NMR AND SPECTROSCOPIC STUDY ON 2,4-BIS(1-ALKYL-3,3-DIMETHYL-2-INDOLINYLIDENEMETHYL)-CYCLOBUTENEDIYLIUM-1,3-DIOLATE DYES

doi:10.7517/j.issn.1674-0475.1997.04.314

Abstract

Abstract: The structural characteristics and solvent effect on the absorption and fluorescence emission spectra of squaraine dyes are studied by their NMR, UV-VIS, and fluorescence spectra. The results indicate that the positive solvatochromism of these compounds are not obvious as expected and their structure and configuration in the ground state as well as the excited state are nearly the same. The whole molecule is in a nearly planar form and has a huge conjugate system. The relationships between molecular structure and charge distribution in the molecule, emission spectral feature are analyzed.

Key words: squaraine dye, correlated spectroscopy, solvatochromism, fluorescence spectra, configuration

LI Yiting, ZHOU Jinwei, ZHANG Fushi, WANG Yanqiao, SONG Xinqi. NMR AND SPECTROSCOPIC STUDY ON 2,4-BIS(1-ALKYL-3,3-DIMETHYL-2-INDOLINYLIDENEMETHYL)-CYCLOBUTENEDIYLIUM-1,3-DIOLATE DYES[J]. Imaging Science and Photochemistry, 1997, 15(4): 314-320.

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