Complexes of the type [Ru(H2bibzim)(R-bpy)2X2·nH2O (R = H, 2,2′-bipyridine, bpy, X = CF3SO3−1; R = Me, 4,4′-dimethyl-2,2′-bipyridine, dmbpy, X = PF6−2; R = tert-butyl, 4,4′-di-tert-butyl-2,2′-bipyridine, tbbpy, X = Cl−3; H2bibzim = 1,1′-bibenzimidazole) containing two NH functions acting as hydrogen bond donors formed different spatially highly organised supramolecular assemblies with water. X-Ray investigation revealed that the nature of the counter ion influences the hydrogen bonding pattern and extent of spatial organisation. In 2 one dimensional chains of hydrogen bonded water could be found. In the deprotonated complex [Ru(bibzim)(tbbpy)2] 4 water molecules serve as hydrogen bond donors. The diastereomeric forms 5a/5b of the homodinuclear ruthenium complex [Ru(tbbpy)2}2(bibzim)][PF6]2 could be separated. No differences in their photophysical properties could be detected. The X-ray investigation of 5a and [Ru(bpy)2}2(bibzim)][PF6]26 showed little influence of peripheral substitution on structural properties. Complexes 3–5 exhibit activity in electrochemical CO2 reduction which can be tuned by variation of the degree of protonation of the bibenzimidazole.
[Ru(H2bibzim)(R-bpy)2X2·nH2O (R = H,
2,2'-联吡啶, bpy, X = CF3SO3−1; R = Me, 4,4'-二甲基-2, 2′-联
吡啶,dmbpy,X=PF6−2;R=叔丁基,4,4′-二叔丁基-2,2′-联
吡啶,tbbpy,X=Cl−3; '-联
苯并咪唑)含有两个作为氢键供体的NH官能团,与
水形成不同的空间高度组织的超分子组装体。 X 射线研究表明,反离子的性质影响氢键模式和空间组织的程度。在2个一维链中可以发现氢键
水。在去质子化复合物 [Ru(bibzim)(tbbpy)2] 4 中,
水分子充当氢键供体。可以分离同双核
钌配合物 [Ru(tbbpy)2}2(bibzim)][PF6]2 的非对映体形式 5a/5b。未检测到它们的光物理特性存在差异。 5a 和 [Ru(bpy)2}2(bibzim)][PF6]26 的 X 射线研究显示外围取代对结构性质的影响很小。配合物 3-5 表现出电
化学 CO2 还原活性,可通过联
苯并咪唑质子化程度的变化进行调节。