Photophysical properties of coumarin-30 dye in aprotic and protic solvents of varying polarities

Photochemistry and Photobiology
Sadasivam SenthilkumarHaridas Pal

Abstract

Experimental results on various photophysical properties of coumarin-30 (C30) dye, namely, Stokes' shift (Deltanu), fluorescence quantum yield (Phi(f)), fluorescence lifetime (tau(f)), radiative rate constant (k(f)) and nonradiative rate constant (k(nr)), as obtained using absorption and fluorescence measurements have been reported. Though in most of the solvents the properties of C30 show more or less linear correlation with the solvent polarity function, Deltaf = [(epsilon - 1)/(2epsilon + 1) - (n(2) - 1)/(2n(2) + 1)], they show unusual deviations in nonpolar solvents at one end and in high-polarity protic solvents at the other end. From the solvent polarity and temperature effect on the photophysical properties of the dye, following inferences have been drawn: (1) in nonpolar solvents, the dye exists in a nonpolar structure, where its 7-NEt(2) substituent adopts a pyramidal configuration and the amino lone pair is out of resonance with the benzopyrone pi cloud; (2) in medium to higher polarity solvents, the dye exists in a polar intramolecular charge transfer structure, where the 7-NEt(2) group and the 1,2-benzopyrone moiety are in the same plane and the amino lone pair is in resonance with the benzopyrone pi cloud; (3) in p...Continue Reading

References

Jan 16, 2003·Bioconjugate Chemistry·Volker BuschmannMarkus Sauer

❮ Previous
Next ❯

Citations

Jul 12, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Eunkyung JiDavid G Whitten
Nov 21, 2012·Acta Crystallographica. Section B, Structural Science·Yvon Bibila Mayaya BisseyouChristian Jelsch
Aug 6, 2014·The Journal of Physical Chemistry. a·Poonam Verma, Haridas Pal
Mar 22, 2018·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology· ShivrajAbdulaziz Abdullah Alkheraif
Nov 23, 2017·Photochemistry and Photobiology·Masahiko Taniguchi, Jonathan S Lindsey
Jul 31, 2018·Photochemistry and Photobiology·Chamari S WijesooriyaEmily A Smith
Jul 11, 2008·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Wenwei ZhaoJianping Wang
Jun 30, 2009·Photochemistry and Photobiology·D Sahoo, S Chakravorti
Jul 14, 2011·Physical Chemistry Chemical Physics : PCCP·Debjani RoyRobert A Walker
Feb 20, 2014·Photochemistry and Photobiology·Banibrata MaityDebabrata Seth
Jun 9, 2005·Photochemistry and Photobiology·Ashish SatpatiHaridas Pal
Jul 8, 2009·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Thomas S CorbittDavid G Whitten
Jun 3, 2010·Applied Optics·Milan P PoudelHans A Schuessler
Feb 2, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Marion MilleSuzanne Fery-Forgues
Mar 16, 2011·The Journal of Organic Chemistry·Subhendu Sekhar Bag, Rajen Kundu
Aug 16, 2011·The Journal of Physical Chemistry. B·Namasivayam DhenadhayalanPerumal Ramamurthy
Apr 30, 2014·The Journal of Physical Chemistry. B·Cristina MartinAbderrazzak Douhal
Jun 3, 2014·The Journal of Physical Chemistry. B·Nilotpal BarooahAchikanath C Bhasikuttan
Dec 30, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Eunkyung JiKirk S Schanze

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.