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Journal:

Dyes and pigments

Key Words:

Monomethine indocyanine dye Microwave irradiation UV–Vis spectra IR spectra TD-DFT/PCM

Abstract:

Four asymmetric monomethine indocyanine dyes were rapidly synthesized by the condensation of indole quaternary salts with 2-methylthio quinoline quaternary salt in the presence of triethylamine under solvent-free, microwave irradiation. The effects of microwave power and irradiation time on yield were examined. The products were identified using elemental analysis, IR, MS, UV–Vis spectra, 1H and 13C NMR. The absorption of the dyes was investigated both experimentally and theoretically. Calculations performed using a combination of the time-dependent density functional theory (TD-DFT) and the polarizable continuum model (PCM) reproduced the p / p* type absorption bands of the dyes. Multiple linear regression, applied to the theoretical absorption maxima in different solvents, fitted well with experimental data. Resonance frequency calculations were undertaken to study the IR spectra of the dyesand the calculated results were in good accordance with experimental values

Co-author:

Wei Huang,Chun-Lan Li,Yong-Sheng Wei,Yi Huang,Xiang-Han Zhang,Zhen-Yi Wen,Zu-Xun Zhang

First Author:

Yi-Le Fu

Indexed by:

Journal paper

Correspondence Author:

Lan-Ying Wang

Volume:

82

Issue:

3

Page Number:

409-415

Translation or Not:

no

Date of Publication:

2009-01-01

Included Journals:

SCI