ligand ratio). Compounds 1, 2 and 4 contain bis(carboxylate)-bridged dinuclear motifs as secondary building units (SBUs). In 1 and 2 the SBUs are connected into 44 layers by bis(chelating) nbpdc and pairwise bipy linkers. In 1, the layers are pillared into a 3D framework with the pcu topology by Hnbpdc, which is coordinated to one layer and hydrogen-bonded to another layer. In 2, the layers and the linear
四种配位聚合物,[Co 2(Hnbpdc)2(nbpdc)(bipy)2 ] n(1),[Co 3(nbpdc)3(bipy)3(H 2 O)2 ] n ·2 n H 2 O(2),[Co 4(nbpdc)4(bipy)(H 2 O)4 ] n(3)和[Co 2(nbpdc)2(bpee)3/2 ] n ·0.25 n H 2O(4)[H 2 nbpdc =
2-硝基联苯-4,4'-二
羧酸, 比比 =
4,4'-联吡啶 和bpee = 1,2-二(4-
吡啶基)
乙烷通过
水热法合成了[α],并通过X射线晶体学,拓扑分析和磁分析进行了研究。化合物1-3是在控制条件下(pH和
配体比率)由相同的反应物合成的。化合物1,2和4含有双(
羧酸盐)-bridged双核基序作为次级结构单元(的SBU)。在1和2中,SBU通过bis(螯合)nbpdc和成对的bipy连接器连接成4 4层。在图1中,各层通过Hnbp