Jahn-Teller effect noncooperative

In these molecular type lattices the structure of the CuN402 chromophore is independent of the structure of the host lattice, and the effect is referred to as the noncooperative Jahn-Teller effect.514 It applies to the vast majority of low symmetry copper(II) complexes involving organic type ligands, but even here cooperative effects that influence the ESR properties, such... 

The above account of copper(II) stereochemistry and electronic properties (Sections 53,4 and 53.4.4) establishes the uniqueness of the regular octahedral (and trigon octahedral) stereochemistries and the novel temperature variability of this stereochemistry (Sections 53.4.2.li and x) and the corresponding ESR spectra. " In order to understand these properties it is necessary to examine the Jahn-Teller theorem in a little more detail, as the consequences of this theorem extend beyond the above two topics and will cover the following (i) temperature variable (fluxional) copper(II) pseudo stereochemistries (ii) non temperature variable, static copper(II) stereochemistries (iii) the plasticity effect and varying tetragonal distortions (iv) the second order Jahn-Teller effect " and (v) the cooperative" and noncooperative " Jahn-Teller effects. For this reason the application of the Jahn-Teller theorem to the coordination chemistry of the copper(II) ion will be described" " and extended to the above topics." " " ... 

In order to understand the ferromagnetic order that is sometimes found in perovskites containing 3d4 ions, it is necessary to investigate the effect of Jahn-Teller stabilizations when there is no static, cooperative distortion of the entire lattice. Lack of a static Jahn-Teller stabilization may indicate either (1) noncooperative, static distortions or (2) removal of the ground-state degeneracy by resonance between... 

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