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

doi:10.1021/ic00229a014

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

Engineering of Matter, Transport and Energy, School for (IAFSE-SEMTE)

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Abstract

EPR studies are reported on the 19-electron sandwich complex Co(cp)(Bz)₊ 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 e_lgorbital having largely metal 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 ground state. The bonding parameters have been compared with those of analogous compounds with the covalency decreasing as Ni(cp)₂₊ > > 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 language	English (US)
Pages (from-to)	1364-1368
Number of pages	5
Journal	Inorganic chemistry
Volume	25
Issue number	9
DOIs	https://doi.org/10.1021/ic00229a014
State	Published - 1986

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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title = "EPR Studies of the Electronic Structure and Dynamic Jahn-Teller Effect in Cobalt(II) Mixed-Sandwich Compounds",

abstract = "EPR studies are reported on the 19-electron sandwich complex Co(cp)(Bz)+ 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 elgorbital having largely metal 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 ground state. The bonding parameters have been compared with those of analogous compounds with the covalency decreasing as Ni(cp)2+ > > 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.",

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T1 - EPR Studies of the Electronic Structure and Dynamic Jahn-Teller Effect in Cobalt(II) Mixed-Sandwich Compounds

AU - Ramakrishna, B. L.

AU - Salzer, A. K.

AU - Ruppli, U.

AU - Ammeter, J. H.

AU - Kölle, U.

PY - 1986

Y1 - 1986

N2 - EPR studies are reported on the 19-electron sandwich complex Co(cp)(Bz)+ 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 elgorbital having largely metal 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 ground state. The bonding parameters have been compared with those of analogous compounds with the covalency decreasing as Ni(cp)2+ > > 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.

AB - EPR studies are reported on the 19-electron sandwich complex Co(cp)(Bz)+ 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 elgorbital having largely metal 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 ground state. The bonding parameters have been compared with those of analogous compounds with the covalency decreasing as Ni(cp)2+ > > 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.

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EPR Studies of the Electronic Structure and Dynamic Jahn-Teller Effect in Cobalt(II) Mixed-Sandwich Compounds

Abstract

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