Diffusion‐limited kinetics is a key mechanistic debate when consecutive photoelectron transfer (conPET) discussed in photoredox catalysis. In‐situ generated organic photoactive radicals can access catalytic systems as reducing alkaline metals that activate remarkably stable bonds. However, many cases, the extremely short‐lived transient nature of these doublet state open‐shell species has led to debatable studies, hindering adoption and development. Herein, we document use an isolated...

Abstract In this work, we report, the synthesis of Boron and Sulfur co-doped graphene quantum dots (BS-GQDs) its applicability as a label-free fluorescence sensing probe for highly sensitive selective detection dopamine (DA). Upon addition DA, intensity BS-GQDs were effectively quenched over wide concentration range DA (0–340 μM) with an ultra-low limit 3.6 μM. The quenching mechanism involved photoinduced electron transfer process from to dopamine-quinone, produced by oxidization under...

We report here that optically resonant donor copolymers are used to amplify the sensitivity of an electron-rich fluorescent copolymer toward electron-deficient nitroaromatic compounds (NACs). In a polymer–polymer system, we found ultrafast Förster resonance energy transfer (FRET) enhances primeval polymer sensor by 6-fold approximately conventional NACs like 2,4-dinitrotoluene (DNT), 2,4,6-trinitrotoluene (TNT), and 2,4,6-trinitrophenol (TNP). The present article reports optical for...

Diffusion‐limited kinetics is a key mechanistic debate when consecutive photoelectron transfer (conPET) discussed in photoredox catalysis. In‐situ generated organic photoactive radicals can access catalytic systems as reducing alkaline metals that activate remarkably stable bonds. However, many cases, the extremely short‐lived transient nature of these doublet state open‐shell species has led to debatable studies, hindering adoption and development. Herein, we document use an isolated...

Purpose This paper aims to assist managers and food supply chain practitioners in efficiently implementing lean green (LG) practices for sustainability. Examining barriers LG practices, as well prioritizing mitigation strategies the chain, are all part of this work. Design/methodology/approach Using a combination literature review expert team inputs, investigated their solutions under PESTEL (Political, Economic, Social, Technological, Environmental Legal) framework. To prioritize them, work...

Composite Electrolytes (1-x)CsH2PO4/xTiO2(0≤x≤0.4) were prepared and analyzed the structural, thermal, transport properties. We have investigated ionic conductivity of composite electrolytes highly pressurized pellets found that pure CsH2PO4 (CDP) increased three orders magnitude at transition temperature. The value composites is greater than CDP after 250°C. Arrhenius plots confirmed conductive nature conduction. dehydration behavior thermal stability materials observed in terms...

Abstract Electrospinning is an efficient technique to fabricate nanofibers of controlled diameter and uniform morphology. Herein, we report a low‐cost high‐yield route PAN/DAC composite its use for vapor sensing 2,4‐Dinitrotoluene (DNT) 2,4,6‐Trinitrotoluene (TNT) with detection level in the range parts‐per‐billion. Furthermore, ability photo‐induced electron transfer mechanism DAC towards DNT TNT solution phase were also investigated detail via absorption, steady‐state, time‐resolved...

In recent years, in-situ generated organic radicals have been used as highly potent photoinduced electron transfer (PET) agents resulting in catalytic systems reducing alkaline metals that can activate remarkably stable bonds. However, the transient nature of these doublet state open-shell species has led to debatable mechanistic studies, hindering adoption and development. Herein, we document use an isolated neutral radical a photoreducing with reduction potential lower than – 3.5 V vs SCE....

Hydroxylation reactions are important in biological processes and synthetic schemes. Many challenging hydroxylation have been achieved using photoredox catalytic methods. For the oxidative of arylboronic acids, methylene blue has used successfully as a catalyst to produce phenyl groups. Here we use broadband transient absorption spectroscopy determine mechanism reaction with phenylboronic acid presence N,N-diisopropylethylamine. Our results show that proceeds through triplet state oxygen,...

Over the past few years, photoredox catalysis has led to significant transformations in modern synthetic chemistry. It allowed development of new pathways for assembly complex molecular scaffolds using light as a driving force. However, investigations ultrafast light-initiated mechanisms required these reactions are relatively scarce. Here we follow dynamics red-light organic photocatalyst, N,N′-di-n-propyl-1,13-dimethoxyquinacridinium (nPr-DMQA+), aerobic oxidative hydroxylation...

Methylene blue is used as a red-light photoredox catalyst for oxidative hydroxylation reactions. At typical loadings methylene forms dimers that do not participate in the reaction limiting availability of catalyst.

Radicals and other open-shell molecules play a central role in chemical transformations redox chemistry. While radicals are often highly reactive, stable radical systems desirable for range of potential applications, ranging from materials chemistry catalysis to spintronics quantum information. Here we investigate the ultrafast properties system with temperature-dependent spin-tunable properties. This complex, Cu(II) hexaethyl tripyrrin-1,14-dione, accommodates unpaired electrons localized...

The efforts have been made in the field of Sign Language Recognition research from last few decades. language is basically an instrument for idea/information propagation through gestures, using hand, lip, and facial expressions. These features are form sign's every sign pattern has a very different meaning. Typical used gestures hand gestures. corresponding signs modelled automatic detection & recognition signs. This helps translation. In this paper, brief introduction its modelling approach...