(1,2-Ethanediyliden)-bis( S -methylhydrazonecarbodithionate) ligands 1a − g form zinc chelates with [ZnN 2 S 2 ] units, as shown by means of IR, NMR, XPS, X-ray crystal structure analysis, and Zn and N K-edge XANES. The conformation of ligands 1a − g strongly determines the structure of the corresponding zinc complexes 2a − g . Powder samples of these complexes were studied by Zn K-edge XANES. The Zn K-edge XANES results agree with those of X-ray crystal structure data, when available. A tetrahedral ligand environment was confirmed for only one complex ( 2a ). The other zinc chelates ( 2b − g ) show dimeric structures with square pyramidal complex geometry. With pyridine, five-coordinated zinc complexes 3a − c form, as shown by Zn K-edge XANES in comparison with X-ray crystal structure data. XANES studies afford considerable advantage for obtaining structural information, in particular when crystals of sufficient quality cannot readily be obtained.
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Hennig et al. (1998) studied this question.
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