Time-resolved study of the triplet state of 4-dimethylaminobenzonitrile (DMABN)

C. Ma; Wai Ming Kwok; P. Matousek; A. W. Parker; D. Phillips; W. T. Toner; M. Towrie

doi:10.1021/jp004497a

Time-resolved study of the triplet state of 4-dimethylaminobenzonitrile (DMABN)

C. Ma, Wai Ming Kwok, P. Matousek, A. W. Parker, D. Phillips, W. T. Toner, M. Towrie

Research output: Journal article publication › Journal article › Academic research › peer-review

33 Citations (Scopus)

Abstract

Nanosecond time-resolved resonance Raman spectra of the triplet states of DMABN, DMABN-d6, and DMABN-N15 have been obtained over the frequency range from 700 to 2300 cm-1. Isotopic shifts identify modes associated with the dimethylaniline subgroup. There is no significant difference between spectra recorded in polar and nonpolar solvents implying that the lowest triplet state (3T1) state has only one form. Our results characterize it as planar or near planar in structure, with a high negative charge localization on the cyano group and a substantial loosening of the ring skeleton with conjugation extending to the amino group. Nonradiative deactivation of the singlet intramolecular charge transfer state (1ICT) through intersystem crossing is discussed in relation to the transient absorption spectra.

Original language	English
Pages (from-to)	4648-4652
Number of pages	5
Journal	Journal of Physical Chemistry A
Volume	105
Issue number	19
DOIs	https://doi.org/10.1021/jp004497a
Publication status	Published - 17 May 2001
Externally published	Yes

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Physical and Theoretical Chemistry

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title = "Time-resolved study of the triplet state of 4-dimethylaminobenzonitrile (DMABN)",

abstract = "Nanosecond time-resolved resonance Raman spectra of the triplet states of DMABN, DMABN-d6, and DMABN-N15 have been obtained over the frequency range from 700 to 2300 cm-1. Isotopic shifts identify modes associated with the dimethylaniline subgroup. There is no significant difference between spectra recorded in polar and nonpolar solvents implying that the lowest triplet state (3T1) state has only one form. Our results characterize it as planar or near planar in structure, with a high negative charge localization on the cyano group and a substantial loosening of the ring skeleton with conjugation extending to the amino group. Nonradiative deactivation of the singlet intramolecular charge transfer state (1ICT) through intersystem crossing is discussed in relation to the transient absorption spectra.",

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T1 - Time-resolved study of the triplet state of 4-dimethylaminobenzonitrile (DMABN)

AU - Ma, C.

AU - Kwok, Wai Ming

AU - Matousek, P.

AU - Parker, A. W.

AU - Phillips, D.

AU - Toner, W. T.

AU - Towrie, M.

PY - 2001/5/17

Y1 - 2001/5/17

N2 - Nanosecond time-resolved resonance Raman spectra of the triplet states of DMABN, DMABN-d6, and DMABN-N15 have been obtained over the frequency range from 700 to 2300 cm-1. Isotopic shifts identify modes associated with the dimethylaniline subgroup. There is no significant difference between spectra recorded in polar and nonpolar solvents implying that the lowest triplet state (3T1) state has only one form. Our results characterize it as planar or near planar in structure, with a high negative charge localization on the cyano group and a substantial loosening of the ring skeleton with conjugation extending to the amino group. Nonradiative deactivation of the singlet intramolecular charge transfer state (1ICT) through intersystem crossing is discussed in relation to the transient absorption spectra.

AB - Nanosecond time-resolved resonance Raman spectra of the triplet states of DMABN, DMABN-d6, and DMABN-N15 have been obtained over the frequency range from 700 to 2300 cm-1. Isotopic shifts identify modes associated with the dimethylaniline subgroup. There is no significant difference between spectra recorded in polar and nonpolar solvents implying that the lowest triplet state (3T1) state has only one form. Our results characterize it as planar or near planar in structure, with a high negative charge localization on the cyano group and a substantial loosening of the ring skeleton with conjugation extending to the amino group. Nonradiative deactivation of the singlet intramolecular charge transfer state (1ICT) through intersystem crossing is discussed in relation to the transient absorption spectra.

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U2 - 10.1021/jp004497a

DO - 10.1021/jp004497a

M3 - Journal article

SN - 1089-5639

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JO - Journal of Physical Chemistry A

JF - Journal of Physical Chemistry A

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Time-resolved study of the triplet state of 4-dimethylaminobenzonitrile (DMABN)

Abstract

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