Extended metal-organic solids based on benzenepolycarboxylic and aminobenzoic acids |
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| Authors: | R Murugavel G Anantharaman D Krishnamurthy M Sathiyendiran and M G Walawalkar |
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| Institution: | (1) Department of Chemistry, Indian Institute of Technology, 400 076 Powai, Mumbai, India |
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| 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 MC12·nH2O (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]∞ (2), Sr(2-aba)2(OH2)2
2·H2O)]∞ (3), Ba(2-aba)2(OH2)]∞ (4), respectively. While the calcium ions in2 are hepta-coordinated, the strontium and barium ions in3 and4 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 complexes3 and4. Complexes Mg(H2O)6(4-aba)2·2H2O] (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 MCl2·6H2O (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)·4nH2O] (btec = 1,2,4,5-benzene tetracarboxylate) (M = Co9; Ni10; Zn11) 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. Compounds2- 11 described herein form polymeric networks in the solid-state with the aid of different coordinating capabilities of the carboxylate
anions hydrogen bonding interactions. |
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| Keywords: | Coordination polymer aminobenzoic acid benzene tetracarboxylic acid alkaline earth metals supramolecular chemistry |
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