6014-72-8Relevant academic research and scientific papers
Trans effect of triphenylphosphine on Ni–S bonds in solid state and DFT/B3LYP optimized structure: Synthesis, spectral and structural studies on (bis(2-ethylhexyl)dithiocarbamato-S,S′)(thiocyanato-N)(triphenylphosphine)nickel(II)
Valarmathi, Panneerselvam,Srinivasan, Narayanaswamy,Thirumaran, Subbiah,Saminathan, Kolandaivelu
, p. 1183 - 1187 (2016/07/28)
The compounds [Ni(behdtc)2] (1) and [Ni(behdtc)(NCS)(PPh3)] (2) (where behdtc = bis(2-ethylhexyl)dithiocarbamate) were synthesized and characterized by elemental analyses, electronic, IR, and NMR (1H and13C) spectroscopy. UV-vis spectral data are consistent with the formation of square-planar nickel complexes. The N13CS2carbon signal for [Ni(behdtc)(NCS)(PPh3)] is observed at 204.4?ppm with an upfield shift of about 3.8?ppm compared with that found in [Ni(behdtc)2] (208.2?ppm). The observed shielding in [Ni(behdtc)(NCS)(PPh3)] indicates the effect of PPh3on the mesomeric drift of electron density toward nickel through the thioureide C-N bond. This observation is supported by the higher νC-N values observed in the IR spectrum of the complex 2. A single crystal X-ray analysis of complex 2 proved four coordinated nickel in a distorted square-planar arrangement with a S2NP donor set. A significant asymmetry in the Ni–S bond in 2 (2.1690(10) and 2.2234(10)?) supports the less effective trans effect of SCN?over PPh3. Molecular electrostatic potential surface map shows that there are no possible sites for nucleophilic attack and S atom of thiocyanate is preferred possible site for electrophilic attack.
