The synthesis,characterization and melting properties of thiophene-containing dithiocarboxylate complexes of nickel(II) |
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| Authors: | Mary S. Thomas,Marilé Landman,Simon Lotz,Elizabeth M. van der Merwe |
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| Affiliation: | 1. Department of Chemistry, University of Limpopo, Turfloop Campus, P. Bag X 1106, Sovenga 0727, South Africa;2. Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa;3. Department of Chemistry, University of South Africa, P. O. Box 392, Pretoria 0003, South Africa |
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| Abstract: | The reactions of a series of 5-alkyl-2-thiophenedithiocarboxylates with nickel(II) chloride afforded two types of complexes, blue nickel(II) complexes with two terminal dithiocarboxylate ligands, [Ni(S2CTR)2] and violet nickel(II) complexes with perthio- and dithiocarboxylate ligands, [Ni(S2CTR)(S3CTR)] (where T = 2,5-disubstituted thiophene, R = CnH2n+1, n = 4, 6, 8, 12, 16). The blue monomers are preferred for the shorter chains (C4 and C6) and the violet compounds form exclusively for the longer chains (C8, C12, and C16) in the alkylthiophene complexes. In addition to the above series, [Ni(S2CTCH3)2], was prepared in a one-pot reaction in THF and both the blue and violet products were isolated. It was possible to convert the blue complexes [Ni(S2CTR)2] (R = butyl, hexyl) into the corresponding violet complexes [Ni(S2CTR)(S3CTR)] after stirring in THF solutions for prolonged periods of time. Liquid-crystalline properties of these complexes were examined by DSC and POM. The violet complexes with C8 and C12 alkyl chains showed liquid-crystalline properties. |
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| Keywords: | Nickel Thiophene Liquid crystal Dithiocarboxylate ligands |
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