Ni-NCS/CN decrease as follows: (3) > (2) > (1). Particularly, 4-MP shows a highly significant trans influence than triphenylphosphine on Ni-S bond. Similarly, CN- exerts a marginally significant trans influence compared to NCS-. Thioureide C-N distances are relatively very short due to the drift of electron density towards the metal. The Ni-N-C angle (163.5(2)A degrees) observed in (2) indicates deviation from linearity to a larger extent compared to that in (1) (176.3(3)A degrees) due to the steric effect of the 4-methyl group. The reduction potentials (CV) for the mixed ligand complexes are much less compared to that of the parent NiS4 chromophore due to the pi-acidic phosphines

Synthesis, spectral and single crystal structure determination of [1,3-bis(diphenylphosphino-kP,P′)propane(4-morpholinecarbodithioato-S,S′) nickel(II) perchlorate and [1,4-bis(diphenylphosphino-kP,P′)butane (4-morpholinecarbodithioato-S,S′)nickel(II) perchlorate complexes

[Ni(mdtc)(1,3-dppp)]ClO4 (1), and [Ni(mdtc)(1,4-dppb))ClO4 (2) [(mdtc(-) = 4-morpholinecarbodithioato anion. 1,3-dppp = 1,3-bis(diphenylphosphino)propane, 1.4-dppb = 1.4-bis(diphenylphosphino)butane)] have been prepared from their parent dithiocarbamate. The planar complexes were characterized by electronic and IR spectra. Single crystal X-ray structures of compounds 1 and 2 were determined. Both the complexes have planar NiS2P2 chromophores in keeping with the observed diamagnetism. Ln complexes 1 and 2 the Ni-S and Ni-P distances are symmetric. The thioureide C-N distances of both the complexes show a decreasing trend compared to the C-N distance in the parent Ni(mdtc),. The resulting P-Ni-P angles are higher in both the complexes (96.5(1)degrees in 1. 101.4(8)degrees in 2) due to puckering of propane and the butyl alkyl chain associated with 1,3-dppp and 1,4-dpppb

Copper (II) complexes with singly condensed tridentate Schiff-base ligands incorporating 1-benzoylacetone

Two copper (II) complexes [CuL1Cl]n (1) and [CuL2Cl] (2) with singly condensed tridentate Schiff-base ligands [HL1 = 6-amino-3-methyl-1-phenyl-4-azahex-3-en-1-one and HL2 = 6-diethylamino-3-methyl-1-phenyl-4-azahex-3-en-1-one] have been synthesized and structurally characterized by X-ray crystallography. Complex 1 is a single-chloro-bridged one-dimensional polymer, whereas 2 is a monomeric square-planar complex. The H-bonding interactions of the amine hydrogen and the non-bonding interactions of phenyl groups in the Schiff base play important roles for the structural variations

A novel copper(II) complex with a pendant Schiff base: an unprecedented monodentate bonding mode of the potentially tridentate ligand

The 1:1 condensation of 1-benzoylacetone and 1,2-diaminopropane yields 6-amino-3-methyl-1-phenyl-4-azahept-2-en-1-one (HL). When copper (II) perchlorate is added to the methanolic solution of HL, followed by triethylamine in 1:2:1 molar ratio, an unusual copper (II) complex, [Cu(L)(HL)]ClO4, is separated out where the deprotonated ligand, L, is coordinated in the usual chelating tridentate manner but HL is coordinated to Cu(II) only through the amine N, i.e. it acts as a pendant ligand. The complex is characterized by X-ray crystal structure analysis