Synthesis and spectral studies on NiS4, NiS2PN, NiS2P2 chromophores: Single-crystal X-ray structure of [Ni(dbpdtc)2] (dbpdtc = benzyl(4-(benzylamino)phenyl)dithiocarbamate)

Abstract

Three complexes of a dithiocarbamate ligand (dbpdtc = benzyl(4-(benzylamino)phenyl)dithiocarbamate), namely [Ni(dbpdtc) 2 ] (1), [Ni(dbpdtc)(NCS)(PPh 3 )] (2) and [Ni(dbpdtc)(PPh 3 ) 2 ]ClO 4 (3) have been prepared. The complexes were characterized by IR, electronic spectroscopy and cyclic voltammetry. A single-crystal X-ray structural analysis was carried out for complex 1 and showed that the nickel is in a distorted square planar environment with a NiS 4 chromophore. For the two mixed ligand complexes, the thioureide m C-N values were shifted to higher wavenumbers compared to [Ni(dbpdtc) 2 ], suggesting increased strength of the thioureide bond due to the presence of the p-accepting phosphine. Electronic spectral studies suggest square planar geometries for the complexes. Cyclic voltammetry showed easier reduction of nickel(II) to nickel(I) in the mixed ligand complexes compared to [Ni(dbpdtc) 2 ].

Synthesis and Characterization of 3-Methoxypropyldithiocarbamate Complexes with Iron(II), Cobalt(II), Nickel(II), Copper(II) and Zinc(II) and Their Adducts with Nitrogen Base Ligands

“…The important IR bands of the ligand and its complexes are listed in Table (2). The stretching frequency of the υ(C -N) band for the dithiocarbamates was intermediate between the stretching frequencies associated with typical single and double-bonded carbon and nitrogen atoms (Srinivasan et al, 2010). The υ(C -N) and υ(C-S) were observed in the ranges of (1500-1550) cm -1 and ( 968-1038) cm -1 .The presence of only one band in the later region reports the bidentate coordination of the dithio ligand (Serrano, 2003).…”

Synthesis, Characterization and Antibacterial Activities of New Metal Complexes of Unsymmetrical Tetradentate Schiff Bases

“…Assignment of the proposed coordination sites is further supported by the appearance of new band at (450-481) cm -1 and(503-580) cm -1 which could be attributed to υ (M-N) and υ(M-O) respectively (Joel, 2015;Bagat et al, 2009). For (5,6,7,12.13,14) complexes the band of υ (C=N) was observed at (1473-1506)cm -1 which means the coordination of the N atom of pyridine ring with the metal ions (Srinivasan et al, 2010).The I.R spectra of the ligands and their Ni(II) complexes have been shown in Fig1. 4 2 4 .6 4 5 0 9 .5 9 5 3 4 .7 7 5 7 9 .2 9 6 5 2 .3 6 6 7 5 .4 4 7 4 2 .1 1 7 6 8 .7 2 7 8 3 .1 0 8 1 7 .5 4 8 3 9 .7 3 8 6 3 .8 3 8 8 4 .2 5 9 2 0 .2 5 9 7 1 .4 8 1 0 6 9 .6 2 1 1 1 3 .9 7 1 1 6 7 .9 4 1 1 8 5 .1 3 1 2 5 1 .4 9 1 2 9 7 .3 9 1 3 1 6 .2 9 1 3 4 1 .7 5 1 3 9 3 .6 4 1 4 3 6 .5 7 1 4 5 6 .6 8 1 4 7 5 .9 2 1 4 9 9 .7 8 1 5 3 3 .0 9 1 5 4 0 .5 7 1 5 5 9 .0 4 1 6 0 0 .1 9 1 6 0 6 .8 7 1 6 2 5 .6 1 1 6 5 3 .1 2 1 6 6 2 .7 6 1 6 6 9 .2 8 1 6 8 3 .7 2 1 7 0 0 .2 9 1 7 1 7 .0 8 1 7 3 3 .4 7 1 7 5 0 .5 1 1 7 7 2 .1 7 1 7 9 1 .7 8 1 8 2 9 .2 4 1 9 3 0 .4 6 2 8 0 2 .8 8 2 9 4 8 .0 5 3 2 5 9 .7 2 3 3 6 7 .6 2 3 6 2 8 .3 5 3 6 4 8 .4 9 3 6 7 5 .5 7 3 6 8 8 .8 3 3 7 1 0 .5 8 3 7 3 4 .4 2 .5 .6 3 8 0 0 .8 7 3 8 3 7 .6 6 3 8 5 2 .9 2 14 4 2 3 .3 1 4 4 5 .0 1 4 7 3 .4 8 5 0 7 .4 0 5 9 3 .6 1 6 1 8 .9 1 6 5 2 .6 6 6 8 1 .6 9 7 1 8 .7 9 .7 .4 8 1 7 .6 0 8 4 4 .3 4 8 7 2 .3 4 9 3 2 .4 5 9 5 4 .3 3 9 7 4 .5 7 9 9 0 .9 4 1 0 9 7 .0 4 1 1 1 6 .0 0 1 1 6 4 .2 1 1 1 8 4 .0 8 1 2 3 4 .7 6 1 2 6 7 .0 8 1 3 0 5 .4 3 1 3 2 8 .5 4 1 3 5 2 .9 3 1 3 8 4 .1 0 1 4 0 6 .3 9 1 4 6 6 .6 2 1 4 9 0 .5 2 1 5 2 2 .7 5 1 5 7 5 .3 9 1 6 0 4 .1 6 1 6 1 0 .8 3 1 6 2 4 .1 6 1 6 5 4 .3 0 1 9 2 9 .2 4 2 3 6 0 .…”

Synthesis and Characterization of Mn(II), Fe(II) and Co(II) Complexes with 4-Hydroxypiperidinedithiocarbamate and their Adducts with Neutral Bases

“…For dithiocarbamate compounds, three main regions in the IR spectra are of interest. First the 1580-1450 cm -1 region, which is primarily associated with the stretching vibration of C-N group of (N-C) moiety (Srinivasan et al, 2010). The ligand shows a strong absorption at (1479) cm -1 , which is assigned to the C-N stretching frequency.…”