ReVN and TcVN complexes with a novel tetradentate hybrid benzamidine/thiosemicarbazone ligand
摘要:
N-(diethylthiocarbamoyl)benzimidoyl chloride reacts with o-aminoacetophenone 4-methylthiosemicarbazone under formation of a novel N2S2 benzamidine/thiosemicarbazone ligand (H2L). The reaction of H2L with [ReNCl2(PPh3)(2)] yields a red complex of the composition [ReN(L)]. The molecular structure of [ReN(L)] reveals a square-pyramidal environment around the Re atom, in which the organic ligand occupies all four positions of the equatorial plane. The reaction of H2L with [TcNCl2(PPh3)(2)] results in a mixture of [TcN(L)] and a side-product of the composition [TcN(PPh3)(Et2NC(S)NH)(L')] (L' = 1,10b-dimethyl-5-phenyl-1,10b-dihydro-[1,2,4]triazolo[1,5-c]quinazoline-2-thiolate). The formation of diethylthiourea and HL' is the result of a metal-driven decomposition of H2L followed by cyclization. (C) 2012 Elsevier B.V. All rights reserved.
We report nickel(ii) and copper(ii) complexes containing the benzamidine–thiosemicarbazone ligand together with DFT, enzyme kinetics and in vitro biological applications such as DNA/BSA affinities and anticancer properties.