Synthesis, structural characterization and electrochemical studies of nickel(II), copper(II) and cobalt(III) complexes of some ONS donor ligands derived from thiosemicarbazide and S-alkyl/aryl dithiocarbazates |
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Authors: | Mohammad Akbar Ali Ai Ling Tan Aminul Huq Mirza Jose H Santos Aimi Hanisah Bte Hj Abdullah |
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Institution: | 1. Chemistry Programme, Faculty of Science, Universiti Brunei Darussalam, Jln. Tungku Link, BE, 1410, Negara Brunei Darussalam, Brunei
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Abstract: | Four tridentate ONS ligands, namely 2-hydroxyacetophenonethiosemicarbazone (H2L1), the 2-hydroxyacetophenone Schiff base of S-methyldithiocarbazate (H2L2), the 2-hydroxy-5-nitrobenzaldehyde Schiff base of S-methyldithiocarbazate (H2L3), and the 2-hydroxy-5-nitrobenzaldehyde Schiff base of S-benzyldithiocarbazate (H2L4), and their complexes of general formula Ni(HL1)2], ML] (M?=?NiII or CuII; L?=?L1, L2, L3 and L4), Co(HL)(L); L?=?L1, L2, L3 and L4] and ML(B)] (M?=?NiII or CuII; L?=?L2 and L4; B?=?py, PPh3) have been prepared and characterized by physico-chemical techniques. Spectroscopic evidence indicates that the Schiff bases behave as ONS tridentate chelating agents. X-ray crystallographic structure determination of NiL2(PPh3)] and CuL4(py)] indicates that these complexes have an approximately square-planar structure with the Schiff bases acting as dinegatively charged ONS tridentate ligands coordinating via the phenoxide oxygen, azomethine nitrogen and thiolate sulfur atoms. The electrochemical properties of the complexes have been studied by cyclic voltammetry. |
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