{"title":"Dependence of photophysical properties on stereoisomers: The case of nonsymmetric 2-aryl(benz)imidazole-annulated derivatives","authors":"","doi":"10.1016/j.jphotochem.2024.115936","DOIUrl":null,"url":null,"abstract":"<div><p>Nonsymmetric 2-aryl (benz)imidazole derivatives were previously synthesized via C-H/N-H annulation of imidazole derivatives from lapachol moieties with internal alkynes as an efficient tool to increase the π-system of lapimidazole derivatives. To investigate their photophysical properties, time-resolved and steady-state fluorescence measurements were carried out on dropcast film, powder, and diluted solution. Despite having the same number of single and double bonds, slight differences in their structures lead to distinct photophysical properties. The time-correlated single-photon counting measurements also demonstrated that the aspects of the temporal decay curves are dependent on the treatment of the samples during the measurements. The decay curves were relatively well fitted using an alternative method based on the exponentially modified Gaussian function, giving rise to a more complete set of fitting parameters. Finally, theoretical calculations corroborate that small structural changes in molecules can significantly alter their conformational dynamics, electronic spectra, and overall electronic behavior and stability.</p></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":null,"pages":null},"PeriodicalIF":4.1000,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1010603024004805/pdfft?md5=497add43b98068b47054eb47710e4fdb&pid=1-s2.0-S1010603024004805-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Photochemistry and Photobiology A-chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1010603024004805","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Nonsymmetric 2-aryl (benz)imidazole derivatives were previously synthesized via C-H/N-H annulation of imidazole derivatives from lapachol moieties with internal alkynes as an efficient tool to increase the π-system of lapimidazole derivatives. To investigate their photophysical properties, time-resolved and steady-state fluorescence measurements were carried out on dropcast film, powder, and diluted solution. Despite having the same number of single and double bonds, slight differences in their structures lead to distinct photophysical properties. The time-correlated single-photon counting measurements also demonstrated that the aspects of the temporal decay curves are dependent on the treatment of the samples during the measurements. The decay curves were relatively well fitted using an alternative method based on the exponentially modified Gaussian function, giving rise to a more complete set of fitting parameters. Finally, theoretical calculations corroborate that small structural changes in molecules can significantly alter their conformational dynamics, electronic spectra, and overall electronic behavior and stability.
期刊介绍:
JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds.
All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor).
The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.