SiO2 colloidal effects on the twisted intramolecular charge transfer of p-N,N-dimethylaminobenzoic acid in acetonitrile

Yanghee Kim, Hyung Woo Cheon, Minjoong Yoon, Nam Woong Song, Dongho Kim

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The twisted intramolecular charge transfer (TICT) in the excited state of p-N,N-dimethylaminobenzoic acid (DMABA) has been investigated in the presence of SiO2 colloids in acetonitrile by using steady-state and time-resolved fluorescence techniques. The SiO2-dependent intensity ratio of the TICT emission to the normal emission clearly demonstrates a distinct phenomenon as a function of SiO2 concentration: an enhancement of the TICT emission occurs upon the addition of 0.3 μM SiO2 whereas a reduction occurs in the presence of excess SiO2 colloids. These results suggest that the formation of the excited TICT state is enhanced by the hydrogen bonding between the carboxylic acid of DMABA and SiO2 colloidal surface.

Original languageEnglish
Pages (from-to)673-679
Number of pages7
JournalChemical Physics Letters
Volume264
Issue number6
Publication statusPublished - 1997 Jan 24

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acetonitrile
Charge transfer
charge transfer
acids
Acids
Colloids
colloids
Carboxylic Acids
Excited states
carboxylic acids
Hydrogen bonds
Fluorescence
fluorescence
augmentation
hydrogen
excitation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Kim, Yanghee ; Cheon, Hyung Woo ; Yoon, Minjoong ; Song, Nam Woong ; Kim, Dongho. / SiO2 colloidal effects on the twisted intramolecular charge transfer of p-N,N-dimethylaminobenzoic acid in acetonitrile. In: Chemical Physics Letters. 1997 ; Vol. 264, No. 6. pp. 673-679.
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abstract = "The twisted intramolecular charge transfer (TICT) in the excited state of p-N,N-dimethylaminobenzoic acid (DMABA) has been investigated in the presence of SiO2 colloids in acetonitrile by using steady-state and time-resolved fluorescence techniques. The SiO2-dependent intensity ratio of the TICT emission to the normal emission clearly demonstrates a distinct phenomenon as a function of SiO2 concentration: an enhancement of the TICT emission occurs upon the addition of 0.3 μM SiO2 whereas a reduction occurs in the presence of excess SiO2 colloids. These results suggest that the formation of the excited TICT state is enhanced by the hydrogen bonding between the carboxylic acid of DMABA and SiO2 colloidal surface.",
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SiO2 colloidal effects on the twisted intramolecular charge transfer of p-N,N-dimethylaminobenzoic acid in acetonitrile. / Kim, Yanghee; Cheon, Hyung Woo; Yoon, Minjoong; Song, Nam Woong; Kim, Dongho.

In: Chemical Physics Letters, Vol. 264, No. 6, 24.01.1997, p. 673-679.

Research output: Contribution to journalArticle

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T1 - SiO2 colloidal effects on the twisted intramolecular charge transfer of p-N,N-dimethylaminobenzoic acid in acetonitrile

AU - Kim, Yanghee

AU - Cheon, Hyung Woo

AU - Yoon, Minjoong

AU - Song, Nam Woong

AU - Kim, Dongho

PY - 1997/1/24

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AB - The twisted intramolecular charge transfer (TICT) in the excited state of p-N,N-dimethylaminobenzoic acid (DMABA) has been investigated in the presence of SiO2 colloids in acetonitrile by using steady-state and time-resolved fluorescence techniques. The SiO2-dependent intensity ratio of the TICT emission to the normal emission clearly demonstrates a distinct phenomenon as a function of SiO2 concentration: an enhancement of the TICT emission occurs upon the addition of 0.3 μM SiO2 whereas a reduction occurs in the presence of excess SiO2 colloids. These results suggest that the formation of the excited TICT state is enhanced by the hydrogen bonding between the carboxylic acid of DMABA and SiO2 colloidal surface.

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