Influence of disorder on electronic excited states: an experimental and numerical study of alkylthiotriphenylene columnar phases

Article Abstract:

Experiments were conducted to investigate the spectroscopic properties of the hexa-alkylthiotriphenylenes (H6TT) in solution and thin films. The conformation-spectra-intermediate neglect of differential overlap-configuration interaction by perturbative selected iterations (CS-INDO-CIPSI) were performed. The properties of the electronic excited states were obtained through quantum chemistry calculations. The data revealed that the energy and localization of the upper eigenstates were influenced by orientational disorder.

Thin films, Solution (Chemistry), Solutions (Chemistry), Excited state chemistry

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One- and two-photon ionization of DNA single and double helices studied by laser flash photolysis at 266 nm

Article Abstract:

The ionization of the DNA single and double helices (dA)20, (dT)20, (dAdT)10(dAdT)10 and (dA)20(dT)20 induced by nanosecond pulses at 266 nm was studied by time-resolved absorption spectroscopy. The results show that, in addition to two-photon ionization, one-photon ionization takes place for (dAdT)10(dAdT)10, (dA)20(dT)20 and (dA)20 but not for (dT)20.

Biological Product (except Diagnostic) Manufacturing, Drugs, Deoxyribonucleic Acid, Analysis, DNA, Ionization, Photolysis, Oxidative stress

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Triplet excitation transfer in triphenylene columnar phases

Article Abstract:

Interactions due to intermolecular orbital overlap, responsible for energy transport in the triplet state, are the driving force for singlet excitation transport. Triplet excitation transport in the columnar liquid crystal formed by tetrameric triphenylene derivative was carried out by transient absorption spectrascopy with a nanosecond resolution.

Usage, Optical properties, Energy transfer, Exciton theory, Excitons, Absorption spectra

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