Near neighbour ligand hyperfine splittings in the e.p.r. spectra of copper(II) complexes

Autor: Prabhanada, Bala S., Braganza, O’Neil P., Kombrabail, Mamata H., Baratova, Zebo R., Solozhenkin, Piotr M.
Zdroj: Transition Metal Chemistry; December 1992, Vol. 17 Issue: 6 p552-556, 5p
Abstrakt: X-band e.p.r. spectra from mixed ligand complexes Cu(btc)-(Hy), Cu(TPA)(Hy) and Cu(Sal)(TPA), have been derived from the spectra of suitable reaction mixtures in CHCl3at 25° C (Sal−= salicyladehydate, TPA−= thiopicolineanilide, Hy−= 8-hydroxyquinolinate and btc−=N-benzoyl-N′N′-diethylcarbamide). A digital data acquisition instrument and a personal computer were used for this purpose. The14N hyperfine splittings observed in these complexes have shown that the observed increase in spin density on the coordinating atoms of one ligand, at the expense of that on the other, is unlikely to be associated with the covalent bonding involving metal dx2−y2-orbital. Covalent bonding involving metal 4s-orbital component of the unpaired electron orbital has been suggested to be responsible for the observed changes in electron delocalization.
Databáze: Supplemental Index
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