Influence of core-substitution on the ultrafast charge separation and recombination in arylamino core-substituted naphthalene diimides

Autor:	Frank Würthner, Eberhard Riedle, Igor Pugliesi, Sabin-Lucian Suraru, Stefan Lochbrunner, Uwe Megerle
Rok vydání:	2011
Předmět:	chemistry.chemical_compound Chemical substance chemistry Band gap Excited state Relaxation (NMR) Ultrafast laser spectroscopy Substituent General Physics and Astronomy Charge (physics) Physical and Theoretical Chemistry Photochemistry Naphthalene
Zdroj:	Chemical Physics Letters. 504:24-28
ISSN:	0009-2614
DOI:	10.1016/j.cplett.2011.01.038
Popis:	We study the charge separation and recombination of two arylamino core-substituted naphthalene diimides by transient absorption. Both compounds show a 3 ps relaxation from the initially excited partial to the full charge transfer state. Quantum chemical calculations show that this process is associated with a twisting of the arylamino substituent. In the twisted conformation the energy gap between ground and excited state is 0.7 eV for two amino core-substituents and 0.5 eV for one amino and one chloro core-substituent. The larger energy gap leads to a six-fold increase in the lifetime of the fully charge separated state from 11 to 70 ps.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8ae72800759ea5d708e6e5c8dcdee7ce https://doi.org/10.1016/j.cplett.2011.01.038 Zobrazit plný text záznamu Full Text from ScienceDirect