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

doi:10.1016/s0009-2614(96)01388-7

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

30 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 language	English
Pages (from-to)	673-679
Number of pages	7
Journal	Chemical Physics Letters
Volume	264
Issue number	6
DOIs	https://doi.org/10.1016/s0009-2614(96)01388-7
Publication status	Published - 1997 Jan 24

Bibliographical note

Funding Information:
This work has been financially supported by the Korean Science and Engineering Foundation through project #94-0501-05-01-3 and the Center for Molecular Catalysis (MY) and the Center for Molecular Science (DK).

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)
Physical and Theoretical Chemistry

Access to Document

10.1016/s0009-2614(96)01388-7

Cite this

@article{40ecb7ce5faf4ce0a2709b42925dfd14,

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

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.",

author = "Yanghee Kim and Cheon, {Hyung Woo} and Minjoong Yoon and Song, {Nam Woong} and Dongho Kim",

note = "Funding Information: This work has been financially supported by the Korean Science and Engineering Foundation through project #94-0501-05-01-3 and the Center for Molecular Catalysis (MY) and the Center for Molecular Science (DK).",

year = "1997",

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journal = "Chemical Physics Letters",

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TY - JOUR

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

N1 - Funding Information: This work has been financially supported by the Korean Science and Engineering Foundation through project #94-0501-05-01-3 and the Center for Molecular Catalysis (MY) and the Center for Molecular Science (DK).

PY - 1997/1/24

Y1 - 1997/1/24

N2 - 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.

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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