fulltext.study @t Gmail

Solvent polarity and intramolecular hydrogen bonding effects on the photophysical properties of 1-amino-9,10-anthraquinone dye

Paper ID Volume ID Publish Year Pages File Format Full-Text
28552 44080 2006 10 PDF Available
Title
Solvent polarity and intramolecular hydrogen bonding effects on the photophysical properties of 1-amino-9,10-anthraquinone dye
Abstract

Photophysical properties of 1-amino-9,10-anthraquinone (1AAQ) dye have been investigated in different solvents using steady-state and time-resolved fluorescence measurements. The behavior of the dye is different in nonpolar solvents than in other solvents of moderate to higher polarities. In nonpolar solvents, the absorption and fluorescence maxima (ν¯abs and ν¯fl, respectively) are largely blue-shifted and fluorescence quantum yields (Φf) and fluorescence lifetimes (τf) are unusually higher in comparison to those in other solvents. Further, in nonpolar solvents, the fluorescence decay kinetics is strongly temperature-dependent, while decay kinetics is temperature-independent in all other solvents of moderate to higher polarities. The differences in the behavior of 1AAQ dye in nonpolar and other solvents are suggestive of a structural change in the dye in the two sets of solvents. It is inferred that this structural change arises through the 1-NH2 group of the dye. Deuterium isotope effect on the fluorescence decays of the dye in nonpolar and polar solvents also supports the above structural changes. To obtain further supportive evidences for the above structural changes, ab initio quantum chemical studies have been carried out on the ground and excited state structures of the dye under different environmental conditions. Correlating different experimental and theoretical results we infer that in nonpolar solvents 1AAQ dye adopts a nonplanar conformation where as in all other solvents the dye adopts a planar conformation with strong intramolecular charge transfer (ICT) character. Present results also indicate a strong role of intramolecular hydrogen bonding on the deexcitation mechanism of the excited state of the dye both in its nonplanar and planar ICT structures.

Keywords
Photophysical properties; Quinone dyes; Intramolecular hydrogen bonding; Solvent polarity; Intramolecular charge transfer; Nonplanar structure
First Page Preview
Solvent polarity and intramolecular hydrogen bonding effects on the photophysical properties of 1-amino-9,10-anthraquinone dye
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 181, Issues 2–3, 31 July 2006, Pages 338–347
Authors
, , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us