![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
GRAPHICAL ABSTRACT
Abstract
Three square planar Ni(II) complexes of the composition [Ni(bzcprdtc)2](1), [Ni(bzcprdtc)(NCS)(PPh3)](2) and [Ni(bzcprdtc)(PPh3)2]ClO4 (3)[(where bzcprdtc = N-benzyl-N-cyclopropyl-dithiocarbamate)] have been synthesized and characterized by 1H and 13C NMR, UV-Vis and FT-IR spectroscopy. 13C NMR spectra show interesting differences between the N13CS2 carbon signals of the parent complex 1 and heteroleptic complex 2. The N13CS2 carbon signal for 2 is observed at 209.3 ppm with an upfield shift of about 3.5 ppm compared with that found for 1 (212.8 ppm). The observed shielding in 2 indicates the effect of PPh3 on the mesomeric drift of electron density toward nickel through the thioureide C‒N bond of [Ni(dtc)(NCS)(PPh3)]. Single crystal X-ray analysis of 2 and [Ni(dbpdtc)(NCS)(PPh3)](4) (dbpdtc = benzyl(4-(benzylamino)phenyl)dithiocarbamate) confirmed distorted square planar arrangement in the vicinity of the nickel atom with a S2NP donor set. Comparative analysis of bond parameters of [Ni(dtc)2] and [Ni(dtc)(NCS)(PPh3)] has also been studied.
