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Structural characterization and preliminary decomposition study of four unsymmetrically substituted nickel dithiocarbamate complexes

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Single-crystal X-ray structures of four nickel dithiocarbamate complexes, the homoleptic mixed-organic bis-dithiocarbamates Ni[S2CN(isopropyl)(benzyl)]2, Ni[S2CN(ethyl)(n-butyl)]2, and Ni[S2CN(phenyl)(benzyl)]2, as well as the heteroleptic mixed-ligand complex NiCl[P(phenyl)3][(S2CN(phenyl)(benzyl)], were determined. A slightly distorted square-planar nickel coordination environment was observed for all four complexes. The organic residues adopt conformations to minimize steric interactions. Steric effects also may determine puckering, if any, about the nickel and nitrogen atoms, both of which are planar or nearly so. A trans-influence affects the Ni-S bond distances. Nitrogens interact with the CS2 carbons with a bond order near two; the other substituents on nitrogen display transoid conformations. There are no strong intermolecular interactions, consistent with prior observations of the volatility of nickel dithiocarbamate complexes. A preliminary thermolysis study of the homoleptic species results in production of 1 : 1 nickel sulfide phases, indicating the potential utility of these species as “single-source” precursors.
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Keywords: Nickel dithiocarbamate; X-ray diffraction; crystal structures; thermogravimetric analysis; triphenylphosphine

Document Type: Research Article

Affiliations: 1: Department of Chemistry, Cleveland State University, Cleveland, OH, USA 2: Department of Chemistry, Wheeling Jesuit University, Wheeling, WV, USA 3: Department of Chemistry, Purdue University, West Lafayette, IN, USA 4: Photovoltaics and Electrochemical Systems Branch, NASA Glenn Research Center, Cleveland, OH, USA

Publication date: January 2, 2016

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