Photoluminescence of ortho-bromobenzophenone
Phosphorescence spectra of crystalline ortho-bromobenzophenone (2-bromobenzophenone, 2BrBP) were measured from 1.6 K to room temperature. A cardinal emission mechanism crossover occurs within this temperature range. At low temperature the phosphorescence spectrum is a superposition of two similar...
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2006
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| Zitieren: | Photoluminescence of ortho-bromobenzophenone / A.A. Avdeenko, O.S. Pyshkin, V.V. Eremenko, M.A. Strzhemechny, L.M. Buravtseva, R.V. Romashkin // Физика низких температур. — 2006. — Т. 32, № 11. — С. 1355–1362. — Бібліогр.: 36 назв. — англ. |
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Avdeenko, A.A. Pyshkin, O.S. Eremenko, V.V. Strzhemechny, M.A. Buravtseva, L.M. Romashkin, R.V. 2017-06-13T08:54:29Z 2017-06-13T08:54:29Z 2006 Photoluminescence of ortho-bromobenzophenone / A.A. Avdeenko, O.S. Pyshkin, V.V. Eremenko, M.A. Strzhemechny, L.M. Buravtseva, R.V. Romashkin // Физика низких температур. — 2006. — Т. 32, № 11. — С. 1355–1362. — Бібліогр.: 36 назв. — англ. 0132-6414 PACS: 78.55.Kz, 31.50.+w https://nasplib.isofts.kiev.ua/handle/123456789/120880 Phosphorescence spectra of crystalline ortho-bromobenzophenone (2-bromobenzophenone, 2BrBP) were measured from 1.6 K to room temperature. A cardinal emission mechanism crossover occurs within this temperature range. At low temperature the phosphorescence spectrum is a superposition of two similar sets of equidistant bands spaced by the C=O stretch frequency. We ascribe these two sets to the emission of two different conformers, one of which is metastable and do not manifest itself above approximately 70 K. Presence of two conformers is explained by the fact that the 2BrBP molecule deforms considerably upon excitation. The emission from the stable conformer survives up to approximately 140 K or even higher. At roughly 60 K and higher, another type of emission reveals itself in the shape of a two very broad partly overlapping bands, which gains in intensity with increasing temperature. Above 150 K only this two-hump feature is observed in phosphorescence spectra. Additional phosphorescence experiments were carried out to elucidate the nature of this spectrum, including phosphorescence measurements of 2BrBP in ethanol solutions as well as time-resolved and varying-excitation-intensity measurements from crystals. Based on results of all the experiments reported here and on our own single-crystal x-ray structure data we conclude that the above two-band spectrum recorded near room temperature is due to the emission of single-photon bimolecular triplet excimer formed by the carbonyl groups of two neighbor 2-bromobenzophenone molecules. It is got the first time that a bimolecular excimer has been observed and reliably identified in a benzophenone derivative solid. The authors are sincerely grateful to A.V. Luzanov for his calculations of the excited triplet state of the ortho-bromobenzophenone molecule. The authors also thank V.N. Baumer for helpful discussions and P.V. Zinoviev for constructive criticism of the manuscript. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Molecular Solids Photoluminescence of ortho-bromobenzophenone Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Photoluminescence of ortho-bromobenzophenone |
| spellingShingle |
Photoluminescence of ortho-bromobenzophenone Avdeenko, A.A. Pyshkin, O.S. Eremenko, V.V. Strzhemechny, M.A. Buravtseva, L.M. Romashkin, R.V. Molecular Solids |
| title_short |
Photoluminescence of ortho-bromobenzophenone |
| title_full |
Photoluminescence of ortho-bromobenzophenone |
| title_fullStr |
Photoluminescence of ortho-bromobenzophenone |
| title_full_unstemmed |
Photoluminescence of ortho-bromobenzophenone |
| title_sort |
photoluminescence of ortho-bromobenzophenone |
| author |
Avdeenko, A.A. Pyshkin, O.S. Eremenko, V.V. Strzhemechny, M.A. Buravtseva, L.M. Romashkin, R.V. |
| author_facet |
Avdeenko, A.A. Pyshkin, O.S. Eremenko, V.V. Strzhemechny, M.A. Buravtseva, L.M. Romashkin, R.V. |
| topic |
Molecular Solids |
| topic_facet |
Molecular Solids |
| publishDate |
2006 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
Phosphorescence spectra of crystalline ortho-bromobenzophenone (2-bromobenzophenone,
2BrBP) were measured from 1.6 K to room temperature. A cardinal emission mechanism crossover
occurs within this temperature range. At low temperature the phosphorescence spectrum is a
superposition of two similar sets of equidistant bands spaced by the C=O stretch frequency. We
ascribe these two sets to the emission of two different conformers, one of which is metastable and
do not manifest itself above approximately 70 K. Presence of two conformers is explained by the
fact that the 2BrBP molecule deforms considerably upon excitation. The emission from the stable
conformer survives up to approximately 140 K or even higher. At roughly 60 K and higher, another
type of emission reveals itself in the shape of a two very broad partly overlapping bands, which
gains in intensity with increasing temperature. Above 150 K only this two-hump feature is
observed in phosphorescence spectra. Additional phosphorescence experiments were carried out to
elucidate the nature of this spectrum, including phosphorescence measurements of 2BrBP in
ethanol solutions as well as time-resolved and varying-excitation-intensity measurements from
crystals. Based on results of all the experiments reported here and on our own single-crystal x-ray
structure data we conclude that the above two-band spectrum recorded near room temperature is
due to the emission of single-photon bimolecular triplet excimer formed by the carbonyl groups of
two neighbor 2-bromobenzophenone molecules. It is got the first time that a bimolecular excimer
has been observed and reliably identified in a benzophenone derivative solid.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/120880 |
| citation_txt |
Photoluminescence of ortho-bromobenzophenone / A.A. Avdeenko, O.S. Pyshkin, V.V. Eremenko, M.A. Strzhemechny, L.M. Buravtseva, R.V. Romashkin // Физика низких температур. — 2006. — Т. 32, № 11. — С. 1355–1362. — Бібліогр.: 36 назв. — англ. |
| work_keys_str_mv |
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| first_indexed |
2025-12-07T16:21:06Z |
| last_indexed |
2025-12-07T16:21:06Z |
| _version_ |
1850867152562683904 |