A series of coordination polymers based on flexible 5-carboxy-1-(4 '-carboxybenzyl)-2-oxidopyridinium and structurally related N-donor ligands: syntheses, structures and photoluminescent properties

作者：Zhang, Yun-Xue; Yang, Jin^*; Kan, Wei-Qiu; Ma, Jian-Fang

来源：CrystEngComm, 2012, 14(18): 6004-6015.

DOI：10.1039/c2ce25439e

• METAL-ORGANIC FRAMEWORKS
• TOPOLOGICAL STRUCTURES
• CRYSTAL-STRUCTURES
• AROMATIC POLYCARBOXYLATE
• BIS(IMIDAZOLE) LIGANDS
• WATER CLUSTERS
• ACID SYNTHESES
• COMPLEXES
• 2D
• 4,4'-BIPYRIDINE

Seven new coordination polymers, namely, [Zn(L)(biim-4)]center dot 3H(2)O (1), [Co(L)(biim-4)(0.5)] (2), [Zn(L)(btpy)]center dot 1.75H(2)O center dot 0.25EtOH (3), [Co(L)(btpy)] (4), [Cd(L)(phen)(H2O)]center dot H2O (5), [Cd-3(L)(2)(OH)(2)(btb)(H2O)(2)] (6), and [Pb(L)(H2O)(0.5)] (7) (where H2L = 5-carboxy-1-(4'-carboxybenzyl)-2-oxidopyridinium, biim-4 = 1,1'-(1,4-butanediyl)bis (imidazole), btb = 1,2-bis(1,2,4-triazole-1-yl)ethane, phen = 1,10-phenathroline, and btpy = 2-(4-(4'-tert-butylphenyl)-6-(pyrindin-2-yl)pyri-din-2-yl)pyridine) have been synthesized under hydrothermal conditions. Compound 1 shows an unusual 2D -> 2D interdigitated double layer formed by pi-pi interactions. Compound 2 reveals a 3D 6-connected framework with the (4(3).6(11).8) topology. Compounds 3 and 4 are isomorphous and exhibit the same 1D chain structures, which are further extended into a 2D supramolecular layer by hydrogen-bonding and pi-pi interactions. Compound 5 displays a 0D dimeric molecular structure, which is further linked by intermolecular hydrogen-bonding interactions to form a 2D supramolecular layer. Compound 6 shows a 2D layer structure. Intermolecular hydrogen-bonding interactions extended the 2D layers into a 3D supramolecular architecture. Compound 7 exhibits a 2D undulated (4,4) network. The complexes were structurally characterized by single-crystal X-ray diffraction analyses, thermogravimetric analyses (TGA), elemental analyses, powder X-ray diffraction (PXRD) and infrared spectra (IR). The coordination modes of the H2L ligand, the effects of the central metals and the N-donor ligands on the structures of coordination polymers have been discussed in detail. Furthermore, the luminescent properties of compounds 1, 3, 5 and 6 have also been studied.

• 出版日期2012
• 单位东北师范大学