The Temperature-Variable Geometry of the Pseudo-Octahedral Cu06 Entity in Bis(methoxyacetato)diaquo-Copper(II) - a Single Crystal EPR Study
نویسندگان
چکیده
The Cu —O bond lengths in the pseudooctahedral bis(methoxyacetato)diaquo-copper(II) com plex are determined by the Jahn-Teller effect on the one hand and by the bonding properties of the three different oxygen ligator atoms (from a carboxylate. water and ether group) on the other. It is derived from EPR single crystal and powder investigations between 4.2 and 350 K, that the system becomes fluxional above —120 K due to a continuous transition from a static to a (par tially) dynamic Jahn-Teller distortion. A model is presented, which allows to correlate the EPR results with the Cu—O spacings, if they are calibrated with structural data at two different temperatures. The structure of the ground state potential surface of Cu2+ is derived from the spectroscopic data.
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