Photophysical and Photochemical Studies in Biopolymer-based Co-assemblies and Host-Guest Complexes of Organic Chromophores

Kumar, Sanat (2022) Photophysical and Photochemical Studies in Biopolymer-based Co-assemblies and Host-Guest Complexes of Organic Chromophores. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS dissertation of Sanat Kumar (17MS223)) 17MS223_Thesis_file.pdf - Submitted Version Restricted to Repository staff only Download (3MB)

Abstract

Based on the amphiphilic design, two different species of molecules having two different chromophoric units, pyrene and cyanostilbene, were synthesised and studied. The two species of molecules were employed to achieve various objectives, which can be utilised in an array of applications. The pyrene-based molecules showed impressive results when utilised to detect bio-polymers like heparin and DNA. The molecules showed enhancement in the photoluminescence with both heparin and DNA, which is unique in itself as DNA is known for its tendency to quench fluorescence. The molecule–polyanion co-assembly was further utilised to achieve photomodulation using energy transfer and light harvest using different acceptor dyes. The cyanostilbene based molecule was previously studied and utilised for heparin detection and photomodulation using host-guest chemistry with cucurbit[7]uril. The molecules were known to undergo aggregation to form excimer-like species, and they also underwent photoreaction upon photoirradiation with 365 nm UV light to form cyclised phenanthrene derivatives. Host-guest chemistry with cucurb[8]ituril was utilised to achieve control over the photoreaction. In addition to that, the host-guest complex was further utilised for photomodulation due to energy transfer with different acceptor dyes.

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