Synthesis and Properties of Photoluminescent 1,4‐Bis‐(α‐cyano‐4‐methoxystyryl)benzenes.

doi:10.1002/CHIN.200240102

Paper

Synthesis and Properties of Photoluminescent 1,4‐Bis‐(α‐cyano‐4‐methoxystyryl)benzenes.

Published Jun 28, 2002 · C. Loewe, C. Weder

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Abstract

1,4-Bis-(α-cyano-4-methoxystyryl)benzene (1a) and 1,4-bis-(α-cyano-4-methoxystyryl)-2,5-dimethoxybenzene (1b) were synthesized by the Knoevenagel reaction of (4-methoxyphenyl)acetonitrile with terephthaldicarboxyaldehyde and 2,5-dimethoxy terephthaldicarhoxyaldehyde, respectively. Both phenylene vinylene oligomers are highly photoluminescent, and the comparison of the emission spectra of the crystalline solids with the ones of the corresponding low-viscosity molecular solutions reveals, particularly in case of 1b, an extremely large bathochromic shift. This effect is consistent with the formation of excimers that are characterized by low-bandgap emission With the objective to control the emission characteristics of these dyes beyond the limiting states of molecular solution and crystalline solid, the investigation of their photophysical characteristics was extended to the liquid crystalline state and the isotropic melt, as well as to blends with isotactic polypropylene.

Study Snapshot

Photoluminescent 1,4-bis-(-cyano-4-methoxystyryl)benzenes (1a and 1b) were synthesized, with both showing high photoluminescence and potential for applications in low-bandgap emission.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

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Paper

Synthesis and Properties of Photoluminescent 1,4‐Bis‐(α‐cyano‐4‐methoxystyryl)benzenes.

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References

Essentials of Molecular Photochemistry

This paper explores the fundamentals of molecular photochemistry, including electronic structure, radiation, and various photochemical reactions involving different organic chromophores.

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