Synthesis, spectral, valence-bond parameters, and single crystal X-ray structural studies on [Ni(dnpdtc)(PPh3)(NCS)] and [Ni(dnpdtc)(PPh3)(CN)]

摘要

Two new nickel complexes withplanar surrounding of Ni [Ni(dnpdtc)(PPh3)(NCS)] (1) and [Ni(dnpdtc)(PPh3)(CN)] (2) (dnpdtc=N,N-dipropyldithiocarbamate) were prepared from the parent dithiocarbamate and were characterized by elemental analysis, electronic, IR and NMR spectra. The structures of both the complexes were determined by single crystal X-ray crystallography. Thioureide stretching vibrations occur at 1528 cm(-1) and 1521 cm(-1) for 1 and 2 respectively. Large P-31 chemical shifts were observed for the two compounds. A significant asymmetry in Ni-S bond distances was observed in compound 1 [2.1700(16) and 2.2251(17)Angstrom] whereas in compound 2 the bond distances were almost similar [2.2100(14) and 2.2122(13)Angstrom]. A marginal difference was observed with respect to the thioureide bond distances [1.340(6)Angstrom for 1 and 1.312(5)Angstrom for 2]. The observation clearly supports the less effective trans influence of SCN- over PPh3. However, PPh3 and CN- show almost similar trans influence.