Tuning NIR Absorption and Emission of Diphenyl-Dihydrophenazine-Based Merocyanines with Ultra Narrow Band Gap

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F26%3A0200447" target="_blank" >RIV/00216305:26310/26:0200447 - isvavai.cz</a>
Alternative codes found
RIV/00216275:25310/25:39923169
Result on the web
<a href="https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/chem.202501864" target="_blank" >https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/chem.202501864</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/chem.202501864" target="_blank" >10.1002/chem.202501864</a>

Result language
angličtina
Original language name
Tuning NIR Absorption and Emission of Diphenyl-Dihydrophenazine-Based Merocyanines with Ultra Narrow Band Gap
Original language description
Five merocyanine derivatives with a 5,10-diphenyl-dihydrophenazine donor and various indanone-and indandione based-acceptors with one or two dicyanovinylene groups were prepared by Knoevenagel condensation for tuning absorption and fluorescence in the near-infrared region. Molecular conformation, bond length alternation, and molecular packing in the solid state were studied by X-ray diffraction of single crystals in combination with density functional theory (DFT) calculations. By enhancing electron-accepting ability, a considerable decrease of lowest unoccupied molecular orbitals (LUMO) energy by 1.01 eV and retained highest occupied molecular orbitals (HOMO) energy within 0.13 eV were estimated by cyclic and rotating disc electrode voltammetry, relating semi-quantitatively to DFT prediction. Optical properties in solutions with various polarity, neat amorphous films, and crystalline powder states were studied. The absorption maxima of the neat films evolved from 545 nm to 931 nm. An ultranarrow optical band gap of DPPZ-IDD (1.09 eV) was found from the onset of thin film absorption and well agreed with the electrochemical gap of 0.93 eV. Detectable fluorescence in the NIR region was observed in the film and polycrystalline powder states.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10400 - Chemical sciences

Project
<a href="/en/project/GA24-10479S" target="_blank" >GA24-10479S: Near-infrared emitting molecular crystals for next generation imaging (Crystal-NIR)</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)