Abstract
High resolution vanadium K-edge spectra (XANES) have been measured using the synchrotron radiation available at the Institute of Nuclear Physics of the Academy of Sciences of the U.S.S.R., Novosibirsk. The compounds investigated include anions of oxalic acid (ox), ethylenediaminetetraacetic acid (EDTA) and nitrilotriacetic acid (NTA) as ligands: (NH 4) 3[VO 2(ox) 2]·2H 2O, (NH 4) 2 [VO(ox) 2H 2O]·H 2O, Na 3[VO 2(EDTA)]·9H 2O, Na 2[VO(EDTA)]·3H 2O, Na[V(EDTA)]·3H 2O, Na 3[V 2O 3(NTA) 2]·6H 2O, Ba[VO(NTA)H 2O] 2·2H 2O and Na 3[V(NTA) 2]. The vanadium oxidation states in these compounds cover the region between +5 and +3. The object of this investigation is to obtain further information about the effect of bonding and coordination geometry on the details of the absorption spectra, especially on the intensity and position of a well defined pre-edge absorption peak in most of the compounds.
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