Том 56, № 4 ЖУРНАЛ СТРУКТУРНОЙ ХИМИИ Июль КРАТКИЕ СООБЩЕНИЯ UDC 541.6:547.13:546.57 CRYSTAL STRUCTURE OF A 3D Ag(I) COORDINATION POLYMER BASED ON FLEXIBLE BIS(BENZIMIDAZOLE) AND 5-NITROISOPHTHALIC ACID CO-LIGANDS X. Zhang, L. Liu, L. Qin, G.H. Cui College of Chemical Engineering, Hebei United University, Tangshan, Hebei Province, P. R. China E-mail: tscghua@126.com Received June, 24, 2014 A new coordination polymer {[Ag4(L)3(nip)2](H2O)}n (L = 1,4-bis(5,6-dimethylbenzimidazol1-yl)butane, H2nip = 5-nitroisophthalic acid) is hydrothermally synthesized and structurally characterized by single crystal X-ray diffraction. <...> The complex features a 3D sqc117 supramolecular framework based on unique tetranuclear Ag(I) clusters which involve the ligandsupported Ag—Ag interactions. <...> The rational and controllable synthesis of promising coordination networks and supramolecular architectures are still a difficult challenge in most cases [ 1—3]. <...> As we know, apart from adopting multidentate and symmetric ligands as building blocks to construct these high-dimensional networks via the coordination-covalent bonding, the hydrogen bonds π—π stacking interaction [ 4, 5 ], and other weak interactions are also employed to increase their dimensionality. <...> The weak Ag ⋯ Ag interaction [ 6, 7 ] can be either ligand-supported [ 8, 9 ] or ligand-unsupported [ 10, 11 ] by the assistant ligands, and its length is comparable to a weak hydrogen bond [ 12 ]. <...> The assembly of silver-organic coordination polymers have been a rapidly considerable research field [ 13, 14 ]. <...> This stems not only from their potential applications as functional materials, but also from their intriguing variety of molecular architectures and topologies [ 15 ]. <...> The 1,4-bis(5,6-dimethylbenzimidazol-1-yl)butane (L) ligand with the aliphatic core and the benzimidazole motif has remarkable features: (i) the nitrogen atoms of bis(benzimidazole) ligands have strong coordination ability and the —(CH2)n-group is flexible [ 16—18]; (ii) the ligand contains both imidazole ring and larger conjugated π-system, capable of acting as hydrogen bond donors and for π—π stacking interaction. <...> In continuation of our previous works [ 19 ], we report the synthesis and crystal structure of a new 3D supramolecular <...>