Study of the interaction of bis(4-pyridylthio)methane with copper(II) chloride and bromide

The new ligand bis(4-pyridylthio)methane (4-bpytm) (1) and its Complexes [CUX2(4-bpytm)] and [CUX2(4-bPYtM)(2)] (X = Cl and Br) (2-5) have been prepared and characterized by elemental analysis, IR-Raman, UV/Vis spectroscopy. The structures of (4-bpytm) (1), [CUCl2(4-bpytM)(2)] (3) and [CuBr2(4-bpytM)21 (4) were determined by single-crystal X-ray diffraction analysis. X-ray analysis of the 1:2 derivatives reveals that the copper atom has a distorted (4+2) octahedral environment. The copper atom is coordinated by four nitrogen atoms from four bridging 4-bpytm ligands and two halogen atoms. The axial Cu-N bonds are considerably longer than the equatorial Cu-N bonds owing to Jahn-Teller distortion. CUX2 units are linked to each other through bridging 4-bpytm ligands to form a 2D interpenetrated coordination polymer. The structural parameters of the 4-bpytm ligand in these complexes were compared with those of the free ligand.