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Fluorescence excitation and fluorescence spectra of jet-cooled phenanthridine and 7,8-benzoquinoline

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Title: Fluorescence excitation and fluorescence spectra of jet-cooled phenanthridine and 7,8-benzoquinoline
Authors: Prochorow, J.1 proch@ifpan.edu.pl, Deperasińska, I.1, Stepanenko, Y.2
Source: Chemical Physics Letters. Nov2004, Vol. 399 Issue 1-3, p239-246. 8p.
Subjects: Spectrum analysis, Fluorescence, Radioactivity, Cooling
Abstract: Abstract: The fluorescence excitation spectra and single vibronic level fluorescence spectra of jet-cooled phenanthridine and 7,8-benzoquinoline are reported. These spectra are entirely of molecular origin, as revealed by their dependence on the conditions of supersonic expansion (partial pressure of substances, pressure of He carrier gas). Such conclusion is in general agreement with symmetry-based arguments – contrary to the case of acridine (symmetric monoazaanthracene), the capability of these monoazaphenanthrenes to the formation of homodimers (under jet-cooling connditions) is virtually nil. A preliminary analysis of vibronic features of the first excited singlet state of both monoazaphenanthrenes, based on the comparison with the vibrational assignments for the jet-cooled phenanthrene, and with ground-state IR spectra of these molecules recorded in low-temperature argon matrices are showing that vibrational ground state frequencies are changing upon excitation. This is also confirmed by the vibrational structure of the single vibronic level fluorescence spectra. [Copyright &y& Elsevier]
Copyright of Chemical Physics Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 15426765
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  Data: Fluorescence excitation and fluorescence spectra of jet-cooled phenanthridine and 7,8-benzoquinoline
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  Data: <searchLink fieldCode="AR" term="%22Prochorow%2C+J%2E%22">Prochorow, J.</searchLink><relatesTo>1</relatesTo><i> proch@ifpan.edu.pl</i><br /><searchLink fieldCode="AR" term="%22Deperasińska%2C+I%2E%22">Deperasińska, I.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Stepanenko%2C+Y%2E%22">Stepanenko, Y.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Chemical+Physics+Letters%22">Chemical Physics Letters</searchLink>. Nov2004, Vol. 399 Issue 1-3, p239-246. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescence%22">Fluorescence</searchLink><br /><searchLink fieldCode="DE" term="%22Radioactivity%22">Radioactivity</searchLink><br /><searchLink fieldCode="DE" term="%22Cooling%22">Cooling</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: The fluorescence excitation spectra and single vibronic level fluorescence spectra of jet-cooled phenanthridine and 7,8-benzoquinoline are reported. These spectra are entirely of molecular origin, as revealed by their dependence on the conditions of supersonic expansion (partial pressure of substances, pressure of He carrier gas). Such conclusion is in general agreement with symmetry-based arguments – contrary to the case of acridine (symmetric monoazaanthracene), the capability of these monoazaphenanthrenes to the formation of homodimers (under jet-cooling connditions) is virtually nil. A preliminary analysis of vibronic features of the first excited singlet state of both monoazaphenanthrenes, based on the comparison with the vibrational assignments for the jet-cooled phenanthrene, and with ground-state IR spectra of these molecules recorded in low-temperature argon matrices are showing that vibrational ground state frequencies are changing upon excitation. This is also confirmed by the vibrational structure of the single vibronic level fluorescence spectra. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Chemical Physics Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.cplett.2004.10.010
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 239
    Subjects:
      – SubjectFull: Spectrum analysis
        Type: general
      – SubjectFull: Fluorescence
        Type: general
      – SubjectFull: Radioactivity
        Type: general
      – SubjectFull: Cooling
        Type: general
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      – TitleFull: Fluorescence excitation and fluorescence spectra of jet-cooled phenanthridine and 7,8-benzoquinoline
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              Text: Nov2004
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