Investigation of K-edge absorption spectra of vanadium coordination compounds |
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| Institution: | 1. Department of Agriculture, University of Naples Federico II, Via Università 100, Portici, NA 80055, Italy;2. Department of Chemical Sciences, University of Naples Federico II, Via Cintia 21, 80126 Napoli, Italy;3. Deparment of Chemistry and Biology, University of Salerno, Via G. Paolo II 132, 84084 Fisciano, SA, Italy;4. Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, SA, Italy;5. Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, SA, Italy |
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| 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: (NH4)3VO2(ox)2]·2H2O, (NH4)2 VO(ox)2H2O]·H2O, Na3VO2(EDTA)]·9H2O, Na2VO(EDTA)]·3H2O, NaV(EDTA)]·3H2O, Na3V2O3(NTA)2]·6H2O, BaVO(NTA)H2O]2·2H2O and Na3V(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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