Effective shape and dynamics of chlorophyll a in a nematic liquid crystal

Article Abstract:

The ordering matrix and molecular dynamics of chlorophyll a in a nematic liquid crystal were investigated at different temperature ranges using a time-dependent fluorescence depolarization technique. Specifically, the three rotational diffusion tensor components of chlorophyll a dissolved in the nematic liquid crystal ZLI-1167 were examined. Experimental results showed that the axis normal to the porphyrin ring was aligned on average perpendicular to the director and displayed the slowest tumbling with respect to the director. The phytyl chain also appeared to be aligned with the director.

Analysis, Photosynthesis research, Molecular dynamics, Spectra, Chlorophyll, Liquid crystals, Molecular rotation

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Conversion of intramolecular singlet electron transfer at room temperature into triplet energy transfer at 77 K: Photoisomerization in norbornadiene- and carbazole-labeled poly(aryl ether) dendrimers

Article Abstract:

A series of Frechet-type poly(aryl ether) dendrimers (CZ-Gn-NBD, n = 1-3) with carbazole (CZ) chromophores and a norbornadiene (NBD) group attached to the periphery and the core, respectively, are synthesized and their photophysical and photochemical properties are investigated. The intramolecular singlet electron transfer and triplet energy transfer in CZ-Gn-NBD proceed via a through-space mechanism that involves the proximate donor and acceptor groups.

Isomerization, Chromophores, Energy transformation

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Femtosecond transient absorption studies of energy transfer within chromophore-labeled dendrimers

Article Abstract:

Dendrimers possessing coumarin-2 dyes at the periphery and either a cumarin-343 has been studied by femtosecond transient absorption spectroscopy to elucidate energy transfer rate constants. The measured rate constants for energy transfer correlates extremely well with the theoretical rate constants.

Optical properties, Energy transfer, Absorption spectra

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