Abstract
A proton ENDOR study has been made of VO 2+ in frozen aqueous solution, and in Zn(NH 4) 2(SO 4) 2·6H 2O powder. The study establishes that the vanadyl ion is particularly well suited for ENDOR investigations of binding site structure. Powder and frozen solution samples give ENDOR signals at temperatures well above 77 K, and using moderate microwave and rf power levels. ENDOR signals of VO 2+ in frozen solution and in powder are virtually identical, establishing the structure of the aquo complex in frozen solution. Information on ligand hyperfine splitting components derived from the spectra given an insight into the electronic as well as the geometric structure.
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