Abstract
The synthesis and crystal structure of a novel copper(ll) halide cluster, (Et4N)8Cu14Cl28O4, is reported. The cluster anion Cu14Cl28O4 8− can be Viewed as being formed by the dimerization of two Cu7Cl14O2 4− fragments. The hypothetical precursor anion of this latter cluster, Cu7Cl15O2 5− in tum can be viewed as being formed from. the known parent Cu7Cl14O2 4− cluster anions by fusion of pairs across a common CuCI3 face. The fusion and dimenzation processes cause substantial distortion of the trigonal bipyramidal coordmation geometry of the copper(II) ions in the parent cluster. For three of the copper(II) ions this Yields a 4+1 geometry distinct from either trigonal blpyramldal or square pyramidal. The dimerization of the two Cu7 clusters forces a severe distortion upon one additional copper(II) ion, this time towards a tetrahedral geometry. The implications of these distortions for the catalytic properties reactivities and magnetic behaviour of the parent complex are discussed.
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