H-bonding and steric effects on the properties of phenolate and phenoxyl radical complexes of Cu(II).

Galina M Zats, Himanshu Arora, Ronit Lavi, Dmitry Yufit, Laurent Benisvy

Department of Chemistry, Bar-Ilan University, Ramat Gan, 52 900, Israel.

Dalton transactions (Cambridge, England : 2003) 2012 Jan 7

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Herein, the N-R substituted N,O-phenol-pyrazole redox-active pro-ligands, (R)LH (R = Me, Pr) are reported together with their corresponding bis-Cu(R)L(2) complexes (2 and 3, respectively). The latter are reversibly oxidised to the corresponding stable Cu(II)-phenoxyl radical complexes 2(+) and 3(+). The properties of the tetrahedrally distorted complexes 2 and 3 (and those of 2(+) and 3(+)) are being compared to those of the square-planar H-bonded complex 1 (bis-Cu(H)L(2)) and those of 1(+). These studies have permitted H-bonding and steric effects on the redox, spectroscopic and chemical properties of Cu(II)-phenolate and Cu(II)-phenoxyl radical species to be established.

Citation

Galina M Zats, Himanshu Arora, Ronit Lavi, Dmitry Yufit, Laurent Benisvy. H-bonding and steric effects on the properties of phenolate and phenoxyl radical complexes of Cu(II). Dalton transactions (Cambridge, England : 2003). 2012 Jan 7;41(1):47-9