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Issue 92, 2015
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Rational design of a pyrene based luminescent porous supramolecular framework: excimer emission and energy transfer

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Abstract

Here we report a rational design and synthesis approach to construct a porous luminescent supramolecular framework by modulating the spatial arrangement of aromatic linkers directed by coordination to a metal ion. A metal–organic complex, {Cd(oxo-pba)2(H2O)2}n (1) has been synthesized using a functionalized pyrene linker, 1-pyrene-γ-oxo-butyric acid (oxo-pba) and this structure is extended to a 2D supramolecular framework through non-covalent interactions. Using Zn(II) as a metal center we have also synthesized {[Zn(oxo-pba)2(bpy)]·4H2O}n (2), which has a similar chemical structure as compound 1, except 2,2′-bipyridine chelator occupies the positions of the coordinated water molecules. Further, compound 2 extends via several π–π and C–H⋯π interactions to form a 3D porous supramolecular structure as supported by CO2 (195 K) and different solvent vapour adsorption studies. Compounds 1 and 2 both show bright pyrene excimer emission. Furthermore, the porosity and aromatic π electron decorated pore surface of compound 2 has been exploited for noncovalent encapsulation of a suitable acceptor dye acridine orange (AO) and an efficient energy transfer from the framework to encapsulated dye was observed.

Graphical abstract: Rational design of a pyrene based luminescent porous supramolecular framework: excimer emission and energy transfer

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Supplementary files

Article information


Submitted
20 Jul 2015
Accepted
24 Aug 2015
First published
24 Aug 2015

RSC Adv., 2015,5, 74986-74993
Article type
Paper
Author version available

Rational design of a pyrene based luminescent porous supramolecular framework: excimer emission and energy transfer

K. Prasad, R. Haldar and T. K. Maji, RSC Adv., 2015, 5, 74986
DOI: 10.1039/C5RA14267A

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