Ni(II), Co(II) and Mn(II) tris(pyrazolyl)borate complexes with 2,6-di-tert-butyl-4-carboxy-phenol were synthesized and characterized crystallographically (Ni and Co complexes), spectroscopically and electrochemically. It was found that oxidation of Ni and Co complexes resulted in the formation of coordinated phenoxyl radical and diphenoquinone, whereas only quinone formed in the case of Mn complex and free 2,6-di-tert-butyl-4- carboxy-phenol. © 2005 Elsevier B.V. All rights reserved.
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