Normal and twisted intramolecular charge-transfer fluorescence of 4-dimethylaminobenzonitrile in α-cyclodextrine cavities

Khader A. Al-Hassan; Uwe K.A. Klein; A. Suwaiyan

doi:10.1016/0009-2614(93)85489-B

Normal and twisted intramolecular charge-transfer fluorescence of 4-dimethylaminobenzonitrile in α-cyclodextrine cavities

Khader A. Al-Hassan^*, Uwe K.A. Klein, A. Suwaiyan

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

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

58 Scopus citations

Abstract

Dual fluorescence of 4-dimethylaminobenzonitrile (DMABN) has been used to study the behavior of DMABN in α-cyclodextrine (α-CD). Results obtained indicate that DMABN in an aqueous α-CD solution probably exists in three different environmental conditions; polar, slightly polar and hydrophobic. DMABN surrounded by water molecules represents the most polar and least rigid environment. DMABN molecules have two different possible positions inside the α-CD cavity. The first position could arise when the dimethylamino group of the DMABN molecule is headed towards the larger rim of the α-CD cavity representing the slightly polar and slightly rigid environment. The second position could arise when the dimethylamino group of the DMABN molecule is headed towards the smaller rim of the α-CD cavity representing the least polar and most rigid environment. Therefore, it is suggested that the relative positions and contributions of the two fluorescence bands of DMABN in α-CD are determined by restricted molecular motion (controlled by the polarity and free volume of the α-CD cavity) rather than by the polarity alone.

Original language	English
Pages (from-to)	581-587
Number of pages	7
Journal	Chemical Physics Letters
Volume	212
Issue number	6
DOIs	https://doi.org/10.1016/0009-2614(93)85489-B
State	Published - 24 Sep 1993

Bibliographical note

Funding Information:
Support from the Research Institute of King Fahd University of Petroleum and Minerals (FZUPM) is gratefully acknowledged. Special thanks are due to Professor T. Azumi from Tohoku University for donating a-CD. We would also like to thank Mr. N. Baig, Mr. MS. Rana, and Mr. J. Mastromarino for their contributions and help in this work.

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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@article{c138ebed6742477886f0b90209ec8ae6,

title = "Normal and twisted intramolecular charge-transfer fluorescence of 4-dimethylaminobenzonitrile in α-cyclodextrine cavities",

abstract = "Dual fluorescence of 4-dimethylaminobenzonitrile (DMABN) has been used to study the behavior of DMABN in α-cyclodextrine (α-CD). Results obtained indicate that DMABN in an aqueous α-CD solution probably exists in three different environmental conditions; polar, slightly polar and hydrophobic. DMABN surrounded by water molecules represents the most polar and least rigid environment. DMABN molecules have two different possible positions inside the α-CD cavity. The first position could arise when the dimethylamino group of the DMABN molecule is headed towards the larger rim of the α-CD cavity representing the slightly polar and slightly rigid environment. The second position could arise when the dimethylamino group of the DMABN molecule is headed towards the smaller rim of the α-CD cavity representing the least polar and most rigid environment. Therefore, it is suggested that the relative positions and contributions of the two fluorescence bands of DMABN in α-CD are determined by restricted molecular motion (controlled by the polarity and free volume of the α-CD cavity) rather than by the polarity alone.",

author = "Al-Hassan, \{Khader A.\} and Klein, \{Uwe K.A.\} and A. Suwaiyan",

note = "Funding Information: Support from the Research Institute of King Fahd University of Petroleum and Minerals (FZUPM) is gratefully acknowledged. Special thanks are due to Professor T. Azumi from Tohoku University for donating a-CD. We would also like to thank Mr. N. Baig, Mr. MS. Rana, and Mr. J. Mastromarino for their contributions and help in this work.",

year = "1993",

month = sep,

day = "24",

doi = "10.1016/0009-2614(93)85489-B",

language = "English",

volume = "212",

pages = "581--587",

journal = "Chemical Physics Letters",

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T1 - Normal and twisted intramolecular charge-transfer fluorescence of 4-dimethylaminobenzonitrile in α-cyclodextrine cavities

AU - Al-Hassan, Khader A.

AU - Klein, Uwe K.A.

AU - Suwaiyan, A.

N1 - Funding Information: Support from the Research Institute of King Fahd University of Petroleum and Minerals (FZUPM) is gratefully acknowledged. Special thanks are due to Professor T. Azumi from Tohoku University for donating a-CD. We would also like to thank Mr. N. Baig, Mr. MS. Rana, and Mr. J. Mastromarino for their contributions and help in this work.

PY - 1993/9/24

Y1 - 1993/9/24

N2 - Dual fluorescence of 4-dimethylaminobenzonitrile (DMABN) has been used to study the behavior of DMABN in α-cyclodextrine (α-CD). Results obtained indicate that DMABN in an aqueous α-CD solution probably exists in three different environmental conditions; polar, slightly polar and hydrophobic. DMABN surrounded by water molecules represents the most polar and least rigid environment. DMABN molecules have two different possible positions inside the α-CD cavity. The first position could arise when the dimethylamino group of the DMABN molecule is headed towards the larger rim of the α-CD cavity representing the slightly polar and slightly rigid environment. The second position could arise when the dimethylamino group of the DMABN molecule is headed towards the smaller rim of the α-CD cavity representing the least polar and most rigid environment. Therefore, it is suggested that the relative positions and contributions of the two fluorescence bands of DMABN in α-CD are determined by restricted molecular motion (controlled by the polarity and free volume of the α-CD cavity) rather than by the polarity alone.

AB - Dual fluorescence of 4-dimethylaminobenzonitrile (DMABN) has been used to study the behavior of DMABN in α-cyclodextrine (α-CD). Results obtained indicate that DMABN in an aqueous α-CD solution probably exists in three different environmental conditions; polar, slightly polar and hydrophobic. DMABN surrounded by water molecules represents the most polar and least rigid environment. DMABN molecules have two different possible positions inside the α-CD cavity. The first position could arise when the dimethylamino group of the DMABN molecule is headed towards the larger rim of the α-CD cavity representing the slightly polar and slightly rigid environment. The second position could arise when the dimethylamino group of the DMABN molecule is headed towards the smaller rim of the α-CD cavity representing the least polar and most rigid environment. Therefore, it is suggested that the relative positions and contributions of the two fluorescence bands of DMABN in α-CD are determined by restricted molecular motion (controlled by the polarity and free volume of the α-CD cavity) rather than by the polarity alone.

UR - https://www.scopus.com/pages/publications/33044499377

U2 - 10.1016/0009-2614(93)85489-B

DO - 10.1016/0009-2614(93)85489-B

M3 - Article

AN - SCOPUS:33044499377

SN - 0009-2614

VL - 212

SP - 581

EP - 587

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 6

ER -

Normal and twisted intramolecular charge-transfer fluorescence of 4-dimethylaminobenzonitrile in α-cyclodextrine cavities

Abstract

Bibliographical note

ASJC Scopus subject areas

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