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Tuning the photodriven electron transport within the columnar perylenediimide stacks by changing the π-extent of the electron donors

Title
Tuning the photodriven electron transport within the columnar perylenediimide stacks by changing the π-extent of the electron donors
Authors
Supur M.Fukuzumi S.
Ewha Authors
Shunichi Fukuzumi
SCOPUS Author ID
Shunichi Fukuzumiscopus
Issue Date
2013
Journal Title
Physical Chemistry Chemical Physics
ISSN
1463-9076JCR Link
Citation
vol. 15, no. 7, pp. 2539 - 2546
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Photodriven electron-transport properties of the self-assemblies of N,N′-di(2-(trimethylammoniumiodide)ethylene)perylenediimide stacks (TAIPDI)n with three electron donors, disodium 4,4′-bis(2- sulfonatostyryl)biphenyl (BSSBP, stilbene-420), sodium 9,10-dimethoxyanthracene- 2-sulfonate (DANS) and disodium 6-amino-1,3-naphthalenedisulfonate (ANADS) have been studied in water. These electron donors vary in their π-extent to adjust the electronic coupling and the distance with the PDI stacks. Possessing the largest π-extent, BSSBP has strong π-π interactions as well as ionic interactions with (TAIPDI)n. Instead of π-stacking with TAIPDI planes, DANS and ANADS, with a relatively small π-extent, are embedded in the side chains of TAIPDIs via ionic interactions, resulting in a distance increment from the aromatic TAIPDI cores. After excitation, the BSSBP-(TAIPDI)n system exhibits fast charge separation (0.70 ps) and relatively slow charge recombination (485 ps) due to intermolecular electron delocalization along the TAIPDI stacks. On the other hand, charge separation in DANS-(TAIPDI)n and ANADS-(TAIPDI)n occurs within 1.5 and 1.6 ns, respectively, calculated from the quenching of singlet excited states. The lifetimes of charge-separated states are determined to be 44 and 96 μs, at least 105 times slower than that of BSSBP-(TAIPDI)n due to remarkably improved electron transport throughout the (TAIPDI)n. © 2013 the Owner Societies.
DOI
10.1039/c2cp44106c
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자연과학대학 > 화학·나노과학전공 > Journal papers
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