New Dinuclear Nickel(II) Complexes: Synthesis, Structure, Electrochemical, and Magnetic Properties

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• 作者：Dmitry Yakhvarov ; Ekaterina Trofimova ; Oleg Sinyashin ; Olga Kataeva ; Yulia Budnikova ; Peter Lo虉nnecke ; Evamarie Hey-Hawkins ; Andreas Petr ; Yulia Krupskaya ; Vladislav Kataev ; Ru虉diger Klingeler ; Bernd Bu虉chner
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：May 16, 2011
• 年：2011
• 卷：50
• 期：10
• 页码：4553-4558
• 全文大小：910K
• 年卷期：v.50,no.10(May 16, 2011)
• ISSN：1520-510X

文摘

The reaction of [NiBr₂(bpy)₂] (bpy = 2,2鈥?bipyridine) with organic phosphinic acids ArP(O)(OH)H [Ar = Ph, 2,4,6-trimethylphenyl (Mes), 9-anthryl (Ant)] leads to the formation of binuclear nickel(II) complexes with bridging ArP(H)O₂^{鈭?/sup> ligands. Crystal structures of the binuclear complexes [Ni₂(渭-O₂P(H)Ar)₂(bpy)₄]Br₂ (Ar = Ph, Mes, Ant) have been determined. In each structure, the metal ions have distorted octahedral coordination and are doubly bridged by two arylphosphinato ligands. Magnetic susceptibility measurements have shown that these complexes display strong antiferromagnetic coupling between the two nickel atoms at low temperatures, apparently similar to binuclear nickel(II) complexes with bridging carboxylato ligands. Cyclic voltammetry and in situ EPR spectroelectrochemistry show that these complexes can be electrochemically reduced and oxidized with the formation of Ni(I),Ni(0)/Ni(III) derivatives.}