Abstract
Abstract Complex formation between tungsten and aminopolycarboxylic acids is found to require facial, tridentate orientation of ligand dentates. Coordination of hydroxyl groups is found to result in loss of the hydroxyl proton and formation of a W2O5 core structure. Hydroxyl coordination is found to be only slightly less favored than carboxylate coordination, but the resulting alkoxy bond is much less labile than that of carboxylate. Different coordinating ability is found for the two nitrogens of 1, 2-PDTA and the formation of a ‘proton chelate’ is proposed for this molecule.
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