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Title: Synthesis characterization and evaluation of some chemical reaction based optical chemosensors for a few anions
Researcher: Asthana Sharad Kumar
Guide(s): Upadhyay K. K.
Keywords: A conjugate of hemi cyanine and quinoline as a dual channel chromofluorogenic sensor for F-/ HS
A fluorescein derivative bearing three electrophilic centers identifies H2S selectively in semi-aqueous medium
An efficient naked eye recognition of fluoride in acetonitrile through a chromofluorogenic turn-ON probe designed over the skeleton of fluorescein
Physical Sciences
University: Banaras Hindu University
Completed Date: 2017
Abstract: The reaction based chromofluorogenic chemosensors are an eye catching and burning area of contemporary research particularly in the field of chemical sciences for last few decades [1]. The very nature of work in this field is multidisciplinary and shares borders with a number of other scientific disciplines particularly with physics, electronics and biology [2]. The roles of fluorescent chemosensors in accurate marking of analytes in various types of samples including living cells also have been a matter of extensive and intensive research in last few years [3]. These chemodosimeters incorporate the protecting / masking unit and signalling units (fluorophores). We have exploited traditional dyes viz; fluorescein and quinoline for the design and synthesis purposes as these absorb particular wavelengths of visible/ UV light, leaving the remaining wavelengths to be reflected and seen as color by the observer. At the same time due to high extent of conjugation they are supposed to be fluorescent also. Organic dyes (and#960;-conjugated system) are quite known for their interaction with ultraviolet (UV), visible (Vis), and near infrared (IR) regions and hence are of wide interest in the field of chemosensing [4]. Tetramethyl rhodamine (TMR), carboxytetramethyl rhodamine (TAMRA), and carboxy-X-rhodamine (ROX) are all rhodamine based dyes and are good examples of light interacting systems. The UV dyes are typically polycyclic aromatic hydrocarbons viz; quinoline, pyrene, naphthalene, anthracene and coumarins, while the vis./near IR dyes include xanthene derivatives, fluorescein, rhodamine and cyanine based derivatives. The chemodosimeters incorporating any nucleus from the above list produce specific chromofluorogenic signal upon their specific interaction with a specific analyte with lowest detection limits of the order of nano to picomolar to even femto-molar also [5]. Despite numerous studies mentioned in the literature, new strategies and sensing mechanisms pertaining to chemodosimeters design are still not very rich [1a, and b, 3a]. newline
Appears in Departments:Department of Chemistry

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