Green synthesis of silver nanoparticles (AgNPs) is gaining momentum in the field of nano-research. Scoparia dulcis leaves were used as a reducing agent for the synthesis of silver nanoparticles from an aqueous solution of silver nitrate (AgNO 3 ). Synthesized AgNPs were characterized by UV-Vis spectroscopy, XRD, SEM with EDAX and TEM. UV-VIS surface plasmon resonance spectroscopy was observed at 430 nm. XRD data depicts that the NPs are crystalline in nature. The EDAX data indicate that 63.76% presence of Ag metal. The TEM & SEM results indicate that size of the AgNPs ranges from 15-25 nm. The results also support that spherical shape of the nanoparticles. In addition, the NPs are in polydispersed condition. The antimicrobial activities indicate significant inhibition of the growth of three pathogenic bacteria such as Pseudomonas ariginosa, Bacillua subtillis and Staphylococcus aureous. Cytotoxicity of this nanoparticle showed that this Ag-NP also has more cytotoxic effect on a lung cancer cell line, A549 cells compared to ovarian cancer cell line, PA1 indicating a possible therapeutic use of this AgNP.

Excited state intramolecular proton transfer (ESIPT) enabled fluorescent sensor phenanthroline diimino phenol (PDP) for Hg 2+ has been designed and synthesized. PDP which acts as a dual sensor selectively detects only Hg 2+ in mixed aqueous medium and fluoride in acetonitrile medium over other competing metal ions and anions. Binding of PDP with Hg 2+ is supported by DFT. ESIPT phenomenon in PDP is

A new "naked-eye" and ratiometric fluorescent zinc sensor (TAQ) of carboxamidoquinoline with 2-chloro-N-(quinol-8-yl)-acetamide as a receptor was designed and synthesized. The sensor shows good water solubility and high selectivity for sensing; about a 15-fold increase in fluorescence quantum yield and a 100 nm red-shift of fluorescence emission upon binding Zn²⁺ in aqueous HEPES buffer solution are observed. The human lung cancer cell line (A549) activity is also demonstrated.

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