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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/1287

Title: Extended metal-organic solids based on benzenepolycarboxylic and aminobenzoic acids
Authors: MURUGAVEL, R
ANANTHARAMAN, G
KRISHNAMURTHY, D
SATHIYENDIRAN, M
WALAWALKAR, MG
Keywords: porous solids
chemistry
binding
alkali
Issue Date: 2000
Publisher: INDIAN ACADEMY SCIENCES
Citation: PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES-CHEMICAL SCIENCES,112(3)273-290
Abstract: This article describes the recent results obtained in our laboratory on the interaction of polyfunctional ligands with divalent alkaline earth metal ions and a few divalent transition metal ions. Treatment of MCl2. nH(2)O (M = Mg, Ca, Sr or Ba) with 2-amino benzoic acid leads to the formation of complexes [Mg(2-aba)(2)] (1), [Ca(2-aba)(2)(OH2)(3)](infinity) (2), [{Sr(2-aba)(2)(OH2)(2)}(2). H2O)](infinity) (3), [Ba(2-aba)(2)(OH2)](infinity) (4), respectively. While the calcium ions in 2 are hepta-coordinated, the strontium and barium ions in 3 and 4 reveal a coordination number of nine apart from additional metal-metal interactions. Apart from the carboxylate functionality, the amino group also binds to the metal centres in the case of strontium and barium complexes 3 and 4. Complexes [{Mg(H2O)(6)} (4-aba)(2). 2H(2)O] (5), [Ca(4-aba)(2)(H2O)(2)] (6) prepared from 4-aminobenzoic acid reveal more open or layered structures. Interaction of 2-mercaptobenzoic acid with MCl2. 6H(2)O (M = Mg, Ca), however, leads to the oxidation of the thiol group resulting in the disulphide 2,2'-dithiobis(benzoic acid). New metal-organic framework based hydrogen-bonded porous solids [{M(btec) (OH2)(4)}(n). n(C4H12N2). 4nH(2)O] (btec = 1,2,4,5-benzene tetracarboxylate) (M = Co 9; Ni 10; Zn 11) have been synthesized from 1,2,4,5-benzene tetracarboxylic acid in the presence of piperazine. These compounds are made up of extensively hydrogen-bonded alternating layers of anionic M-btec co-ordination polymer and piperazinium cations. Compounds 2-11 described herein form polymeric networks in the solid-state with the aid of different coordinating capabilities df the carboxylate anions hydrogen bonding interactions.
URI: http://dspace.library.iitb.ac.in/xmlui/handle/10054/14473
http://hdl.handle.net/100/1287
ISSN: 0253-4134
Appears in Collections:Proceedings papers

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