We report unusual photophysical properties observed on two newly designed 3-hydroxychromone derivatives exhibiting the excited-state intramolecular proton transfer (ESIPT) reaction. The efficiency of ESIPT reaction is greatly enhanced upon excitation with high energy quanta to S ( > 1) levels in low-polarity solvents. Based on detailed analyses of excitation and emission spectra as well as time-resolved emission kinetics we derive that conditions, in which this phenomenon contradicting Kasha's rule is observed, are quite different from that for observation of anti-Kasha emission.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5952995 | PMC |
| http://dx.doi.org/10.1039/c5sc01945a | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Modified Imidazole-Phenol-Based ESIPT Fluorophores as Self-Absorption Free Emitters for Efficient Electroluminescent Devices.
Chem Asian J
December 2024
Vidyasirimedhi Institute of Science and Technology, Frontier research center, THAILAND.
Excited-state intramolecular proton transfer (ESIPT) molecules are promising fluorophores for various applications. Particularly, their self-absorption-free fluorescence properties would make them a perfect choice as emissive materials for organic light-emitting diodes (OLEDs). Nevertheless, to become effective emitters some of their properties need to be altered by structural modifications.
View Article and Find Full Text PDFESIPT fluorescence turn-on sensors for detection of short chain inorganic polyphosphate in water.
Org Biomol Chem
December 2024
Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104 Freiburg im Breisgau, Germany.
We introduce two water-soluble excited state intramolecular proton transfer (ESIPT) based fluorescent turn-on probes responding to inorganic polyphosphates. These ESIPT probes enable specific detection of short-chain inorganic polyphosphates over a range of different condensed phosphates. The probes are weakly emissive in their off-state due to the blocking of ESIPT by Cu coordination.
View Article and Find Full Text PDFExploring Excited-State Intramolecular Proton-Coupled Electron Transfer in Dinuclear Ir(III)-Complex via Covalently Tagged Hydroquinone: Phototherapy Through Futile Redox Cycling.
Small
December 2024
Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal, 721302, India.
Anticipating intramolecular excited-state proton-coupled electron transfer (PCET) process within dinuclear Ir-photocatalytic system via the covalent linkage is seminal, yet challenging. Indeed, the development of various dinuclear complexes is also promising for studying integral photophysics and facilitating applications in catalysis or biology. Herein, this study reports dinuclear [Ir(bis{imidazo-phenanthrolin-2-yl}-hydroquinone)(ppy)] (1) complex by leveraging both ligand-centered redox property and intramolecular H-bonding for exploring dual excited-state proton-transfer assisted PCET process.
View Article and Find Full Text PDFA TDDFT exploration on the excited-state intramolecular proton transfer in 2-(2'-hydroxyphenyl)-benzimidazole derivatives.
Spectrochim Acta A Mol Biomol Spectrosc
December 2024
Zhejiang Sci-Tech University, Hangzhou 310018, China. Electronic address:
Excited-state intramolecular proton transfer (ESIPT) reactions are one of the fundamental energy transformation reactions in catalysis and biological process. The combining ESIPT with the twisted intramolecular charge transfer (TICT) brings the richness of optical, photoelectronic performances to certain functional compounds. Delineating the mechanism of ESIPT + TICT reactions and further understanding why a specific functional group dominates are fundamentally crucial for the design and application of the functionally photoelectric materials.
View Article and Find Full Text PDFConcurrent ultrafast twisting and proton transfer photoreactions in new pyrano[2,3-]pyrazole derivatives.
Phys Chem Chem Phys
December 2024
Laser Research Center, Vilnius University, Saulėtekio av. 10, LT-10223, Lithuania.
Pyrano[2,3-]pyrazole derivatives are a class of compounds exhibiting dual solvent-dependent fluorescence. This interesting and potentially useful optical property is attributed to the excited state intramolecular proton transfer (ESIPT). We have investigated excited state dynamics of these molecules in detail using femtosecond time-resolved fluorescence and transient absorption spectroscopy.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!