Department of Biological Sciences

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    A New Aggregation Induced Emission Active Halochromic White Light Emissive Molecule: Combined Experimental and Theoretical Study
    (RSC, 2020) Chowdhury, Rajdeep; Laskar, Inamur Rahaman; Roy, Ram Kinkar
    Red/near infrared-emissive organic molecules that are aggregation induced emission (AIE) active and having a pH-sensitive core are high in-demand for real-world applications. We have designed and synthesized a far-red to near infrared (NIR) fluorogenic donor–acceptor (D–A) type probe 4-((4-(2-(3,3-dimethyl-3H-indole-2-yl)vinyl)phenyl)(phenyl)amino)benzaldehyde (TPA-SCY), that can undergo protonation with a stronger intramolecular charge transfer. The molecule is pH-sensitive and responds to the acidic behavior of chloroform to produce a unique halochromic white-light emission. Owing to its sensitivity toward pH and its highly emissive nature in the red/NIR region at low pH (approximately 3–5), it accumulates in the intracellular lysosomes and can be used as a live-tracker for lysosomes. Successful application of time-dependent density functional theory with the use of an optimally tuned range-separated hybrid functional reproduces the experimental absorption and emission spectra within the 1–5 nm range (which is not observed when conventional range-separated hybrid functionals are used). Thus, the present work embodies synthesis and photophysical studies (supported by an efficient and highly accurate theoretical tool) of a new AIE active halochromic white light emissive molecule with extensive charge transfer properties and having the ability to behave as a live LysoTracker.
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    Decolourization of Orange G Dye by Microalgae Acutodesmus obliquues Strain PSV2 Isolated from Textile Industrial Site
    (IJASB, 2013-12) Verma, Sanjay Kumar
    Release of different types of synthetic dyes into the aquatic environment by various industrial sources is a major area of concern worldwide due to their low biodegradable nature. Conventional methods of dye removal are effective but high operating cost and energy requirement, generation of toxic sludge and regeneration problem of adsorbent limits their use at large scale. Biosorption of dye molecules by microorganisms is an economic and eco friendly technology for the treatment of textile wastewater.