Ganapati Subray Shankarling

The synthesis of glycoluril and its derivatives is carried out using the greener acids. We have screened four different greener acids for this synthesis, namely, (1) ethan‐1,2‐diyl bis(hydrogen sulfate) (EDSA), (2) NMP‐HSO ₄ ionic liquids (NHIL), (3) choline chloride: p‐TSA( ChCl:p‐TSA) DES and (4) choline chloride: oxalic acid (ChCl:OA) DES. These acids are easy to make, safe to handle, environmentally benign and recyclable. Along with the glycoluril, different glycoluril derivatives are also prepared. We have also developed a novel glycoluril derivative in which we have introduced 4‐bromophenyl moieties at 2 ^nd and 6 ^th position of the glycoluril. Our developed method is a one‐step reaction with shorter reaction time and high product yield. All the acids are recyclable up to four cycles without considerable loss of the yield. A comparative study of the yield obtained with the four acids is also carried out.

Graphene oxide (GO), a carbocatalyst, is explored for its catalytic activity in halogenation reactions of active aromatics.

We have successfully developed a simple, energy-efficient, and environmentally benign synthesis method for iron phthalocyanine (FePc) and a MOF based on copper under ambient conditions in water. The synthesized Cu–FePc MOF has been thoroughly characterized using various techniques, including PXRD, FTIR, SEM, TGA and BET. The catalytic activity of the synthesized Cu–FePc MOF was tested in two reactions: (a) oxidative dye degradation of methylene blue using H₂O₂ and (b) oxidation of cyclohexane to cyclohexanone using TBHP under mild reaction conditions. The catalyst showed excellent performance, as 10 mg of Cu–FePc MOF was able to degrade 20 ml of 40 ppm dye solution in just 16 min. Additionally, it achieved 96% conversion of cyclohexane to cyclohexanone in 3 h. The effect of various parameters such as initial pH, temperature, catalyst loading, and the concentration of H₂O₂ and TBHP on the catalyst's performance was investigated to optimize the reaction conditions. The Cu–FePc MOF demonstrated excellent recyclability without much loss in its catalytic activity.

We prepared a commercially viable Deep Eutectic Solvent (DES) based on Choline Chloride‐Urea‐copper acetate for the first time. It mediates the homocoupling of terminal alkynes, using air as an oxidant. Water is the only by‐product of the entire process. The method avoids ligands, bases, oxidants, and costly palladium catalysts, which qualifies the process greener than ever. The DES can be reused at least three times without affecting the reaction yield significantly. The key features of the protocol that qualify the process as green include the ambient reaction temperatures, lesser use of conventional organic solvents in the reaction, higher yields, and easy product isolation qualify the protocol as a green process.

This article presents two highly fluorescent donor-π-acceptor (D-π-A) moieties containing an electron-donating carbazole and phenothiazine donors fused with electron-withdrawing pyrrolo-quinoline acceptor dyes, PQC and PQPT. We also discussed the polymerization and film-forming process of dye PQC and PQPT doped in poly (methyl methacrylate) (PMMA) and polystyrene (PS) polymer to find their optical applications in polymer-based technology. We investigated the fluorescent properties of dyes PQC and PQPT from 0.01 to 1 wt% in poly(methyl methacrylate) (PMMA). We also investigated the changes in the spectrum shape and shift in wavelength with changes in poly(methyl methacrylate) (PMMA), polystyrene (PS), and TiO₂ doped in polystyrene (PS/TiO₂). The analysis of surface morphology of prepared polymer samples was done with the help of a scanning electron microscope. The thermal and photostability of synthesized dyes in poly (methyl methacrylate) (PMMA), polystyrene (PS), and TiO₂ doped in polystyrene (PS/TiO₂) were investigated to get detailed information owing to the application of fluorescent polymers in the field of optoelectronic, nanohybrid coatings in solar concentrators, etc. Graphical Abstract

This article presents two highly fluorescent donor- π -acceptor (D-π-A) moiety containing an electron-donating carbazole and phenothiazine donors fused with electron-withdrawing pyrrolo-quinoline acceptor dyes, PQC and PQPT. We also discussed the polymerization and film-forming process of dye PQC and PQPT doped in poly (methyl methacrylate) (PMMA) and polystyrene (PS) polymer to find their optical applications in polymer-based technology. We investigated the fluorescent properties of dyes PQC and PQPT from 0.01 – 1 wt. % in poly(methyl methacrylate) (PMMA). We also investigated the changes in the spectrum shape and shift in wavelength with changes in poly(methyl methacrylate) (PMMA), polystyrene (PS), and TiO₂ doped in polystyrene (PS/TiO₂). The analysis of surface morphology of prepared polymer samples was done with the help of a scanning electron microscope. The thermal and photostability of synthesized dyes in poly (methyl methacrylate) (PMMA), polystyrene (PS), and TiO₂ doped in polystyrene (PS/TiO₂) were investigated to get detailed information owing to the application of fluorescent polymers in the field of optoelectronic, nanohybrid coatings in solar concentrators, etc.