Aggregation-Enhanced Fluorescence and Two-Photon Absorption in Nanoaggregates of a 9,10-Bis[4′-(4″-aminostyryl)styryl]anthracene Derivative
This paper reports the design, synthesis, and theoretical modeling of two‐photon properties of a new class of chromophore that exhibits enhanced two‐photon absorption (TPA) and subsequently generated strong up‐converted emission in nanoaggregate forms. This chromophore utilizes the basic structural...
Saved in:
Published in | Advanced functional materials Vol. 16; no. 18; pp. 2317 - 2323 |
---|---|
Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
WILEY-VCH Verlag
04.12.2006
WILEY‐VCH Verlag |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | This paper reports the design, synthesis, and theoretical modeling of two‐photon properties of a new class of chromophore that exhibits enhanced two‐photon absorption (TPA) and subsequently generated strong up‐converted emission in nanoaggregate forms. This chromophore utilizes the basic structural unit of 9,10‐bis[4′‐(4″‐aminostyryl)styryl]anthracene that exhibits large internal rotation in the monomer form in organic solvents, whereby the fluorescence is greatly reduced. In nanoaggregates formed in water, the internal rotation is considerably hindered, leading to significant increases of TPA and fluorescence quantum yield. Theoretical modeling of the conformational structure and dynamics has utilized a semiempirical pm3 formalism. The TPA cross sections of the monomer and the aggregate states have been calculated on the basis of the quadratic response theory applied to a single‐determinant self‐consistent field reference state making use of a split‐valence 6‐31G* basis set.
A severely distorted 9,10‐bis[4'‐(4''‐aminostyryl)styryl]anthracene derivative (see figure) exhibits enhanced two‐photon absorption and subsequently generates strong up‐converted fluorescence upon nanoaggregation because of the planarization of π‐conjugation and the reduced intermolecular interaction by loose stacking. |
---|---|
Bibliography: | Post-doctoral Fellowship Program of the Swedish Foundation for International Cooperation in Research and Higher Education Post-doctoral Fellowship Program of Korea Science & Engineering Foundation This work was supported in part by a grant from the directorate of Chemistry and Life Science of the Air Force office of Scientific Research, in part by a grant from DMR, international program of the National Science Foundation, in part by the Post-doctoral Fellowship Program of Korea Science & Engineering Foundation (KOSEF), and in part by the Post-doctoral Fellowship Program of the Swedish Foundation for International Cooperation in Research and Higher Education (STINT). We thank Dr. Marek Samoc at Laser Physics Centre, Australian National University for helpful discussions. Supporting Information is available online from Wiley InterScience or from the author. ArticleID:ADFM200500928 istex:22D255F062E1AB2D0B58DB6706BB48FBC14AF36F DMR Air Force office of Scientific Research ark:/67375/WNG-XX5W8TZV-D This work was supported in part by a grant from the directorate of Chemistry and Life Science of the Air Force office of Scientific Research, in part by a grant from DMR, international program of the National Science Foundation, in part by the Post‐doctoral Fellowship Program of Korea Science & Engineering Foundation (KOSEF), and in part by the Post‐doctoral Fellowship Program of the Swedish Foundation for International Cooperation in Research and Higher Education (STINT). We thank Dr. Marek Samoc at Laser Physics Centre, Australian National University for helpful discussions. Supporting Information is available online from Wiley InterScience or from the author. ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1616-301X 1616-3028 |
DOI: | 10.1002/adfm.200500928 |