BMOLogo
Publications

LMU München
Fakultät für Physik


Home

General
Research
Members
Publications
  All Publications
  PhD Theses
  Master Theses
  Search





Impressum
(c) 2002 BMO

"Solvent dependent excited state spectral properties of 4-hydroxyacridine: Evidence for only water mediated excited state proton transfer process"
Rupashree Balia Singh, Subrata Mahanta and Nikhil Guchhait
Journal of Photochemistry and Photobiology A: Chemistry, 200, 325-333 (2008)


Abstract:
The possibility of ground and excited state proton transfer reaction across the five member intramolecular hydrogen bonded ring in 4-hydroxyacridine (4-HA) has been investigated spectroscopically and the experimental results have been correlated with quantum chemical calculations. The difference in the emissive behaviour of 4-HA in different types of solvents is due to the presence of different species in the excited state. In non-polar solvents, the species present is non-fluorescing in nature, whereas 4-HA molecule shows normal emission from intramolecularly hydrogen bonded closed conformer in polar aprotic solvents. In polar protic solvents like MeOH, EtOH, etc. (except water), a single broad emission band is attributed to the hydrogen bonded solvated form of 4-HA. However, in case of water, fluorescence from the tautomeric form of 4-HA is observed apart from emission from the solvated form. Emission from the tautomeric form may arise due to double proton transfer via a single water molecule bonded to 4-HA. Evaluation of the potential energy surfaces by quantum chemical calculations using density functional theory (DFT) and time dependent density functional theory (TDDFT), however, points towards the possibility of proton transfer—both intrinsic intramolecular as well as water mediated in the first excited state of 4-HA.

This publication has not been written at BMO

BMO authors (in alphabetic order):
Subrata Mahanta
Rupashree Balia Singh


WWW-Version

mailto: webmaster
Letzte Änderung: 2016-09-14 13:34
-------------------------------------------
nav.inc[abfrage], query:Delete from kurzzeitstatistik where TS<"1711620432"
-------------------------------------------
ERRNO: 0
-------------------------------------------
RESULT:
-------------------------------------------
ABORTED
-------------------------------------------
-------------------------------------------
nav.inc[abfrage], query:INSERT INTO kurzzeitstatistik (Datei, Adresse, id, TS) VALUES ("", "34.204.196.206" , "2752" , "1711621032 " )
-------------------------------------------
ERRNO: 0
-------------------------------------------
RESULT:
-------------------------------------------
ABORTED
-------------------------------------------
-------------------------------------------
nav.inc[abfrage], query:INSERT INTO statistik (Datei, Adresse, id, TS, Laufzeit) VALUES ("", "34.204.196.206" , "2752" , "1711621032 ","" )
-------------------------------------------
ERRNO: 0
-------------------------------------------
RESULT:
-------------------------------------------
ABORTED
-------------------------------------------