Coordination-Driven Fluorescent J-Aggregates in a Perylenetetracarboxylate-Based MOF: Permanent Porosity and Proton Conductivity

Sikdar, Nivedita and Dutta, Dipak and Haldar, Ritesh and Ray, Turjya and Hazra, Arpan and Bhattacharyya, Aninda Jiban and Maji, Tapas Kumar (2016) Coordination-Driven Fluorescent J-Aggregates in a Perylenetetracarboxylate-Based MOF: Permanent Porosity and Proton Conductivity. In: JOURNAL OF PHYSICAL CHEMISTRY C, 120 (25). pp. 13622-13629.

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Abstract

Here we report the synthesis and structural characterizations of a new 3D functional metal-organic framework {K-8(PTC)(2)(H2O)(1.5)]center dot 4H(2)O}(n) formed by the self-assembly of K-I and chromophoric linker perylenetetra-carboxylate (PTC). The structure determination shows a 3D pillared-layer framework, where perylene cores are arranged in an unusual end-to-end off-slipped and zigzag arrangement directed by K-I-carboxylate bonding. Photophysical studies revealed a broad absorption band with lambda(max) of 531 nm and bathochromically shifted red emission centered at 655 nm. This characteristic emission has been assigned due to J-coupling of the PTC linkers in the solid state. The framework contains 1D water-filled channel, and the desolvated framework shows permanent porosity, ``as realized by type-I CO2 adsorption profile at 195 K. Interestingly, the guest and coordinated water molecules in the framework are connected via H-bonding and based on these characteristics, the framework was further exploited for proton conduction. It shows remarkable conductivity of 1 x 10(-3) S cm(-1) under ambient conditions (98% RH) with low activation energy.

Item Type:	Journal Article
Publication:	JOURNAL OF PHYSICAL CHEMISTRY C
Publisher:	AMER CHEMICAL SOC
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	19 Aug 2016 06:55
Last Modified:	19 Aug 2016 06:55
URI:	http://eprints.iisc.ac.in/id/eprint/54409

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