Synthesis and Oxidation of Dirhenium C 4 , C 6 , and C 8 Complexes of the Formula (η 5 -C 5 Me 5 )Re(NO)(PR 3 )(C⋮C) n (R 3 P)(ON)Re(η 5 -C 5 Me 5 ) (R = 4-C 6 H 4 R‘, c-C 6 H 11 ): In Search of Dications and Radical Cations with Enhanced Stabilities †
- Award ID(s):
- 9732605
- Publication Date:
- NSF-PAR ID:
- 10164612
- Journal Name:
- Organometallics
- Volume:
- 20
- Issue:
- 6
- Page Range or eLocation-ID:
- 1115 to 1127
- ISSN:
- 0276-7333
- Sponsoring Org:
- National Science Foundation
More Like this
-
The reduction potentials (reported vs. Fc + /Fc) for a series of Cp′ 3 Ln complexes (Cp′ = C 5 H 4 SiMe 3 , Ln = lanthanide) were determined via electrochemistry in THF with [ n Bu 4 N][BPh 4 ] as the supporting electrolyte. The Ln( iii )/Ln( ii ) reduction potentials for Ln = Eu, Yb, Sm, and Tm (−1.07 to −2.83 V) follow the expected trend for stability of 4f 7 , 4f 14 , 4f 6 , and 4f 13 Ln( ii ) ions, respectively. The reduction potentials for Ln = Pr, Nd, Gd, Tb, Dy, Ho, Er, and Lu, that form 4f n 5d 1 Ln( ii ) ions ( n = 2–14), fall in a narrow range of −2.95 V to −3.14 V. Only cathodic events were observed for La and Ce at −3.36 V and −3.43 V, respectively. The reduction potentials of the Ln( ii ) compounds [K(2.2.2-cryptand)][Cp′ 3 Ln] (Ln = Pr, Sm, Eu) match those of the Cp′ 3 Ln complexes. The reduction potentials of nine (C 5 Me 4 H) 3 Ln complexes were also studied and found to be 0.05–0.24 V more negative than those of the Cp′more »