Results 61 to 70 of about 2,183 (174)

Sulfur‐ and Selenium‐Decorated Coumarins: Synthetic Strategies Involving Cyclization and Late‐Stage Functionalization

The Chemical Record, EarlyView.
Two decades of synthetic strategies for sulfur‐, selenium‐decorated coumarins are critically surveyed through 44 literature reports, with particular emphasis on derivatives functionalized at the C‐3 and C‐4 positions. This review reports the direct construction of the coumarin framework through cyclization processes and late‐stage functionalization of ...
Bruna R. Schneider, Laura D. de Avila, Mauricio C. D. F. Xavier, Alex F. C. Flores, Liane K. Soares, Gabriel P. da Costa, Angelita M. Barcellos   +6 more
wiley   +1 more source

Thermally Activated Delayed Fluorescence: An Extended Study of Peripherally Substituted DMAC‐TRZ Analogues

Chemistry – A European Journal, Volume 32, Issue 39, 22 October 2026.
A comprehensive experimental and theoretical study is presented of a family of TADF dyes. Comparing the behavior of structurally related dyes, we uncover the subtle and somewhat unexpected role of conformational degrees of freedom associated with peripheral groups that affect the delicate interplay of excited states that governs spin–orbit coupling ...
Andrea Landi, Ottavia Racchi, D. K. Andrea Phan Huu, Shohei Fukushima, Katsuaki Suzuki, Hironori Kaji, Cristina Sissa, Anna Painelli   +7 more
wiley   +1 more source

Molecular Structure of Heterocycles: 6. Solvent Effects on the 17O Nmr Chemical Shifts of 5-Trichloromethylisoxazoles

Journal of the Brazilian Chemical Society, 2001
A multilinear-regression analysis using the Kamlet-Abboud-Taft (KAT) solvatochromic parameters in order to elucidate and quantify the solvent effects on the 17O chemical shifts of three 5-trichloromethylisoxazoles [(1a) non-, (1b) 3-methyl- and (1c) 4 ...
Martins Marcos A. P., Freitag Rogério A., Zimmermanna Nilo E. K., Sinhorin Adilson P., Cúnico Wilson, Bastos Giovani P., Zanatta Nilo, Bonacorso Helio G.   +7 more
doaj  

Solvatochromic and Computational Study of Three Benzo-[f]-Quinolinium Methylids with Photoinduced Charge Transfer

Molecules
The solvatochromic properties of 48 solvents of three benzo-[f]-quinolinium methylids (BfQs) were analyzed within the theories of the variational model and Abe’s model of the liquid.
Mihaela Iuliana Avadanei, Ovidiu Gabriel Avadanei, Dana Ortansa Dorohoi   +2 more
doaj   +1 more source

Comparative Study of Two Spectral Methods for Estimating the Excited State Dipole Moment of Non-Fluorescent Molecules

Molecules
The electronic absorption spectral characteristics of cycloimmonium ylids with a zwitterionic structure have been analyzed in forty-three solvents with different hydrogen bonding abilities. The two ylids lack fluorescence emission but are very dynamic in
Mihaela Iuliana Avadanei, Dana Ortansa Dorohoi   +1 more
doaj   +1 more source

Fluorescence studies of photoactivated acidity of 2,2′-Dihydroxy-1,1′-Binaphthalene

International Journal of Photoenergy, 2003
Linear and multilinear relationships between some solvent polarity parameters and solvatochromic shifts of absorption and fluorescence of 2,2′-dihydroxy-1,1′-binaphthalene (DHBN) revealed strong charge transfer excitations (formation of S1,CT with higher
L. F. M. Ismail, M. S. A. Abdel-Mottaleb
doaj   +1 more source

Exploring Solvation Properties of Protic Ionic Liquids by Employing Solvatochromic Dyes and Molecular Dynamics Simulation Analysis

Liquids
Solvation properties are key for understanding the interactions between solvents and solutes, making them critical for optimizing chemical synthesis and biochemical applications.
Stuart J. Brown, Andrew J. Christofferson, Calum J. Drummond, Qi Han, Tamar L. Greaves   +4 more
doaj   +1 more source

The reactivity of a,b-unsaturated carboxylic acids. Part XVI. The kinetics of the reaction of cycloalkenylcarboxylic and cycloalkenylacetic acids with diazodiphenylmethane in various alcohols [PDF]

Journal of the Serbian Chemical Society, 2002
The rate constants for the reaction of diazodiphenylmethane with 1-cyclopentenecarboxylic, 1-cycloheptenecarboxylic, cyclopent-1-enylacetic and cyclohept-1-enylacetic acids were determined in eight alcohols at 30°C using the appropriate UV-spectroscopic ...
VERA V. KRSTIC, JASMINA B. NIKOLIC, GORDANA S. USCUMLIC   +2 more
doaj  

Physics-informed machine learning to predict solvatochromic parameters of designer solvents with case studies in CO2 and lignin dissolution

Green Chemical Engineering
The polarity of solvents plays a critical role in various research applications, particularly in their solubilities. Polarity is conveniently characterized by the Kamlet-Taft parameters that is, the hydrogen bonding acidity (α), the basicity (β), and the
Mood Mohan, Nikhitha Gugulothu, Sreelekha Guggilam, T. Rajitha Rajeshwar, Michelle K. Kidder, Jeremy C. Smith   +5 more
doaj   +1 more source

Chromo- and fluorophoric water-soluble polymers and silica particles by nucleophilic substitution reaction of poly(vinyl amine)

Beilstein Journal of Organic Chemistry, 2010
Novel chromophoric and fluorescent carbonitrile-functionalized poly(vinyl amine) (PVAm) and PVAm/silica particles were synthesized by means of nucleophilic aromatic substitution of 8-oxo-8H-acenaphtho[1,2-b]pyrrol-9-carbonitrile (1) with PVAm in water ...
Katja Hofmann, Ingolf Kahle, Frank Simon, Stefan Spange   +3 more
doaj   +1 more source