X-band electron paramagnetic resonance spectra of imidazolate-bridged copper(II)-copper(II) and copper(II)-zinc(II) complexes of glycylvaline
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چکیده
X-band EPR spectra of imidazol ate-bridgcd [(glyval)Cu-im-Cu-(glyvai)]Na and [(glyval)Cu-im-Zn(glyvai)]Na,where glyval = glycylvaline, im = imidozolate ion, are described.The EPR and electronic spectra of related mononuclear complexes viz., aquoglycylvalinato copper(ll) and imidazole glycylvalinato copper(ll) are also described. A pH dependent EPR study of frozen 50% aqueous DMSO solution of [(glyvai)Cu-im-Zn(glyval)]Na suggest that the complex is stable in pH range (7.15-9.5). At lower pH (< 7 .15), the imidazolate bridge breaks on the zinc side with decreasing pH value.
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