A quantitative analysis of excitonic superhyperchromism in porphyrin J-/H-aggregates
CHEMICAL PHYSICS LETTERS, vol.391, no.4-6, pp.302-307, 2004 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 391 Issue: 4-6
- Publication Date: 2004
- Doi Number: 10.1016/j.cplett.2004.05.009
- Journal Name: CHEMICAL PHYSICS LETTERS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.302-307
- Middle East Technical University Northern Cyprus Campus Affiliated: Yes
Abstract
We argue that the mixing between energetically well-separated bands should have a magnified importance in the aggregates exhibiting an excitonic structure with a collective superstate, for which the J-/H-aggregates of porphyrins represent excellent examples. We present a quantitative account of the excitonic intensity borrowing in such systems and reveal a remarkably simple explanation of its enhancement: superhyperchromism is manifested by the mediation of the interband (Q-B) coupling between the two superstates (in Q and B) of such aggregates. The significance of the superhyperchromism is conveyed through its effects on the absorption spectrum of a natural 'porphyrin J-aggregate' - the chlorosome. (C) 2004 Elsevier B.V. All rights reserved.