Electronic and Magnetic Communication in Mixed-Valent and Homovalent Ruthenium Complexes Containing Phenylcyanamide Type Bridging Ligands
作者:Muriel Fabre、Jacques Bonvoisin
DOI:10.1021/ja067255i
日期:2007.2.1
Four new phenylcyanamido-bridge dinuclear ruthenium complexes [Ru(tpy)(thd)}2(mu-L)] with tpy = 2,2':6',2' '-terpyridine, thd = 2,2,6,6-tetramethyl-3,5-heptanedione and L = dcbp = 4,4'-dicyanamidobiphenyl; bcpa = bis(4-cyanamidophenyl)acetylene; bcpda = bis(4-cyanamidophenyl)diacetylene; bcpea = 9,10,-bis(4-cyanamidophenylethynyl)anthracene have been prepared and fully characterized. The mixed valent
四种新的苯基氰胺桥双核钌配合物 [Ru(tpy)(thd)}2(mu-L)],tpy = 2,2':6',2''-三联吡啶,thd = 2,2,6, 6-四甲基-3,5-庚二酮和 L = dcbp = 4,4'-二氰氨基联苯;bcpa = 双(4-氰胺基苯基)乙炔;bcpda = 双(4-氰氨基苯基)二乙炔;bcpea = 9,10,-双(4-氰胺基苯基乙炔基)蒽已被制备并充分表征。所有配合物的混合价 Ru(II)Ru(III) 和同价顺磁性 Ru(III)Ru(III) 形式都是电化学生成的,并通过 UV-vis-NIR 和 EPR 光谱进行研究。电子通信通过从近红外区域的间隔测量中提取的电子耦合参数 V(ab) 量化,磁通信通过交换耦合常数 J 量化,当改变温度时,可以从 EPR 信号的强度中获得。获得并讨论了电子和磁耦合与金属间距离的指数衰减。