Design, synthesis and optical characterization Of single fluorophore targeting different sub-cellular regions

by Tarushyam Mukherjee, Virupakshi Soppina and Sriram Kanva

Synthesis and Self assemblies of cholesterol conjugated stilbenes

by Tarushyam Mukherjee, Anuji K. V.and Sriram Kanva

A turn-On Michler�s Ketone-Benzimidazole fluorescent probe for selective detection of serum albumins

by Palash Jana, Nishaben Patel, Virupakshi Soppina and Sriram Kanva

A Competitive Effect of Acceptor Substitutions On the Opto-Electronic Features of Triphenylamine Cored Di α-Cyanostilbene Derivatives

Three novel triphenylamine cored di-branched α-cyanostilbenes with different electron-acceptors [H (neutral), CF3, and NO2] were synthesized. All the compounds exhibited a distinct positive solvatochromism dependent on the polarity and nature of the acceptor unit. Emission in binary solvent mixture reveals that CF3substituted chromophores promote the AIE effect with moderate emission wavelength shift. In contrast, NO2substitution drives the emission to a longer wavelength due to pronounced ICT but with quenched emission. Introducing CF3and NO2into a single molecule has a competing effect,i.e., balancing the pull-pull interactions enabled the enhancement of ICT characteristics with a moderate ACQ to AIE effect. These studies reveal that electron-accepting functionalities create a considerable impact on an otherwise identical template\u27s optoelectronic characteristics. DFT and TDDFT analysis correlate the absorption and wavelength shift with acceptor functionality, and DOS-PDOS analysis helps predicting their photophysical characteristics upon photoexcitation. PES scan studies demonstrated that arms with strong acceptor units increased the energy barrier of dynamic intramolecular rotation of the α-cyano unit

Antimicrobial Personal Protection Clothing: Development of Visible Light Activated Antimicrobial Coatings for Nonwoven Polypropylene Fibers

Abstract During the COVID‐19 pandemic, the use of polypropylene fleece‐based personal protection equipment (PPE) increased significantly to over ten million tons. Typically, most PPEs are discarded after a single use, to prevent self‐infection of users and spread of infectious agents. However, in order to minimize plastic waste without compromising the protective properties of PPE, it is crucial to explore new reusable or longer‐lived materials. Here, a visible light‐activatable antimicrobial photodynamic dye coating for PPEs is presented. In this context, coating with thiomorpholino‐methylene blue (TMB), derived from methylene blue by introducing two thiomorpholine units, is found to show high antibacterial activity. TMB is integrated into rotary printing suspension, a commercial nitrocellulose‐based printing matrix. The concentration of TMB in adhesive is optimized, and found that 5% TMB is suitable for coating PPE, for reducing the number of Gram‐positive and ‐negative bacteria by 99.99% after 6 h of white light irradiation. Bacterial filtration efficiency and breathability tested according to EN 14683, confirmed that TMB coating does not affect the filter performance. Thus, this antimicrobial photodynamic dye coating technique offers a promising solution for a safer and extended use of PPE, and reduction of plastic waste generated by PPEs