Both organic hydride donors, DH, and the dimers formed by some organic radicals and by some 19-electron organometallic sandwich compounds, D2, have recently been examined extensively as n-dopants for organic semiconductors. This properties of two classes of organometallic DH derivatives – organic DH derivatives with metallocenyl substituents and species obtained by hydride reduction of 18-electron D+ sandwich cations – are discussed and compared to those of the corresponding D2 molecules. 1,3-Dimethyl-2-metallocenyl-2,3-dihydro-1H-benzo[d]imidazoles, Mc-DMBI-H (Mc = ferrocenyl [Fc], ruthenocenyl [Rc]), and 1,3-dimethyl-2-phenyl-1H-benzo[d]imidazolium tetrakis(3,5-bis(trifluoromethyl))borates, Mc-DMBI+BAr'4– (Mc = Fc, Rc), have recently been reported as intermediates in the synthesis of the dimers (Mc-DMBI)2; here their crystal structures are reported and compared to those of related molecules. The solution reactivity of the Mc-DMBI-H derivatives with a fullerene acceptor is similar to that of purely organic aryl-DMBI-H species. Previously reported (exo-H-η4-pentamethylcyclopentadiene)(η5-cyclopentadienyl)metal complexes, M(exo-H-Cp*H)Cp (M = Rh, Ir) and the new (η5-pentamethylcyclopentadienyl)(η5-1,3,5-trimethylcyclohexa-1,3-dien-5-yl)ruthenium, RuCp*(mesH), have also been examined as potential reductants for organic semiconductors; RuCp*(mesH) is particularly reactive, affording the radical anions of perylene diimide and 6,13-bis(tri(isopropyl)silylethynyl)pentacene. The electrochemistry of DH, D+, and D2 species is compared for the five compounds. Density-functional theory calculations are used to gain insight into the trends in electrochemistry and reactivity.
|Number of pages||11|
|Journal||Inorganica Chimica Acta|
|State||Published - Apr 1 2019|
Bibliographical noteFunding Information:
We thank the NSF for support through the MRSEC program (DMR-0820382), the PREM program (DMR-0934212 and DMR-1523611), DMR-1305247, and DMR-1807797. The work at the University of Kentucky was supported by the Department of the Navy, Office of Naval Research Young Investigator Program, ONR YIP Award No. N00014-18-1-2448. Supercomputing resources on the Lipscomb High Performance Computing Cluster were provided by the University of Kentucky Information Technology Department and Center for Computational Sciences (CCS).
© 2019 Elsevier B.V.
- Hydride donor
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry