The charge transfer mechanism and spectral properties of a near-infrared heptamethine cyanine dye in alcoholic and aprotic solvents

Li Chuan Zhou, Guang Jiu Zhao, Ji Feng Liu, Ke Li Han, Yun Kou Wu, Xiao Jun Peng, Meng Tao Sun

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

The charge transfer mechanism of a synthesized near-infrared (NIR) heptamethine cyanine dye has been studied with 3D real space analysis method. A new phenomenon about the intramolecular charge transfer (ICT) process is observed: the sulfonate (-SO3-) groups are mainly concerned with the ICT process. The electrons can transfer from the sulfonate (-SO3-) groups to the bridgehead amine and the electron-defect conjugated system. And the absorption and fluorescence spectra of the ICT state in alcoholic and aprotic solvents are analyzed. The spectral regularities are explained by the Kamlet and Taft (π*, α, β) scale and the ICT mechanism. Specific hydrogen-bonding interactions between the solute and solvent are considered to explain the different spectral regularities of the dye in alcoholic and aprotic solvents.

Original languageEnglish (US)
Pages (from-to)305-310
Number of pages6
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume187
Issue number2-3
DOIs
StatePublished - Apr 15 2007

Fingerprint

Charge transfer
Coloring Agents
Dyes
dyes
charge transfer
Infrared radiation
sulfonates
regularity
Electrons
Amines
Hydrogen bonds
amines
solutes
electrons
Fluorescence
absorption spectra
fluorescence
Defects
defects
hydrogen

Keywords

  • The absorption and fluorescence spectra
  • The charge transfer mechanism
  • The heptamethine cyanine dye
  • The hydrogen bond

ASJC Scopus subject areas

  • Bioengineering
  • Physical and Theoretical Chemistry

Cite this

The charge transfer mechanism and spectral properties of a near-infrared heptamethine cyanine dye in alcoholic and aprotic solvents. / Zhou, Li Chuan; Zhao, Guang Jiu; Liu, Ji Feng; Han, Ke Li; Wu, Yun Kou; Peng, Xiao Jun; Sun, Meng Tao.

In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 187, No. 2-3, 15.04.2007, p. 305-310.

Research output: Contribution to journalArticle

Zhou, Li Chuan ; Zhao, Guang Jiu ; Liu, Ji Feng ; Han, Ke Li ; Wu, Yun Kou ; Peng, Xiao Jun ; Sun, Meng Tao. / The charge transfer mechanism and spectral properties of a near-infrared heptamethine cyanine dye in alcoholic and aprotic solvents. In: Journal of Photochemistry and Photobiology A: Chemistry. 2007 ; Vol. 187, No. 2-3. pp. 305-310.
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AU - Zhao, Guang Jiu

AU - Liu, Ji Feng

AU - Han, Ke Li

AU - Wu, Yun Kou

AU - Peng, Xiao Jun

AU - Sun, Meng Tao

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AB - The charge transfer mechanism of a synthesized near-infrared (NIR) heptamethine cyanine dye has been studied with 3D real space analysis method. A new phenomenon about the intramolecular charge transfer (ICT) process is observed: the sulfonate (-SO3-) groups are mainly concerned with the ICT process. The electrons can transfer from the sulfonate (-SO3-) groups to the bridgehead amine and the electron-defect conjugated system. And the absorption and fluorescence spectra of the ICT state in alcoholic and aprotic solvents are analyzed. The spectral regularities are explained by the Kamlet and Taft (π*, α, β) scale and the ICT mechanism. Specific hydrogen-bonding interactions between the solute and solvent are considered to explain the different spectral regularities of the dye in alcoholic and aprotic solvents.

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