摘要:
N-Thioamide thiosemicarbazone derived of 2-chloro-4-hydroxy-benzaldehyde (R = H, HL1; R = Me, HL2 and R = Ph, HL3) have been prepared and their reaction with fac-[ReX(CO)(3)(CH3CN)(2)] (X = Br, Cl) in chloroform gave the adducts [ReX(CO)(3)(HL)] (1a X = Cl, R = H; 1a' X = Br, R = H; 1b X = Cl, R = CH3: 1b', X = Br, R = CH3; 1c X = Cl, R = Ph: 1c' X = Br, R = Ph) in good yield. Complexes 1a' and 1b' were also obtained by the reaction of HL1 and HL3 with [ReBr(CO)(5)] in toluene.All the compounds have been characterized by elemental analysis, mass spectrometry (FAB), IR and H-1 NMR spectroscopic methods. Moreover, the structures of HL2, HL3 and 1a center dot H2O were also established by X-ray diffraction. In la, the rhenium atom is coordinated by the sulphur and the azomethine nitrogen atoms, forming a five-membered chelate ring, as well as three carbonyl carbon and chloride atoms. The resulting coordination polyhedron can be described as a distorted octahedron.The study of the crystals obtained by slow evaporation of methanol and DMSO solutions of the adducts 1a' and 1b, respectively, showed the formation of dinner structures based on rhenium(I) thiosemicarbazonates [Re-2(L-1)(2)(CO)(6)]center dot 3H(2)O (2a)center dot 3H(2)O and [Re-2(L-2)(2)(CO)(6)]center dot(CH3)(2)SO (2b)center dot 2(CH3)(2)SO. Amounts of these thiosemicarbazonate complexes [Re-2(L)(2)(CO)(6)] (2) were obtained by reaction of the corresponding free ligands with [ReCl(CO)(5)] in dry toluene. In 2a center dot 3H(2)O and 2b center dot 2(CH3)(2)SO the dimer structures are established by Re-S-Re bridges, where S is the thiolate Sulphur from a N,S-bidentate thiosemicarbazonate ligand.In both structures the rhenium coordination sphere is similar; the dimers are in the same diamond Re2S2 face. (C) 2009 Elsevier Ltd. All rights reserved.