Temperature-dependent relaxation of excitons in tubular moleculular aggregates: Fluorescence decay and stokes shift

Article Abstract:

Temperature-dependent steady-state and time-resolved fluorescence studies are reported to probe the exciton dynamics in double-wall tubular J-aggregates formed by self-assembly of the dye 3,3'-bis(3-sulfopropyl)-5,5',6,6'-tetrachloro-1,1'-dioetylbenzimidacarbocyanine. At low temperatures, the experiments reveal a nonexponential decay of the fluorescence, with a typical time scale that depends on the emission wavelength.

Netherlands, Spectra, Optical properties

---

Charge-transfer excitons in DNA

Article Abstract:

The importance of intrachain and interchain coupling in charge-transfer (CT) excitons of DNA is investigated. The results prove that in oligomers and in duplex the exciton wave function is delocalized over several sites and that CT excitons in DNA have lower energy than single chain excitons, when the electron and hole polarons are opposite each other.

Biological Product (except Diagnostic) Manufacturing, Drugs, Deoxyribonucleic Acid, DNA, Charge transfer

---

On the low-temperature diffusion of localized Frenkel excitons in linear molecular aggregates

Article Abstract:

The peculiarities of the low-temperature diffusion of the (one-dimensional) 1D Frenkel excitons localized by a moderate diagonal disorder were theoretically studied. An aggregate as an open linear chain with uncorrelated on-site (diagonal) disorder that localizes the exciton at chain segments of size smaller than the full chain length was considered.

Chain reactions

Similar abstracts:

• Abstracts: Size-selective synthesis and stabilization of gold organosol in C(sub n)TAC: Enhanced molecular fluorescence from gold-bound fluorophores
• Abstracts: Enhanced intra-aggregate charge separation from binary exictons in mixed J-aggregates of cyanine dyes. Direct voltammetric observation of reversible and irreversible oxidations of two-dimensional J-aggregates of cyanine dye
• Abstracts: Orientational behavior of single molecules in molecular sieves: A study of oxazine dyes in AIPO(sub 4)-5 crystals
• Abstracts: Orientational behavior of single molecules in molecular sieves: A study of oxazine dyes in AIPO(sub 4)-5 crystals. part 2
• Abstracts: Influence of structural fluctuation on enzyme reaction energy barriers in combined quantum mechanical/molecular mechanical studies.

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.