New technetium(V)-nitrido complexes with bi- and tri-dentate Schiff bases, derived from the condensation of various aldehydes and acetone with the methyl ester of dithiocarbazic acid, NH2NHC(=S)SCH3, were prepared by substitution or substitution-reduction reactions on the square-pyramidal complexes [TcVNCl2(PPh3)2] and [TcVINCl4]-. The final complexes all maintain the square-pyramidal geometry of the starting compounds with the Tc≡N group in an apical position. The bidentate ligands give rise to mono- and di-substituted complexes, in which they are co-ordinated to the metal through the β-nitrogen atom and the thiol sulphur atom; in monosubstituted complexes, the remaining two positions in the plane of the square pyramid are occupied by triphenylphosphine (PPh3) and Cl- groups. The tridentate Schiff bases co-ordinate to the metal, in the basal plane, as doubly negatively charged ligands through the phenolic oxygen atom, the β-nitrogen atom, and the thiol sulphur atom, the fourth positio...
Technetium(V)-nitrido complexes of dithiocarbazic acid derivatives. Reactivity of [Tc≡N]2+ core towards Schiff bases derived from S-methyl dithiocarbazate. Crystal structures of [S-methyl 3-(2-hydroxyphenylmethylene)dithiocarbazato]nitrido(triphenylphos-phine)technetium(V) and bis(S-methyl 3-isopropylidenedithiocarbazato)nitridotechnetium(V)
DUATTI, Adriano;BERTOLASI, Valerio;FERRETTI, Valeria;G. GILLI
1988
Abstract
New technetium(V)-nitrido complexes with bi- and tri-dentate Schiff bases, derived from the condensation of various aldehydes and acetone with the methyl ester of dithiocarbazic acid, NH2NHC(=S)SCH3, were prepared by substitution or substitution-reduction reactions on the square-pyramidal complexes [TcVNCl2(PPh3)2] and [TcVINCl4]-. The final complexes all maintain the square-pyramidal geometry of the starting compounds with the Tc≡N group in an apical position. The bidentate ligands give rise to mono- and di-substituted complexes, in which they are co-ordinated to the metal through the β-nitrogen atom and the thiol sulphur atom; in monosubstituted complexes, the remaining two positions in the plane of the square pyramid are occupied by triphenylphosphine (PPh3) and Cl- groups. The tridentate Schiff bases co-ordinate to the metal, in the basal plane, as doubly negatively charged ligands through the phenolic oxygen atom, the β-nitrogen atom, and the thiol sulphur atom, the fourth positio...I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
