Hydrogen Bonding and Protonation Effects on Excited-state Electron Transfer in meta and para-Dialkylaminopyridines

Szydłowska, I.; Nowacki, J.; Zielińska, A.; Herbich, J.

Artykuł - szczegóły

Tytuł artykułu

Hydrogen Bonding and Protonation Effects on Excited-state Electron Transfer in meta and para-Dialkylaminopyridines

Autorzy

Szydłowska I. , Nowacki J. , Zielińska A. , Herbich J.

Identyfikatory

Warianty tytułu

Języki publikacji

Abstrakty

Synthetic, spectral and photophysical investigations were performed for a series of dialkylaminopyridines (DAAPs) representing electron donor-acceptor systems. 4-Dimethyl aminopyridine and its analogues, substituted by an electron donor at the para position of the acceptor ring, show solvent-dependent dual luminescence from the substrate (primary excited state) and the product (TICT state) of the photoinduced electron transfer process. The investigations in mixed solvents (n-hex ane + 1-butanol) allow us to prove that dual luminescence is observed for 1:1 complexes of 4-DAAPs with the alcohol molecule hydrogen-bonded to the pyridine nitrogen atom. Contrary to 4-DAAPs, the electronic structure and geometry of the fluorescent CT state of 3-diisopropyl amino-pyridine are solvent-dependent (this 1CT state does not correspond to a full separation of charges). The spectroscopic and photophysical properties of the protonated forms of DAAPs are also presented. It is note worthy that the monocations of 4-diisopropyl-aminopyridine exhibit TICT fluorescence.

Słowa kluczowe

dialkylaminopyridines photoinduced intramolecular electron transfer dual fluorescence TICT state hydrogen bonding and protonation effects

Wydawca

Polskie Towarzystwo Chemiczne

Czasopismo

Polish Journal of Chemistry

Rocznik

2008

Tom

Vol. 82, nr 4

Strony

847--864

Opis fizyczny

Bibliogr. 48 poz., rys.

Twórcy

autor

Szydłowska I.

autor

Nowacki J.

autor

Zielińska A.

autor

Herbich J.

Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland, herbich@ichf.edu.pl

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Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-article-BUJ6-0024-0098