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Original Articles

Two new coordination polymers based on N-heterocyclic carboxylic acids

, , , , , , & show all
Pages 837-846 | Received 13 May 2013, Accepted 09 Jan 2014, Published online: 22 Apr 2014
 

Abstract

Two new coordination polymers, [(Cu2(o-HPIDC)2(H2O)2]n (1) and {[Nd(p-HPIDC)(ox)0.5(H2O)]·2H2O}n (2) (o-H3PIDC = 2-(pyridine-2-yl)-1H-imidazole-4,5-dicarboxylic acid, p-H3PIDC = 2-(pyridine-4-yl)-1H-imidazole-4,5-dicarboxylic acid, H2ox = oxalic acid), have been synthesized under hydrothermal conditions and characterized by elemental and thermogravimetric analyses (TGA), infrared spectroscopy, and single-crystal X-ray diffraction. In 1, o-HPIDC2− ligands link Cu(II) centers into infinite 1-D chains that are stabilized by hydrogen bonds and π···π stacking interactions into a 3-D supramolecular architecture. In 2, ox2− ligands link the 2-D [Nd(p-HPIDC)]n layers into a (4·82)(4·85) 3-D network structure featuring two pairs of left-handed and right-handed helical chains. TGA of 1 and 2 are presented. In addition, the fluorescence properties of 2 have been studied in the solid state at room temperature.

Graphical Abstract

Two new coordination polymers, [(Cu2(o-HPIDC)2(H2O)2]n (1) and {[Nd(p-HPIDC)(ox)0.5(H2O)]·2H2O}n (2) (o-H3PIDC = 2-(pyridinium-2-yl)-1H-imidazole-4,5-dicarboxylic acid, p-H3PIDC = 2-(pyridinium-4-yl)-1H-imidazole-4,5-dicarboxylic acid, H2ox = oxalic acid), have been synthesized under hydrothermal. Compound 1 displays one-dimensional (1-D) infinite chains, which are stabilized by hydrogen bonds and π···π stacking interactions into a three-dimensional (3-D) supramolecular architecture. Compound 2 is a (4·82)(4·85) 3-D network structure, and two pairs of single-left (L) and single-right-handed (R) helical chains can be found in the network. Thermogravimetric analyses of 1 and 2 are discussed in detail. In addition, the fluorescent property of 2 has been studied in the solid state at room temperature.

Funding

The work is supported by Technology Research Program for Department of Education of Jilin Province [grant number 2012291]; the National Natural Science Foundation [grant number 51108122]; Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [grant number QA201025]; the Fundamental Research Funds for the Central Universities [grant number HIT. NSRIF. 2010053]; Science and Technology Innovation Talents Special Foundation of Harbin [grant number 2010RFQXG035], [grant number 2007RFXXG018].

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