The coordination chemistry of germanium covers quite bulk fields, as shown by a survey covering the crystallographicand structural data of over two hundred examples. About ten percent of those complexes exist as distortion isomersand are summarised. These are discussed in terms of the coordination around the germanium(I), germanium(II) andgermanium(IV) atoms, and correlations are drawn between donor atoms, bond distances and interbond angles. Distortionisomers differing only by degree of distortion in Ge – L and L – Ge – L angles by far prevail. There is an example, whichcontains within one crystal distortion and coordination isomers, which is rarity.
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