Two novel symmetric fluorene-based ligands, namely, 2,7-bis(1H-imidazol-1-yl)-9,9-dimethyl-9H-fluorene [L1 or (I), C21H18N4] and 2,7-bis(1H-imidazol-1-yl)-9,9-dipropyl-9H-fluorene (L2), have been used to construct the coordination polymerscatena-poly[[dichloridodicopper(I)(Cu—Cu)]-μ-2,7-bis(1H-imidazol-1-yl)-9,9-dimethyl-9H-fluorene], [Cu2Cl2(C21H18N4)]n, (II), andcatena-poly[[tetra-μ2-chlorido-tetracopper(I)]-bis[μ-2,7-bis(1H-imidazol-1-yl)-9,9-dipropyl-9H-fluorene]], [Cu4Cl4(C25H26N4)2]n, (III). There are three types of C—H...N hydrogen bonds in (I), resulting a two-dimensional network in theabplane, including a chiral helical chain along thebaxis. Compounds (II) and (III) are related one-dimensional polymers. In both, CuIatoms connect the symmetric ligands (L1 orL2) into a one-dimensional chain. In (II), the [CuICl2]−} unit, acting as a co-anion, adheres to the one-dimensional chain through a weak Cu...Cu interaction. However, in (III), the [CuI2Cl4]2−} unit links two different chains into a one-dimensional rope-ladder-type chain. In addition, there are C—H...Cl hydrogen bonds and π–π interactions in the extended structures of (II) and (III), the difference is that the chains in (II) are linked into a two-dimensional network while the chains in (III) are stacked into a three-dimensional framework.
两种新型对称芴基配体,即 2,7-双(1H-咪唑-1-基)-9,9-二甲基-9H-芴[L1 或 (I),C21H18N4]和 2、7-bis(1H-imidazol-1-yl)-9,9-dipropyl-9H-fluorene (L2) 被用来构建配位聚合物catena-poly[[dichloridodicopper(I)(Cu-Cu)]-μ-2、7-双(1H-咪唑-1-基)-9,9-二甲基-9H-芴],[Cu2Cl2(C21H18N4)]n,(II),以及catena-poly[[四-μ2-氯-四氯铜(I)]-双[μ-2、7-bis(1H-imidazol-1-yl)-9,9-dipropyl-9H-fluorene]], [Cu4Cl4(C25H26N4)2]n, (III).(I)中存在三种类型的 C-H...N 氢键,从而在ab 平面上形成一个二维网络,包括沿 b 轴的手性螺旋链。化合物 (II) 和 (III) 是相关的一维聚合物。在这两种化合物中,CuI 原子将对称配体(L1 或 L2)连接成一维链。在 (II) 中,[CuICl2]-} 单元作为共阴离子,通过微弱的 Cu...Cu 相互作用附着在一维链上。然而,在 (III) 中,[CuI2Cl4]2-} 单元将两条不同的链连接成一条一维绳梯型链。此外,(II)和(III)的扩展结构中还存在 C-H...Cl 氢键和 π-π 相互作用,不同之处在于(II)中的链连接成二维网络,而(III)中的链堆叠成三维框架。