title: Synthesis and characterization of novel trigonal bipyramidal technetium(III) mixed-ligand complexes with SES/S/P coordination (E = O, N(CH3), S).
abstract: Five-coordinate oxotechnetium(V) mixed-ligand complexes [TcO(SES)(S-p-C6H4-OMe)], where SES is a tridentate dithiolato fragment of the type -S(CH2)2E(CH2)2S- (E = O, 1; E = S, 2; E = NMe, 3) are converted via reduction-substitution reactions in the presence of PMe2Ph into the corresponding five-coordinate Tc(III) complexes [Tc(SES)(S-p-C6H4-OMe)(PMe2Ph)] (E = O, 4; E = S, 5; E = NMe, 6). Rearrangement of the original square pyramidal "3 + 1" oxo species to the trigonal bipyramidal "3 + 1 + 1" Tc(III) complexes occurs by placing the three thiolate donors on the basal plane, the phosphine phosphorus, and the heteroatom of the tridentate ligand at the apexes of the bipyramid. These Tc(III) complexes are diamagnetic species, thereby allowing multinuclear NMR characterization in solution, which confirm their structures to be identical to those observed in the solid state via X-ray determinations.
authors.affiliation: Forschungszentrum Rossendorf, Institut für Bioanorganische und Radiopharmazeutische Chemie, PF 510 119, D-01314 Dresden, Germany.
authors.forename: H J
authors.initials: HJ
authors.lastname: Pietzsch
authors.forename: F
authors.initials: F
authors.lastname: Tisato
authors.forename: F
authors.initials: F
authors.lastname: Refosco
authors.forename: P
authors.initials: P
authors.lastname: Leibnitz
authors.forename: A
authors.initials: A
authors.lastname: Drews
authors.forename: S
authors.initials: S
authors.lastname: Seifert
authors.forename: H
authors.initials: H
authors.lastname: Spies
mesh_terms: D018360:Crystallography, X-Ray; D008958:Models, Molecular; D008968:Molecular Conformation; D015394:Molecular Structure; D015609:Organotechnetium Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D013329:Structure-Activity Relationship
chemical_list: D015609:Organotechnetium Compounds