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In the crystallographically characterized macrocyclic complex [Cu2L(MeCN)2][F3CSO3]4·2 MeCN the copper ions adopt a highly distorted five-coordinate geometry; relaxation to a more regular octahedral geometry on incorporation of a bridging substrate is demonstrated by the structure of [Cu2L(µ-CN)(MeCN)2][ClO4]3.
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Warzeska et al. (1996) studied this question.
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