Synthesis, Characterization, and X-Ray Structure of Bis(O-butyldithiocarbonato)bis(3-ethyl pyridine)nickel(II)

A new series of additional complexes of bis(O-butyldithiocarbonato)nickel(II) with ethylpyridines have been prepared and characterized by physicochemical techniques like elemental analysis, molar conductance measurements, TGA-DTA and UV-visible electronic spectroscopy, and IR-spectral data. The structure of [Ni(S2COC4H9)2(C7H9N)2] has been established by X-ray crystallography. The complex crystallizes in the monoclinic space group P1/n with unit cell parameters , , and ？？ and , , and °. The Ni atom in the title complex is octahedrally coordinated within a trans-N2S4 donor set, with the Ni atom located on a centre of inversion. Crystal structure was solved by direct methods and refined by full matrix least squares procedures to a final -value of 0.0545 for 1984 observed reflections. The butyl chain is disordered over two sets of sites, with occupancy ratio of 0.572？:？0.427. 1. Introduction O-alkyldithiocarbonate ( ), named xanthate, represents an important class of 1, 1 dithiolato ligands which have been studied extensively [1, 2]. These compounds form water insoluble complexes with most of the transition metals and are thus extensively employed for the separation and quantitative determination of cations of transition metals [3]. Beside this these ligands are also investigated for nonlinear optical application and as a synthetic precursor for the generation of metal sulfide nanoparticles [4, 5]. Xanthates as ligand are also extensively studied for a wide variety of structural features. They are known to coordinate as a monodentate, bidentate, or as a bridging ligand. Xanthate complexes of composition [Ni(Rxa)2] (R = alkyl; xa = xanthate) are partially unsaturated and thus they can react easily with monodentate or bidentate nitrogen donor ligands and afford octahedral nickel(II) complexes with either cis or trans geometry. As a part of our ongoing research on nickel(II) xanthate complexes with substituted pyridines, we report here the synthesis and characterization of 1？:？2 adducts of bis(O-butyldithiocarbonato)nickel(II) with ethyl pyridines and also the crystal structure of the adduct bis(O-butyldithiocarbonato)bis(3-ethylpyridine)nickel(II). 2. Experimental 2.1. Material and Measurement Carbon, hydrogen, sulphur, and nitrogen contents of the addition complexes are determined on elemental analyzer CHNS 932, LECO Corporation, USA. Molar conductance of adducts was determined on their millimolar4 solutions in DMF by using digital conductivity meter “Century CC 601.” Infrared spectra of the complexes over the region 4000–200？cm？1 were recorded using KBr