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(S 2CTR) 2] and violet nickel(II) complexes with perthio- and dithiocarboxylate ligands, [Ni(S 2CTR)(S 3CTR)] (where T = 2,5-disubstituted thiophene, R = C n H 2 n+1 , n = 4, 6, 8, 12, 16). The blue monomers are preferred for the shorter chains (C 4 and C 6) and the violet compounds form exclusively for the longer chains (C 8, C 12, and C 16) in the alkylthiophene complexes. In addition to the above series, [Ni(S 2CTCH 3) 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(S 2CTR) 2] (R = butyl, hexyl) into the corresponding violet complexes [Ni(S 2CTR)(S 3CTR)] 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 C 8 and C 12 alkyl chains showed liquid-crystalline properties.
Published Version
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