Ultrafast excited state dynamics of trans-[4-(4′-dimethylaminostyryl) ] pyridine N-oxide in solution: Femtosecond fluorescence up-conversion and theoretical calculations

Anna Szemik-Hojniak*, Irena Deperasińska, Krzysztof Oberda, Yuval Erez, Dan Huppert, Yakov P. Nizhnik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The results of the steady-state and time-resolved fluorescence-spectroscopy measurements and DFT calculations for trans-[4-(4′-dimethylaminostyryl)] pyridine N-oxide (trans-DPO) in various solvents are presented. These results are similar to those reported in the literature for trans-4-(dimethylamino)- 4′-cyanostilbene (DCS) where the S1 emissive state shows the charge-transfer (CT) nature. Alcohol solvents, however, have aroused our particular interest because hydrogen-bonded complexes are formed between them and the trans-DPO molecule. They demonstrate a stronger CT character of the lower lying excited state and a larger separation between the first and the second absorption band than in the free trans-DPO molecule. The different effects found in time-dependent femtosecond up-conversion (performed for several emission wavelengths in dioxane and methanol solution over the time range 0-40 ps) were assigned to the hydrogen bond assisted charge transfer process in trans-DPO in methanol, to the excited-state solvation dynamics and mainly to solvent relaxation of trans-DPO dissolved in dioxane and methanol.

Original languageEnglish
Pages (from-to)9914-9923
Number of pages10
JournalPhysical Chemistry Chemical Physics
Volume15
Issue number24
DOIs
StatePublished - 28 Jun 2013

Fingerprint

Dive into the research topics of 'Ultrafast excited state dynamics of trans-[4-(4′-dimethylaminostyryl) ] pyridine N-oxide in solution: Femtosecond fluorescence up-conversion and theoretical calculations'. Together they form a unique fingerprint.

Cite this