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Journal of Coordination Chemistry
Year: 2008  |  Volume: 61  |  Issue: 15  |  Page No.: 2413 - 2421

Synthesis and crystal structures of two metal-nitroxide complexes including a phenanthroline-substituted nitroxide radical

Dong-Zhao Gao, Ya-Qiu Sun, Dai-Zheng Liao, Zong-Hui Jiang and Shi-Ping Yan    

Abstract: Two metal-nitroxide complexes, [Cu(IMPhenCOO)(CH3OH)]2 · (NO3)2 (1) and [Co(NIT2Py)(H-2,5-PDA)2] · 0.5CH3OH · 2H2O (2) (IMPhenCOOH = 2-carboxyl-9-(4,4,5,5-tetramethylimidazoline-1-oxyl-2-yl)-1,10-phenanthroline, NIT2Py = 2-(2'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide and H2-2,5-PDA = pyridine-2,5-dicarboxylic acid), have been synthesized and structurally characterized by X-ray diffraction. Complex 1 exists as discrete binuclear molecules and each copper(II) is five-coordinate with one tridentate radical ligand (IMPhenCOOH), the other radical ligand through one carboxyl oxygen and one methanol molecule. Complex 1 is the first structurally characterized complex containing the phenanthroline-substituted nitroxide radical. In 2, the Co(II) is six-coordinate with one radical ligand (NIT2Py) and two bidentate pyridine-2,5-dicarboxylate anions.

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