Enhanced intra-aggregate charge separation from binary exictons in mixed J-aggregates of cyanine dyes

Article Abstract:

Two-dimensional, amalgamation-type J-aggregates consisting of two different kinds of structurally analogous anionic cyanine dyes are self-assembled on an amino-functionalized Au(111) electrode surface and characterized. Results reveal that the enhanced charge separation leads to a high-efficiency photocurrent generation with a simple binary J-aggregate-coated Au(111) electrode in a reversible redox solution and results in strong quenching of the fluorescence from the corresponding aggregate grown in solution free from substrate-induced quenching.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Gold Compounds, Electric properties, Electrodes, Structure

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Contribution of electrostatic cohesive energy in two-dimensional J-aggregation of cyanine dye

Article Abstract:

A study was conducted to analyze the effects of collective Coulomb interaction involving the cationic dye chromophores and counteranions to the cohesive energy for two dimensional J-aggregation. The ESCA-750 spectrometer was utilized to carry out x-ray photoelectron spectroscopy experiments. Results indicated that atomically flat Ag(111) films supporting a halide monolayer and pseudo AgX(111) model surface promotes well-ordered two-dimensional J-aggregates of cyanine dyes.

Analysis, Molecular dynamics, Electrostatics, Anions, Dyes and dyeing, Dyeing, Dyes

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Direct voltammetric observation of reversible and irreversible oxidations of two-dimensional J-aggregates of cyanine dye

Article Abstract:

An apparently more direct experimental approach ids introduced for the redox levels of J-aggregation by making use of a remarkably uniform two dimensional (2D) J-aggregate monolayer of an anionic thiacarbocyanine dye. The results indicate that the J-aggregation caused concurrent upward and downward shifts in the dye HOMO and LUMO levels.

Oxidation-reduction reaction, Oxidation reduction reactions, Chemistry, Physical and theoretical, Physical chemistry, Cyanides, Chemical properties

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