Structural and thermal properties of new copper and nickel single-source precursors

Abstract

The synthesis and characterization of two novel copper and nickel coordination compounds with 2-aminobenzothiazole is reported. The crystals were obtained after adding solid 2-aminobenzothiazole to a methanol solution of Cu(CH3COO)2·H2O and after adding a methanol solution of Ni(CH3COO)2·4H2O to a methanol solution of 2-aminobenzothiazole. The products were characterized using single-crystal X-ray diffraction analysis, infrared spectroscopy and thermal analysis. The crystals of the compound bis(acetato-O)-bis(2-aminobenzothiazole-N)-copper(II), [Cu(O2CCH3)2(C7H6N2S)2] (1) and colorless crystals of bis(acetato-O)-bis(2-aminobenzothiazole-N)-nickel(II), [Ni(O2CCH3)2(C7H6N2S)2] (2) are stable in air. Non–covalent interactions including intra- and inter-molecular hydrogen bonds in both crystal structures are discussed along with the Jahn-Teller effect of the structures. Both of the compounds are acting as single-source precursors of nanostructured metal sulfides. Namely, thermal analysis showed that the final product of heating compound 1–600 °C is nanocrystalline copper sulfide, Cu9S5, while the final product of heating compound 2–1100 °C is nickel sulfide, Ni3S2.