Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 131, Issue 12, Pages 4267-4278Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja806853v
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Funding
- NSF [0606028]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0606028] Funding Source: National Science Foundation
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Using vibronic exciton theory we evaluate the absorption and CID spectra of lutein and lutein diacetate aggregates, which have previously been described as card-packed H-aggregates and head-to-tail J-aggregates, respectively. The dramatically different spectral line shapes for both aggregates are shown to arise from strongly and weakly coupled H-aggregates consisting of helical arrays of chromophores. For lutein, the aggregates consist of tightly packed stacks of individual carotenoid molecules, while lutein diacetate aggregates resemble nematic liquid crystals. For both aggregates the agreement between experiment and theory is excellent. Analytical expressions for the absorption and CD spectra are presented, highlighting the spectral signatures of weakly coupled H (and J)-aggregation arising from distortions in the single-molecule Franck-Condon progression.
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