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Crystal Structures and EPR Spectra of Cu 2+ ‐Doped Magnesium(II) and Cadmium(II) Methoxyacetates
Author(s) -
Hitchman Michael A.,
Hockless David C. R.,
Skelton Brian W.,
Stratemeier Horst,
White Allan H.
Publication year - 2007
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200700288
Subject(s) - electron paramagnetic resonance , carboxylate , magnesium , crystallography , copper , chemistry , crystal structure , cadmium , metal , anhydrous , aqueous solution , spectral line , inorganic chemistry , stereochemistry , nuclear magnetic resonance , physics , organic chemistry , astronomy
Magnesium methoxyacetate crystallizes from aqueous solution as a dihydrate, isomorphous with its nickel(II) and copper(II) counterparts, the six‐coordinate metal atoms being disposed on crystallographic inversion centres in space group P 2 1 / n . The cadmium complex is anhydrous, the six‐coordinate metal atoms being linked into a two‐dimensional polymer parallel to the ab plane in space group P 2 1 / c by bridging coordination through carboxylate oxygen atoms. The powder EPR spectra of traces of Cu 2+ doped into the magnesium(II) and cadium(II) compounds show slight temperature dependences, with the higher two g ‐values converging as the temperature is raised from ∼77 K to 290 K. This is analysed in terms of an equililibrium between complexes having similar geometries, but with the long and intermediate bond directions interchanged. The behaviour is in contrast to that of the pure copper(II) complex, where the thermal properties appear to be influenced by cooperative interactions.