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EPR of Two Cu2+ Complexes Showing Dynamic Jahn-Teller Effects

Citation

Hitchman, MA and Simmons, CJ and Stratemeier, H, EPR of Two Cu2+ Complexes Showing Dynamic Jahn-Teller Effects, Applied Magnetic Resonance, 19, (1) pp. 121-131. ISSN 0937-9347 (2000) [Refereed Article]

DOI: doi:10.1007/BF03162266

Abstract

The powder electron paramagnetic resonance spectra of ̃1% Cu doped into [Zn(bipy)2(NO2)]NO3 and [Zn(bipyam)2(NO2)]NO3, bipy = 2,2′-bipyridyl, bipyam = 2,2′-bipyridylamine, over the temperature range 4.2-300 K are reported. For [Zn/Cu(bipy)2(NO2)]NO3 a spectrum characteristic of a tetragonally elongated octahedral complex with a slight orthorhombic distortion is observed below ̃50 K, but above this temperature the signals associated with the two higher g-values gradually converge. At low temperature a spectrum similar to that of the bipy complex is observed for [Zn/Cu(bipyam)2(NO2)]NO3, but between 40 and 60 K the spectrum gradually changes to one characteristic of a tetragonal g-tensor with g∥ < g⊥. The spectra may be interpreted satisfactorily with a model in which the temperature dependence of the g-values is estimated from the vibronic wavefunctions of a copper(II) complex under the influence of second-order Jahn-Teller coupling and a ligand field of tetragonal symmetry perturbed by crystal lattice forces. The results are consistent with the crystal structures reported for the compounds at various temperatures. © Springer-Verlag 2000.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Inorganic Chemistry
Research Field:Transition Metal Chemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Hitchman, MA (Dr Michael Hitchman)
Author:Stratemeier, H (Dr Horst Stratemeier)
ID Code:19098
Year Published:2000
Web of Science® Times Cited:5
Deposited By:Chemistry
Deposited On:2000-08-01
Last Modified:2001-03-26
Downloads:0

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