The affinity of the vanadyl(IV) ion for nitrogen donor ligands
- Univ. of the Witwaterstand, Johannesburg (South Africa)
The affinity of the VO{sup 2+} ion for nitrogen donor ligands is discussed in terms of predictions made previously. A dual basicity equation predicts logK{sub 1}(NH{sub 3}) = 3.0 for VO{sup 2+}. Equations that model the chelate effect are used to show that this is a reasonable prediction. In accord with experience, the vanadyl ammines should be hydrolyzed in aqueous solution, as should also be the ethylenediamine complexes. The formation constants of VO{sup 2+} with a variety of more hydrolysis-resistant chelating nitrogen donor ligands, 2,2{prime}-bipyridyl, 1,10-phenathroline, o-aminomethyl-pyridine, 2-(2-pyridyl)-imidazole, N,N,N{prime},N{prime}-tetrakis(2-hydroxypropyl)ethylenediamine, di-2-pyridyl-amine, 2,2{prime},2{double_prime}-terpyridyl, and picolinic acid, are reported, determined by glass electrode potentiometry. It is shown that these formation constants are consistent with the predicted logK{sub 1}(NH{sub 3}) for VO{sup 2+}, supporting the validity of the dual basicity equation use. 22 refs., 6 figs., 1 tab.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 88725
- Journal Information:
- Journal of Coordination Chemistry, Vol. 31, Issue 2; Other Information: PBD: 1994
- Country of Publication:
- United States
- Language:
- English
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