Transition metal hydrides as ligands

• Published in: Coordination chemistry reviews Vol. 200; pp. 687 - 715
• Main Authors: Albinati, Alberto, Venanzi, Luigi M
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2000
• Subjects: Bi-, tri-, and hexametallic complexes; Hydrido-bridged complexes; Hydrido-bridged complexes; Bi-, tri-, and hexametallic complexes
• ISSN: 0010-8545; 1873-3840
• DOI: 10.1016/S0010-8545(00)00257-5

The characterization of [(PPh 3) 3IrH 3AgH 3Ir(PPh 3) 3](CF 3SO 3) is reviewed. The structural and spectroscopic properties of [(tripod)MH 3M′H 3M(tripod)](CF 3SO 3) (tripod=CH 3C(CH 2PPh 2) 3, CH 3C(CH 2AsPh 2) 3; M=Rh, Ir; M′=Cu(I), Ag(I), Au(I), Cd(II)) are also reviewed. It is pointed out that (a) in the Cu(I) and Ag(I) species, each trihydride forms one stronger and one weaker MHM′HM interaction, (b) in the Au(I) species the trimetallic units are held together mainly by MAuM bonds and (c) in the Cd(II) species this cation may weakly interact with all six hydrides. Qualitative bonding schemes describing the MHM′HM interactions are presented. The formation and properties of the hydrido-bridged heterobimetallic complexes of the type [(tripod)MH 3M′L n ](CF 3SO 3) (tripod=as above; M=Rh, Ir; M′=Cu(I), Ag(I), Au(I), L=PR 3) are summarized. The structural features of the hexametallic complexes [{(CH 3C(CH 2PPh 2) 3)MH 3M′} 3](CF 3SO 3) 3 (M=Rh, Ir; M′=Cu(I), Ag(I), Au(I)) are reviewed.