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Guest driven structural transformation studies of a luminescent metal–organic framework

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Abstract

A two-dimensional (2D) porous metal-organic framework (MOF) [{Zn2(L) 4(OTf) 4}.2(DCM).xG]n (1 G) (OTf = trifluoro methane sulfonate, DCM = Dichloromethane, L (1, 4-bis (4-pyridyl)-2, 3-diaza-1, 3-butadiene) synthesized at room temperature. Free guests DCM were encapsulated in the pores of the MOF. On air drying the MOF loses free DCM molecules and changed its structure in a crystal to crystal manner to produce compound 1 [{Zn(L)2(OTf)2}.XG]n(1). This guest-induced breathing of the framework was also supported from PXRD patterns. Solid state photoluminescence properties of the dynamic MOF were studied at room temperature.

A 2D porous luminescent framework has been synthesized based on a long flexible N-donor ligand. The compound showed guest driven breathing of the framework. The guest dependent dynamic structural behaviour has been shown by SCSC experiments and PXRD patterns of the compound. Solid state UV and photoluminescence spectra were recorded for the compound at room temperature. Such structurally dynamic behaviour in conjunction with luminescence property of a metal organic framework might be very useful as a guest-responsive material for efficient separation purpose.

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Acknowledgements

BM is thankful to the Council of Scientific & Industrial Research (CSIR) for research fellowship. We are grateful to IISER Pune for research facilities and the Department of Science and Technology (DST) (Project no. GAP/ DST/CHE-12-0083) and The Department of Atomic Energy (DAE) (Project no. 2011/20/37C/06/BRNS) for financial support.

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Correspondence to SUJIT K GHOSH.

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Crystallographic data for the structural analysis have been deposited with the Cambridge Crystallographic data Centre. CCDC 996229 (1 G) and CCDC 996228 (1). Copies of the data can be obtained free of charge at www.ccdc.cam.ac.uk/conts/retrieving.html [or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB21EZ, UK, Fax: (internet) + 44-1223-336-033; E-mail: deposit@ccdc.cam.ac.uk.

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MANNA, B., SINGH, S. & GHOSH, S.K. Guest driven structural transformation studies of a luminescent metal–organic framework. J Chem Sci 126, 1417–1422 (2014). https://doi.org/10.1007/s12039-014-0704-y

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  • DOI: https://doi.org/10.1007/s12039-014-0704-y

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