Synthesis and reactivity of technetium(VII) imido complexes
1993; Elsevier BV; Volume: 12; Issue: 14 Linguagem: Inglês
10.1016/s0277-5387(00)84611-2
ISSN1873-3719
AutoresJeffrey C. Bryan, Anthony K. Burrell, Mary M. Miller, Wayne H. Smith, Carol J. Burns, Alfred P. Sattelberger,
Tópico(s)Radioactive element chemistry and processing
ResumoThe synthesis, characterization and electrochemistry of a series of new technetium complexes, Tc(NAr)3X and Tc(NAr′)3X (X = OSiMe3, alkyl, I), is reported. These complexes are shown to be resistant to reduction and moderately air-sensitive. The siloxy complex Tc(NAr)3(OSiMe3) (1a) reacts with fluoride ion to give the tris(imido)oxo anion [TcO(NAr)3]−. Less sterically hindered M(Nar′)3(OSiMe3) complexes react with Ar′NCO in a net [2+2] fashion to give the urylene complexes M(NAr′)2(NAr′C(O)NAr′) (OSiMe3) (2a, M = Tc; 2b, M = Re). The X-ray crystal structures of 1a, 2b and (Tc(NAr)3I (4a) suggest that the imido ligands moderate their level of electron donation to reflect the electronic requirements of the metal and the ancillary ligands.
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