Synthesis and Characterization of Two- and Three-Dimensional Calcium Coordination Polymers Built with Benzene-1,3,5-tricarboxylate and/or Pyrazine-2-carboxylate

Abstract

Two new calcium coordination polymers, [Ca 3 (btc) 2 (H 2 O) 12 ](1) and [Ca 2 (btc)(pzc)(H 2 O) 3 ] (2) (btc = benzene-1,3,5-tricarboxylate, pzc = pyrazine-2-carboxylate), have been synthesized using the hydro/ solvothermal method and have been characterized using X-ray diffraction, IR, UV−vis, thermogravimetric analysis, and fluorescence analysis. The structure of compound 1 is a three-dimensional framework consisting of helical chains of calcium coordination polymers, while that of compound 2 is a double layered network in which the inorganic zigzag chains of calcium coordination polyhedra are linked by organic ligands. Both compounds show blue fluorescence when excited with UV light. Density functional theory calculations on electronic absorption spectra of organic ligands and calcium coordination polymers are discussed.

Design and synthesis of coordination polymers with chelated units and their application in nanomaterials science

“…180 There is interest in CP with [Ca 2 L(L 0 )] n unit based on pyrazine-2-carboxylate (L) and benzene-1,3,5-tricarboxylate (L 0 ) synthesized by hydro(solvo)thermal method forming a double layered network, in which inorganic zigzag chains of coordination Ca polyhedron are bound with organic ligands. 181 182 Different synthetic strategies are used in hydro(solvo) thermal synthesis of CPs based on the different imidazoledicarboxylic acids: imidazole-4,5-dicarboxylic, 183 2-p-methoxyphenyl-1H-imidazole-4,5-dicarboxylic, 184 1-(4-carboxybenzyl)-1H-imidazole-4,5-dicarboxylic, 185 and 2-(pyridine-3-yl)-1H-imidazole-4,5-dicarboxylic 186 acids.…”

Conformational Preferences of N,N-Dimethylsuccinamate as a Function of Alkali and Alkaline Earth Metal Salts: Experimental Studies in DMSO and Water As Determined by 1H NMR Spectroscopy

“…As for the divalent metal salts, the calculated Ca 2+ –O distances (2.41–2.45 Å) in 1d are within range of values found in crystal structures (2.26–2.59 Å). 23 The calculated Mg 2+ –O distances (2.10–2.18 Å) however, are slightly greater than the values found in crystal structures (1.99–2.09 Å), 24 , 25 which could be a result of differential packing forces in the solid state.…”

Crystal structure of 3,5-dicarboxybenzoate — benzene-1,3,5-tricarboxylic acid (1/1), C24H22N2O12

“…The 1,3,5-benzenetricarboxylic acid (H 3 BTC) and its deprotonated analoga are excellent multidentate aromatic ligands [1,2].…”