The Spectroscopic Studies on the Aggregation Behavior of Cyanine Dyes

Hyungsik Min, Jeunghee Park, Jongwan Yu, Dongho Kim

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Aggregations of 1,1′-diethyl-2,2′-carbocyanine iodide (DCI) and 1,1′-diethyl-2,2′-dicarbocyanine iodide (DDI) in aqueous solution have been investigated by the steady-state absorption spectroscopy. The equilibrium constants for dimerization of DCI and DDI are found to be (9.8±0.5) × 105 and (1.6±0.5)× 105 M-1, respectively, at 293 K. The enthalpy changes for the dimerization of DCI and DDI are -6.7±0.7 and - 7.7±0.8 kcal/mol, respectively. The results show that the dispersion force plays an important role in the aggregation of DCI and DDI in aqueous solution. The absorption bandwidth of DCI/ethanol system has been measured as a function of temperature, providing the evidence for no strong interaction between DCI and solvent molecules. The participation of hydrophobia force in driving the aggregation is suggested. For the first time, DCI in aqueous solution is found to form a new aggregate which has both J- and H- bands.

Original languageEnglish
Pages (from-to)650-654
Number of pages5
JournalBulletin of the Korean Chemical Society
Volume19
Issue number6
Publication statusPublished - 1998 Dec 1

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Iodides
Carbocyanines
Coloring Agents
Agglomeration
Dimerization
Equilibrium constants
Absorption spectroscopy
Enthalpy
Ethanol
Bandwidth
Molecules

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Min, Hyungsik ; Park, Jeunghee ; Yu, Jongwan ; Kim, Dongho. / The Spectroscopic Studies on the Aggregation Behavior of Cyanine Dyes. In: Bulletin of the Korean Chemical Society. 1998 ; Vol. 19, No. 6. pp. 650-654.
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The Spectroscopic Studies on the Aggregation Behavior of Cyanine Dyes. / Min, Hyungsik; Park, Jeunghee; Yu, Jongwan; Kim, Dongho.

In: Bulletin of the Korean Chemical Society, Vol. 19, No. 6, 01.12.1998, p. 650-654.

Research output: Contribution to journalArticle

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