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Aggregation-Induced Emission of Platinum(II) Metallacycles and Their Ability to Detect Nitroaromatics

Chowdhury, Aniket and Howlader, Prodip and Mukherjee, Partha Sarathi (2016) Aggregation-Induced Emission of Platinum(II) Metallacycles and Their Ability to Detect Nitroaromatics. In: CHEMISTRY-A EUROPEAN JOURNAL, 22 (22). pp. 7468-7478.

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Official URL: http://dx.doi.org/10.1002/chem.201600698

Abstract

Two new acceptors containing platinum-carbazole (1) and platinum-triphenylamine (2) backbones with bite angles of 908 and 1208, respectively, have been synthesised and characterised. Reactions of the rigid acceptor 1 with linear dipyridyl-based donors (3 and 4) generated 4+4] self-assembled molecular squares (5 and 6), and similar treatments with acceptor 2 instead of 1 yielded 6+6] self-assembled molecular hexagons (7 and 8). The metallacycles were characterised by multinuclear NMR spectroscopy (H-1 and P-31) and ESI-MS. The geometries of the metallacycles were optimised by using the PM6 method. When aggregates of the metallacycles were formed by adding hexane solutions in dichloromethane, aggregation-induced emission was observed for metallacycles 5 and 7, and aggregation-caused quenching was observed for metallacycles 6 and 8. The formation of aggregates was verified by dynamic light scattering and TEM analyses. Macrocycles 5 and 7 are white-light emitters in THF. Moreover, their high luminescence in both solution and the solid state was utilised for the recognition of nitroaromatic explosives.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the WILEY-V C H VERLAG GMBH, POSTFACH 101161, 69451 WEINHEIM, GERMANY
Keywords: fluorescence; luminescence; macrocycles; platinum; sensors
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Id for Latest eprints
Date Deposited: 22 Aug 2016 09:47
Last Modified: 22 Aug 2016 09:47
URI: http://eprints.iisc.ac.in/id/eprint/54498

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