In this paper, we report two new 2H-pyran-3-carbonitrile derivatives having two different coumarin parental units with intramolecular charge transfer (ICT) and twisted intramolecular charge (TICT) properties. The absorption and emission spectra are studied in different organic solvents at room temperature. The dye 3b shows red shifted absorption and emission compared to the dye 3a because of the rigidized structure. 2H-pyran-3-carbonitrile derivatives exhibit strong fluorescence properties in various solvents and show positive solvatochromism. The dyes 3a and 3b show maximum fluorescence quantum yield in chloroform and tetrahydrofuran (ϕ: 0.81, 0.90). The bathochromic shift of absorption/emission spectra and increase in dipole moment after excitation of the dyes 3a and 3b indicate the intramolecular charge transfer (ICT)/Twisted intramolecular charge transfer (TICT) character of the emitting singlet state. Density functional theory (DFT) and time dependent-density functional theory (TD-DFT) computations have been used to understand the structural, molecular, electronic and photophysical parameters of the push-pull dyes. The ratio of ground to the excited state dipole moment of the synthesized dye is calculated with the help of Bakhshiev and Bilot–Kawski correlations.
Journal of Luminescence – Elsevier
Published: Aug 1, 2016
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.
All for just $49/month
Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.
Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.
It’s easy to organize your research with our built-in tools.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera