Influence of interchain interactions on the electronic properties of neutral and charged oligodiacetylenes carrying bulk substituents

Article Abstract:

The effect of the interchain interactions on the electronic properties of a 'dimer', named [CHD(sub 4)](sub 2), built from two molecules of a fully carbazolyl-substituted oligodiacetylene containing four repeating units is discussed. The simulated photoinduced absorption spectra indicate a substituent-induced strong interaction between the oligomers, due to the very large amount of excess charge on the distorted oligomer, which is spread over its carbazolyl moieties.

Electric properties, Acetylene

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Interchain electronic excitations in poly(phenylenevinylene) (PPV) aggregates

Article Abstract:

The semiempirical collective electronic oscillators (CEO) approach based on a time-dependent Hartree-Fock approximation is applied to analyze formation of interchain electronic excitations in PPV aggregates composed of two weakly coupled chain segments. New low-frequency interchain electronic excitations appear upon bringing oligomer chains into close proximity (3-4 A).

Phenyl group

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Higher triplet excited states of oligo(p-phenylenevinylene)s

Article Abstract:

Properties of the higher excited triplet states of oligo(p-phenylenevinylene)s (OPVn) are investigated with use of the ns-ps and ns-ns two-color two-laser flash photolysis techniques. The lowest triplet excited states of OPVn are generated through the triplet energy transfer process by the first 355-nm laser indication to the triplet sensitizer.

Methods, Energy transfer, Phenyl compounds

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