Testing Bridge-Mediated Differences in Dinuclear Valence Tautomeric Behavior

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• 作者：Sofi Bin-Salamon ; Scott H. Brewer ; Ezra C. Depperman ; Stefan Franzen ; Jeff W. Kampf ; Martin L. Kirk ; R. Krishna Kumar ; Simon Lappi ; Katrina Peariso ; Kathryn E. Preuss ; and David A. Shultz
• 刊名：Inorganic Chemistry
• 出版年：2006
• 出版时间：May 29, 2006
• 年：2006
• 卷：45
• 期：11
• 页码：4461 - 4467
• 全文大小：209K
• 年卷期：v.45,no.11(May 29, 2006)
• ISSN：1520-510X

文摘

Two structurally characterized dinuclear valence tautomers are described. Cobalt ions are bridged by p- andm-phenylene units connected to 2,2'-bipyridines. X-ray crystal structures show that the molecules are in the [(Co^III)(Co^III)] forms at ca. 125 K, while spectroscopic studies show that both molecules can achieve the [(Co^II)(Co^II)] formabove 400 K and confirm the [(Co^III)(Co^III)] form below 10 K. Magnetic susceptibility studies are also included. Ourresults highlight the necessity of studying both crystalline and amorphous samples to distinguish the effects ofintrinsic electronic structure and intermolecular forces on valence tautomeric behavior.