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Eswaran Kamaraj,박상혁 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
We report a series of imidazole based fluorescent dyes and their photophysical properties in particularly ESIPT. The impact of structural variation on photophysical properties and their association with solvent’s polarity and proticity were throughly investigated by comparing with their analogues of blocked ESIPT functionality. We have investigated their photophysical properties, using experimental transient absorption and theoretical DFT/TDDFT. Besides, the urease inhibitory activity of these compounds against Jack bean urease was also studied. All but one of the obtained compounds displayed inhibitory potential, as demonstrated by highest inhibition activity (0.0288±0.0034). Docking stimulation was performed to into the crystal structure of Jack bean urease and caprin protein at the active site to the probable binding mode. Furthermore, anti-cancer activity of imidazole derivatives were peformed by MTT analysis towards stomach cancer cell lines (AGS).
Velu Kuppu Sakthi,Kamaraj Eswaran,Sadagopan Jayakumar,Sonaimuthu Mohandoss,Ahmad Naushad,Alagarasan Jagadeesh Kumar,Ravisankar Parkavi,Lee Yong Rok 한국물리학회 2024 Current Applied Physics Vol.58 No.-
In this work, we have developed optically transparent zinc oxide nanoparticles doped with highly efficient of poly (aniline)-titanium dioxide (PANI/TiO2/ZnO) ternary composites were prepared by simple chemical oxidative polymerization method and its used as photo-anode for dye-sensitized solar cell (DSSC) applications. The as prepared PANI/TiO2/ZnO characterized by the various techniques such as FT-IR, XRD, HR-TEM, SAED, FE-SEM, AFM, and UV–Visible analysis. Morphological analysis was observed in the surface morphology of ZnO doped PANI/TiO2 in crystalline nature. The topographical AFM images were also observed in crystalline nature. Tauc plot analysis were examined the optical band-gap energy (2.95 eV) of PANI/TiO2/ZnO. The DSSCs assembled and as prepared PANI/TiO2, PANI/ZnO, TiO2/ZnO, PANI/TiO2/ZnO were used as photo-anode, 1- hexyl-3-methylimidazolium iodide containing the iodide/triiodide redox mediator used as the electrolyte, platinum paste used as a counter electrode. Among the devices, PANI/TiO2/ZnO photo-anode gives 8.31% efficiency.
Mahajan, Prasad G.,Dige, Nilam C.,Vanjare, Balasaheb D.,Kamaraj, Eswaran,Seo, Sung-Yum,Lee, Ki Hwan Elsevier Sequoia 2019 Journal of photochemistry and photobiology Chemist Vol. No.
<P><B>Abstract</B></P> <P>A Schiff base centered chemosensor namely (2<I>E</I>,<I>NE</I>)-<I>N</I>-(2,4-dihydroxybenzylidene)-2-(quinolin-2-ylmethylene)hydrazinecarbothioamide <I>i.e.</I> <B>SB</B> has been synthesized and further utilized for the selective and sensitive detection of four metal ions through dual channels based on absorption and fluorescence properties. The distinctive recognition of Ni<SUP>2+</SUP>, Cu<SUP>2+</SUP>, Co<SUP>2+</SUP>, and Cd<SUP>2+</SUP> in an aqueous solution was achieved by observation with the naked eye rapid color change, analyzing the absorption and fluorescence spectrum of chemosensor <B>SB</B> in the absence and presence of specific metal ion at respective concentration. The synthesized chemosensor <B>SB</B> offered extremely lower detection limit of nano molar level employing either the absorption or fluorescence method. The strong binding constant values such as 9.02 × 10<SUP>5</SUP> M<SUP>−1</SUP> for Ni<SUP>2+</SUP>, 11.21 × 10<SUP>5</SUP> M<SUP>−1</SUP> for Cu<SUP>2+</SUP>, 7.52 × 10<SUP>5</SUP> M<SUP>−1</SUP> for Co<SUP>2+</SUP> and 6.73 × 10<SUP>5</SUP> M<SUP>−1</SUP> for Cd<SUP>2+</SUP> indicate strong complexation between chemosensor <B>SB</B> and respective metal ion. The mechanism for change in the absorption and fluorescence properties of <B>SB</B> involves the interaction of respective metal ion with sulfur and oxygen functionality in <B>SB</B> molecule followed by the formation of ground state non-fluorescent complex <I>via</I> static quenching process. The TD-DFT studies for the theoretical calculations are in support of experimental interpretations. Pleasingly, the present approach allows quantitative determination of said metal ions in water samples at nano molar level.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Schiff base as dual mode chemosensor for detection of Ni<SUP>2+</SUP>, Cu<SUP>2+</SUP>, Co<SUP>2+</SUP> and Cd<SUP>2+</SUP>. </LI> <LI> Rapid naked eye color change and sensitive fluorescence sensing. </LI> <LI> Detection limit at nano molar levels <I>via</I> absorption or fluorescence method. </LI> <LI> TD-DFT based theoretical calculations are in support of experimental findings. </LI> <LI> Effective real water sample analysis for quantitative determination of said metal ions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>