EPR studies of the electronic structure and dynamic Jahn-Teller effect in cobalt(II) mixed-sandwich compounds

B. L. Ramakrishna, A. K. Salzer, U. Ruppli, J. H. Ammeter, U. Kölle

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Abstract

EPR studies are reported on the 19-electron sandwich complex Co(Cp)(Bz)+ ((η5C5H5)Co(η6C 6H6)+) and some of its ring-methylated derivatives in several diamagnetic host lattices and frozen solutions. The results are consistent with a d7 configuration for cobalt with the unpaired electron in the e1g orbital having largely metal (dxz,dyz) character. The dependence of the EPR parameters on the host lattice is mainly attributed to the rhombic splitting caused by the unsymmetrical host lattice potential acting on the dynamically Jahn-Teller-coupled 2π ground state. The bonding parameters have been compared with those of analogous compounds with the covalency decreasing as Ni(Cp)2 + > Co(Pmcp)(hmBz)+ > Co(cp)(Bz)+ > Co(Cp)2 + > Fe(cp)(Bz). The variation of line width with temperature has been used to derive information on the energy of the first excited Kramers doublet.

Original languageEnglish (US)
Pages (from-to)1364-1368
Number of pages5
JournalInorganic Chemistry
Volume25
Issue number9
StatePublished - 1986

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Jahn-Teller effect
Cobalt
Electronic structure
Paramagnetic resonance
cobalt
electronic structure
Electrons
Linewidth
Ground state
Metals
Derivatives
electrons
orbitals
ground state
rings
configurations
metals
Temperature
temperature
energy

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Ramakrishna, B. L., Salzer, A. K., Ruppli, U., Ammeter, J. H., & Kölle, U. (1986). EPR studies of the electronic structure and dynamic Jahn-Teller effect in cobalt(II) mixed-sandwich compounds. Inorganic Chemistry, 25(9), 1364-1368.

EPR studies of the electronic structure and dynamic Jahn-Teller effect in cobalt(II) mixed-sandwich compounds. / Ramakrishna, B. L.; Salzer, A. K.; Ruppli, U.; Ammeter, J. H.; Kölle, U.

In: Inorganic Chemistry, Vol. 25, No. 9, 1986, p. 1364-1368.

Research output: Contribution to journalArticle

Ramakrishna, BL, Salzer, AK, Ruppli, U, Ammeter, JH & Kölle, U 1986, 'EPR studies of the electronic structure and dynamic Jahn-Teller effect in cobalt(II) mixed-sandwich compounds', Inorganic Chemistry, vol. 25, no. 9, pp. 1364-1368.
Ramakrishna, B. L. ; Salzer, A. K. ; Ruppli, U. ; Ammeter, J. H. ; Kölle, U. / EPR studies of the electronic structure and dynamic Jahn-Teller effect in cobalt(II) mixed-sandwich compounds. In: Inorganic Chemistry. 1986 ; Vol. 25, No. 9. pp. 1364-1368.
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