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- W1972125958 abstract "Chromium (III) and cobalt (III) complexes derived from 2-ketobutyric acid thiosemicarbazone (H,Kbtsc) have been prepared and characterized. Crystal structure analyses have shown both products to be mixed ligand complexes of the type M(HKbtsc) (Kbtsc) in which the thiosemicarbazone ligand is present in singly deprotonated thione and doubly deprotonated thiol forms. In each complex, the metal ion is bound to two tridentate ligands in a distorted octahedral geometry with meridional stereochemistry. Small but consistent structural differences between the two types of ligands are observed. Spectroscopic and electrochemical data are consistent with the formulations of these com- pounds as derived from the crystallographic results. Transition metal complexes of thiosemicarbazones, R,R,C=N-N(H)-C(S)NH, have been exten- sively studied and have been the subject of several recent reviews.lm3 Thiosemicarbazones have been shown to exhibit a range of types of biological activity which in a number of cases is thought to be related to their ability to chelate trace metals. Also, transition metal complexes of thiosemicarbazones have been found in some instances to have enhanced or modified activity in comparison to the uncom- plexed ligands.3 Simple thiosemicarbazones (R, = H ; RZ = alkyl or aryl) normally bind to transition metals as neutral bidentate ligands, with a five- membered chelate ring formed by metal-sulphur and metal-imine nitrogen bonds. A few cases of monodentate S-binding are known, as are instances of coordination as an anion, formed by depro- tonation at the imide nitrogen atom. Tridentate thiosemicarbazone derivatives may be obtained by" @default.
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- W1972125958 date "1994-01-01" @default.
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- W1972125958 title "Inequivalent coordination of thiosemicarbazone ligands in cobalt (III) and chromium (III) complexes" @default.
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- W1972125958 doi "https://doi.org/10.1016/s0277-5387(00)81652-6" @default.
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