Structural Variations in Coordination Polymers of Sodium and Cesium Dicarboxylates |
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| Authors: | Bhaskar Nath Jubaraj B Baruah |
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| Affiliation: | 1. Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
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| Abstract: | The coordination polymer {Na2L(μ-H2O)(H2O)3]·H2O} n (1) derived from 2,2′-(phenylmethylidene-bis(3,5-methyl-2-phenyleneoxy)] diacetic acid (H2 L) has repeat units comprising of hexa-coordinate diaqua-bridged dinuclear sodium complex ions. These units are connected through intervening mononuclear complex parts having penta-coordinated sodium ions. The sodium ions adopt repeated hexameric chair-like arrangement in the polymer. The cesium salt of H2 L namely Cs(HL)(μ-H2O)(H2O)] n (2) is a coordination polymer. In this case one acid group of the ligand is deprotonated and 2 form self-assembly by intermolecular hydrogen bonds between the free carboxylic acid groups. The fluoro-substituted ligand 2,2′-(2-fluorophenylmethyledene-bis(3,5-methyl-2-phenyleneoxy)] diacetic acid (H 2 L f ) forms disodium salt with a composition {Na2Lf(μ-H2O)(H2O)3}·H2O] n (3); which is a two dimensional coordination polymer. On the other hand the corresponding cesium salt of H 2 L f has a composition {(H2O)Cs(μ-H2O)(μ-Lf)Cs(H2O)2}] (4); which is also a 2-D coordination polymer. The cesium ions are six or nine coordinate in the polymer and the coordination polymer possesses unusual Cs···F–C coordination bond. |
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