Electronic structure, Jahn–Teller dynamics and electron spin relaxation of two types of octahedral Cu(ii) complexes in cadmium formate dihydrate Cd(HCOO)₂·2H₂O. EPR and ESE studies

Electronic structure and dynamics of low symmetry Cu2+ complexes in kainite-type crystal KZnClSO4·3H2O: EPR and ESE studies

“…However, it tends to an averaged value lower than the expected ðA 0 z þ A 0 x Þ=2 value. We have observed a similar behavior for Cu 2+ in other crystals with the dynamical Jahn-Teller effect [27][28][29][30]. From Eq.…”

“…12. Application of the Silver-Getz model to Cu 2+ complexes in Tutton salts [25,26] and in Cd(HCOO) 2 Á2H 2 O [27] confirms that the d 12 varies with temperature suggesting restricted validity of the model.…”

Magnetic anisotropy of the spin tetramer systemSeCuO3studied by torque magnetometry and ESR spectroscopy

“…In principle, it can be a consequence of the structural changes of the ligand surrounding of the magnetic ion or a dynamic Jahn-Teller distortion. 28,29 However, no significant temperature change of the crystal structure of SeCuO 3 was observed in the temperature range 80-300 K. 13 The possibility of a dynamic Jahn-Teller distortion and freezing of the system in some configuration with lowest energy at low temperatures can not be excluded. Dynamic Jahn-Teller effect is a reason behind temperature change of the g tensor observed in CuSb 2 O 6 where a crossover takes place from hightemperature tetragonal to low-temperature monoclinic crystal structure in a wide temperature range finally resulting in the freezing of the system below ≈ 200 K. 30 When CuSb 2 O 6 crystal structure freezes, the crystal usually ends up having several twins due to several possibilities for the orientation of CuO 6 octahedra.…”

Growth, EPR and optical absorption spectra of l-threonine single crystals doped with Cu2+ ions

“…The eigenvalues of the g and A Cu tensors given in Table 1 for the case of L-thr:Cu 2+ indicate an electronic ground orbital state d ðx 2 Ày 2 Þ for the copper ion [25]. Assuming D 2h point symmetry of the crystal field, the wave functions of the Cu 2+ ion can be written as linear combinations of Cu and ligand electronic orbitals [25,26]:…”