Re VN and Tc VN complexes with a novel tetradentate hybrid benzamidine/thiosemicarbazone ligand

N-(diethylthiocarbamoyl)benzimidoyl chloride reacts with o-aminoacetophenone 4-methylthiosemicarbazone under formation of a novel N 2S 2 benzamidine/thiosemicarbazone ligand (H 2L). The reaction of H 2L with [ReNCl 2(PPh 3) 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 H 2L with [TcNCl 2(PPh 3) 2] results in a mixture of [TcN(L)] and a side-product of the composition [TcN(PPh 3){Et 2NC(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 H 2L followed by cyclization.
URI: http://repository.vnu.edu.vn/handle/VNU_123/27077