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Fluorite and Mixed-Metal Kagome-Related Topologies in Metal-Organic Framework Compounds: Synthesis, Structure, and Properties

Mahata, Partha and Raghunathan, Rajamani and Banerjee, Debamalya and Sen, Diptiman and Ramasesha, S and Bhat, SV and Natarajan, Srinivasan (2009) Fluorite and Mixed-Metal Kagome-Related Topologies in Metal-Organic Framework Compounds: Synthesis, Structure, and Properties. In: Chemistry-an asian journal, 4 (6). pp. 936-947.

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Official URL: http://www3.interscience.wiley.com/journal/1223829...

Abstract

Two new three-dimensional metal-organic frameworks (MOFs) [Mn-2(mu(3)-OH)(H2O)(2)(BTC)]-2 H2O, I, and [NaMn(BTC)], II (BTC=1,2,4-benzenetricarboxylate = trimellitate) were synthesized and their structures determined by single-crystal X-ray diffraction (XRD). In I, the Mn-4 cluster, [Mn-4(mu(5)-OH)(2)(H2O)(4)O-12], is connected with eight trimellitate anions and each trimellitate anion connects to four different Mn-4 clusters, resulting in a fluorite-like structure. In II, the Mn2O8 dimer is connected with two Na+ ions through carboxylate oxygen to form mixed-metal distorted Kagome-related two-dimensional -M-O-M- layers, which are pillared by the trimellitate anions forming the three-dimensional structure. The extra-framework water molecules in I are reversibly adsorbed and are also corroborated by powder XRD studies. The formation of octameric water clusters involving free and coordinated water molecules appears to be new. Interesting magnetic behavior has been observed for both compounds. Electron spin resonance (ESR) studies indicate a broadening of the signal below the ordering temperature and appear to support the findings of the magnetic studies.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to John Wiley and Sons.
Keywords: carboxylate ligands; fluorite; Kagome; magnetic properties; manganese.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 21 Jul 2009 14:42
Last Modified: 21 Jul 2009 14:42
URI: http://eprints.iisc.ernet.in/id/eprint/21136

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