AI Article Synopsis
- A study was conducted on eight carbazole-cyanoacrylate donor-acceptor dyes, focusing on how changing the thiophene bridge and acceptor type (from acid to ester) affects their properties.
- Techniques like electronic spectroscopy, Raman spectroscopy, and computational modeling were used to analyze the dyes, revealing that increasing the bridge length leads to a red shift in energy transition, allowing some tuning of dye absorption.
- It was found that the charge transfer nature of the dyes decreases with longer bridges, meaning the bridge becomes less involved in electronic interactions with the acceptor as it gets longer.
Article Abstract
A series of eight carbazole-cyanoacrylate based donor-acceptor dyes were studied. Within the series the influence of modifying the thiophene bridge, linking donor and acceptor and a change in the nature of the acceptor, from acid to ester, was explored. In this joint experimental and computational study we have used electronic absorbance and emission spectroscopies, Raman spectroscopy and computational modeling (density functional theory). From these studies it was found that extending the bridge length allowed the lowest energy transition to be systematically red shifted by 0.12 eV, allowing for limited tuning of the absorption of dyes using this structural motif. Using the aforementioned techniques we demonstrate that this transition is charge transfer in nature. Furthermore, the extent of charge transfer between donor and acceptor decreases with increasing bridge length and the bridge plays a smaller role in electronically mixing with the acceptor as it is extended.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6017769 | PMC |
| http://dx.doi.org/10.3390/molecules23020421 | DOI Listing |
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