| Autor: |
Collison, David, E. Mabbs, Frank, S. Turner, Scott, K. Powell, Anne, J. L. McInnes, Eric, J. Yellowlees, Lesley |
| Zdroj: |
Journal of the Chemical Society, Dalton Transactions; January 1997, Vol. 1997 Issue: 7 p1201-1204, 4p |
| Abstrakt: |
The complex [(Hdmpz){HB(dmpz)3}VO(-η5-C 5H4CO2)Fe(η5-C5 H5)] 1 (Hdmpz = 3,5-dimethylpyrazole) has been synthesized and its spectroscopic properties and crystal structure determined. It crystallizes in the triclinic space group P1&cmb.macr;, with a = 10.563(2), b = 12.460(4), c = 13.028(5) Å, α = 95.16(3), β = 98.93(2), γ = 99.59(2)° and Z = 2. The vanadium(IV) ion is in a distorted-octahedral environment with nitrogen atoms of the borate ligand occupying three facial sites and the other sites by an oxo group, an oxygen atom from the ferrocenecarboxylate, and a nitrogen atom from a neutral Hdmpz. The cyclic voltammogram in CH2Cl2 showed two oxidations at +0.70 and +1.41 V vs. Ag–AgCl, which are completely reversible at -30 °C. The first corresponds to oxidation of the ferrocenecarboxylate moeity, giving 1+. The reversibility of 1 → 1+ has also been demonstrated by electronic absorption and EPR resonance spectroscopies. Complex 1 is EPR active giving spectra as expected from an isolated vanadium(IV) centre, whilst 1+ is EPR silent. |
| Databáze: |
Supplemental Index |
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