A5034641813- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Luminescence and Fluorescent Materials
- Photoreceptor and optogenetics research
- Photochromic and Fluorescence Chemistry
- Photochemistry and Electron Transfer Studies
- Quantum Dots Synthesis And Properties
- Crystallography and molecular interactions
- Iron-based superconductors research
- Inorganic Chemistry and Materials
- Rare-earth and actinide compounds
- Supramolecular Self-Assembly in Materials
- Force Microscopy Techniques and Applications
- Molecular Sensors and Ion Detection
- Advanced biosensing and bioanalysis techniques
- Advanced Fluorescence Microscopy Techniques
- Porphyrin and Phthalocyanine Chemistry
- Innovative Microfluidic and Catalytic Techniques Innovation
- Nanoplatforms for cancer theranostics
- Carbon and Quantum Dots Applications
- Perovskite Materials and Applications
- Circadian rhythm and melatonin
- Spectroscopy and Quantum Chemical Studies
- Analytical Chemistry and Sensors
- ZnO doping and properties
Centre National de la Recherche Scientifique
2023-2025
École Normale Supérieure - PSL
2023-2025
Sorbonne Université
2023-2025
Université Paris Sciences et Lettres
2023-2025
Indian Institute of Science Education and Research Kolkata
2015-2024
Université Paris 1 Panthéon-Sorbonne
2024
Processus d'Activation Sélective par Transfert d'Énergie Uni-électronique ou Radiatif
2023
Madan Mohan Malaviya University of Technology
2016-2019
Indian Institute of Science Education and Research, Bhopal
2015
Indian Institute of Science Education and Research, Tirupati
2015
Abstract Single crystals of optoelectronic materials that respond to external stimuli, such as mechanical, light, or heat, are immensely attractive for next generation smart materials. Here we report single a green fluorescent protein (GFP) chromophore analogue with irreversible mechanical bending and associated unusual enhancement the fluorescence, which is attributed strained molecular packing in perturbed region. Soft crystalline fluorescence intensity modulations occurring response...
There is no literature report of simultaneously achieving near-unity PLQY (ensemble level) and highly suppressed blinking (ultrasensitive single-particle spectroscopy (SPS) in a toxic-metal-free QD. In this Letter we accomplishing (96%) (>80% ON fraction) CuInS2/ZnSeS Core/Alloy-Shell (CAS) addition, (i) gigantic enhancement (from 15% (Core) to 96% (CAS QD)), (ii) ultrahigh stability over 1 year without significant reduction at the ensemble level, (iii) high magnitude (nearly 3 times)...
Abstract Photons are widely used for producing and degrading matter, yet current approaches their delivery to unstirred light‐absorbing media give poor uniformity energetic efficiency. Here, a cheap modular Do‐It‐Yourself (DIY)‐realizable mini‐photoreactor is introduced that addresses these issues, additionally allows in situ absorption, fluorescence, Nuclear Magnetic Resonance (NMR) spectroscopy. Its first configuration features an internal light‐scattering cylindrical liquid‐filled...
We report the synthesis and dynamical behavior of a carbon dot (CD) with near 100% photoluminescence quantum yield in water for very large pH range (1-12). This CD exhibits rotational correlational time only ∼130 ps, signifying whole is not exhibiting photoluminescence. Unlike most carbon-based nanoparticles (which act as quencher fluorescence), this could donor, Förster model account experimental observables resonance energy transfer (RET) experiment quite well. Based on two measurements,...
Dual fluorescence of GFP chromophore analogues has been observed for the first time. OHIM (o-hydroxy imidazolidinone) shows only a charge transfer (CT) band, CHBDI (p-cyclicamino o-hydroxy benzimidazolidinone) comparable intensity CT and PT (proton transfer) MHBDI (p-methoxy higher band. It could be shown that differential optical behavior is not due to conformational variation in solid or solution phase. Rather, control excited state electronic energy level acidity constant by functional...
Abstract Single crystals of optoelectronic materials that respond to external stimuli, such as mechanical, light, or heat, are immensely attractive for next generation smart materials. Here we report single a green fluorescent protein (GFP) chromophore analogue with irreversible mechanical bending and associated unusual enhancement the fluorescence, which is attributed strained molecular packing in perturbed region. Soft crystalline fluorescence intensity modulations occurring response...
Abstract Despite the need for quantitative measurements of light intensity across many scientific disciplines, existing technologies measuring dose at sample a fluorescence microscope cannot simultaneously retrieve along with spatial distribution over wide range wavelengths and intensities. To address this limitation, we developed two rapid straightforward protocols that use organic dyes fluorescent proteins as actinometers. The first protocol relies on molecular systems whose decays and/or...
Charge transfer induced nonradiative internal conversion for <italic>meta</italic> GFP chromophore analogues is studied.
The competition between excited-state proton transfer (ESPT) and torsion plays a central role in the photophysics of fluorescent proteins green protein (GFP) family their chromophores. Here, it was investigated single GFP chromophore analogue bearing o-hydroxy p-diethylamino substituents, OHIM. light-induced dynamics OHIM studied by femtosecond transient absorption spectroscopy, at different pH. We found that is determined electron-donating character diethylamino group: torsional relaxation...
Contrary to the belief of chemistry community, intense charge transfer is observed between meta-oriented donor–acceptor moieties in ultrasmall single-benzenic fluorophores. Red emission any solvent has so far been reported with molecular fluorophores having lowest weight (MW) 252.5 Da; however, we have achieved same a meta-fluorophore an MW only 203.1 Da. nonpolar fluorophore minimum 464.5 Da, but 255.3 Intense Stokes (260 nm) and solvatochromic (160 shifts, high magnitudes fluorescence...
The smallest fluorophore reported in literature to emit the red has a MW > 250 Da. Hereby, we report unique way obtain red, orange emission ultrasmall fluorophores (DEAMB, = 207 Da), (DEAB, 177 respectively. In this exceptional concept, explore charge transfer between meta-oriented donor–acceptor moieties single-benzenic (meta-fluors). Unlike existing red-emitting small-fluorophores, our meta-fluors exhibit an intense Stokes shift (225 nm), solvatochromic (175 and excited-state lifetime (21...
Herein, the instantaneous synthesis of highly crystalline, uniform-sized (
The effect of structural rigidity towards enhancement fluorescence quantum yield GFP chromophore analogues has been documented. In the present study, a new way enhancing two ortho-meta meta-methoxy-ortho-hydroxy-benzylimidazolidinone (abbreviated as mOMe-HBDI) and meta-diethylamino-ortho-hydroxyl imidazolidinone MOHIM) reported. This is controlled by H-bond accepting ability (denoted β value) solvent happens only in case having ortho (hydroxyl)-meta (electron donating group) not para...
Absolute measurement of light intensity is sought for in multiple areas chemistry, biology, physics, and engineering. It can be achieved by using an actinometer from analyzing the time-course its reaction extent on applying constant light. However, most reported actinometers exploit absorbance observable reporting extent, which not very sensitive nor relevant imaging systems. In this work, we report a series hydrophobic hydrophilic caged fluorophores that overcome preceding limitations....
Abstract Efficient tools for controlling molecular functions with exquisite spatiotemporal resolution are much in demand to investigate biological processes living systems. Here we report an easily synthesized caged dexamethasone photo‐activating cytoplasmic proteins fused the glucocorticoid receptor. In dark, it is stable vitro as well vivo both zebrafish ( Danio rerio ) and Xenopus sp , two significant models of vertebrates. contrast, liberates upon UV illumination, which has been...
Red emission in crystals has been observed with an ultra-small-single-benzenic