Synthesis and spectroscopic studies of 4-Formyl-4'-N,N-dimethylamino-1,1'-biphenyl: The unusual red edge effect and efficient laser generation

P T Chou; C P Chang; J H Clements; K Meng-Shin

doi:10.1007/BF01152563

Synthesis and spectroscopic studies of 4-Formyl-4'-N,N-dimethylamino-1,1'-biphenyl: The unusual red edge effect and efficient laser generation

J Fluoresc. 1995 Dec;5(4):369-75. doi: 10.1007/BF01152563.

Authors

P T Chou¹, C P Chang, J H Clements, K Meng-Shin

Affiliation

¹ Department of Chemistry and Biochemistry, University of South Carolina, 29208, Columbia, South Carolina.

PMID: 24226913
DOI: 10.1007/BF01152563

Abstract

The synthesis and photophysics of 4-formyl-4'-N,N-dimethylamino-1,1'-biphenyl are reported. The emission spectrum in various solvent polarities demonstrates solvatochromism, indicating that the fluorescence originates from an electronically excited species with a strong charge transfer character. The change in Δ[Formula: see text] [[Formula: see text] max(absorption) -[Formula: see text] max(emission)] varies from ∼1500 cm(-1) inn-heptane to as much as ∼7500 cm(-1) in acetonitrile. In protic solvents, the unusual excitation energy-dependent steady-state emission (red edge effect), resulting from solvent dielectric relaxation, was observed in media with a low viscosity. The large Stokes-shifted and high-yield fluorescence led to the observation of the efficient lasing action. The frequency tunability of the laser output is strongly solvent dependent, generating a new charge transfer laser dye in the blue-green region.