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Bis(3,5-di-t-butyl-1,2-benzoquinone 1-oximato)copper(II), Cu(ox) 2 , and its mixed-ligand complexes, Cu(ox)L x  [L x  = 8-hydroxyquinolinato (L 1 ), N-Phenyl-salicylaldimine (L 2 ), N-phenyl- 3,5-di-t-butylsalicylaldiminato (L 3 ) and N-(2-hydroxyphenyl)-3,5-di-t-butylsalicyl-aldiminato (L 4 )], were prepared and their spectral behavior as well as redox-reactivity towards PPh 3 , (m-ClC 6 H 4 ) 3 P, (m-CH 3 C 6 H 4 ) 3 P and PPh 2 -(CH 2 ) 4 -PPh 2  studied by analytical and spectroscopic (IR, UV-vis, ESR) techniques and magnetic measurements. Cu(ox) 2  and Cu(ox)L 4  complexes prepared in air show μ ef  values of 2.84 and 3.33 μ B , respectively, and are consistent with an S= 1 and S= 3/2 ground states. Both compounds are formulated as copper(II)-radical complex exhibiting intramolecular ferromagnetic coupling between the orthogonal d x  2  -y  2  magnetic orbital of the Cu II  ion and that of the π-radical ligand.

zeitschrift für naturforschung b

Spectroscopic Studies on Bis(3,5-di-t-butyl-1,2-benzoquinone 1-oximato)copper(II) and its Mixed-Ligand Complexes. Copper(II)-Radical Ferromagnetic Coupling