Anomalous solution behaviour of isomorphous complexes of zirconium- and hafnium-(IV)

D F EVANS, G W GRIFFITHS, C OMAHONEY, D J WILLIAMS, C Y WONG, J D WOOLLINS

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13 Citations (Scopus)

Abstract

The synthesis of [Zr(IV)(egta)] and [Hf(IV)(egta)] in aqueous solution, where H-4egta = ethylenedioxydiethyl-enedinitrilotetraacetic acid, is reported. The eight-co-ordinate complexes have been characterised by X-ray crystallography, H-1 NMR spectroscopy, mass spectrometry and elemental analysis. The two compounds are isostructural in the solid state. Solution studies by H-1 NMR spectroscopy show that the hafnium analogue has a higher degree of symmetry. In particular, the spectrum of the zirconium complex reveals all of the methylene groups to be inequivalent whereas in the hafnium complex the -N (CH2CO2)2- and the -NCH2CH2O- methylene groups show increased magnetic equivalence.

Original languageEnglish
Pages (from-to)2475-2479
Number of pages5
JournalJournal of the Chemical Society, Dalton Transactions
Issue number16
DOIs
Publication statusPublished - 21 Aug 1992

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