2016. 57, 8 – UDC 541.6:541.49:546.47 CHARACTERIZATION OF THE ADDUCTS OF BIS(O-ISOAMYLDITHIOCARBONATO)NICKEL(II) WITH HETEROCYCLIC AMINES AND X-RAY STRUCTURE OF BIS(O-ISOAMYLDITHIOCARBONATO)BIS(3-BROMOPYRIDINE)NICKEL(II) Neerupama1, G. Kour2, R. Sachar1, R. Kant2 1Department of Chemistry, University of Jammu, Jammu Tawi, India 2X-Ray Crystallography Laboratory, Post-Graduate Department of Physics & Electronics, University of Jammu, Jammu Tawi, India E-mail: rkant.ju@gmail.com Received June 16, 2015 A series of six-coordinated Ni(II) complexes, with the general formula Ni(Xan)L2 (where Xan = isoamyldithiocarbonato and L = 2-bromopyridine, 3-bromopyridine, 4-acetylpyridine, 3-hydroxypyridine and 2-methoxypyridine) are synthesized and characterized by the elemental analysis and various physicochemical techniques such as magnetic susceptibility and conductivity measurements, UV-visible and infrared spectral data. <...> Based on the electronic spectra and magnetic susceptibility measurements, an octahedral geometry is proposed for all the complexes. <...> IR spectral data show that in all these complexes substituted pyridines coordinate to the metal ion through nitrogen atoms occupying the fifth and sixth axial positions, whereas O-alkyldithiocarbonate acts as a monoanion bidentate ligand and occupies the planar positions of octahedral structures. <...> The structure of the adduct with 3-bromopyridine is elucidated by the single crystal X-ray diffraction method. <...> INTRODUCTION Dithiocarbonates have been known for a long time [ 1, 2 ]. <...> Among sulfur donating ligands, 1,1 dithiolates, which include dithiocarbamates, dithiocarbonates, and dithiocarboxylates, have invited much research attention of chemists, physicists, and biologists due to their diverse applications and interesting biological, structural, magnetic, electrochemical, and thermal properties [ 6, 7 ]. <...> In this paper we report the synthesis and characterization of the adducts of bis(O-isoamyldithiocarbonato)nickel(II) with heterocyclic amines and the X-ray structure of bis(O-isoamyldithiocarbonato)bis(3-bromopyridine)nickel(II). <...> The saturated aqueous solutions of NiCl2 6H2O (2.37 g, 0.01 mol) and potassium O-isoamyldithiocarbonate (4.04 g, 0.02 mol) were prepared separately and then mixed with constant stirring. <...> The composition of the complex was established by the elemental analysis to be [Ni(S2COC5H11)2]. <...> The 1:2 adducts of bis(O-amyldithiocarbonato) nickel(II) with substituted pyridines were prepared by stirring [Ni(S2COC5H11)2] (1 g, 0.0026 mol) in about 70 <...>