The single crystal absorption spectra of p-benzoquinonc and toluquinone have been observed at 4.2OK for three perpendicular directions of polarization. The electronic otQins of the two n-n\* transitions are located; their separation amounts to 255 cm-\* inp-benzoquinone and 560 cm-l in toluquinone.
Polarization of the triplet-singlet-nπ*-luminescence of p-benzoquinone and p-toluquinone
✍ Scribed by W. Herre; P. Weis
- Publisher
- Elsevier Science
- Year
- 1970
- Tongue
- English
- Weight
- 220 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The spectra of phosphorescence and of the degree of anisotropy of p-benzoquinone and of p-toluquinone have been investigated iu elassv solutions at -180°C. The phosphorescence of these compounds is assigned to a symmetry fokidden T' (nn*j -S-transition.
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The singlet-triplet absorption spectrum of p-Benzoquinone single crystals at 200K and 4.2oK as well as the Zeeman splitting of some of its bands is reported and discussed. The pure electronic transition is shown to be located at 18619.5 cm-1 with 9Au symmetry in the excited state. The singlet-triple
The results of polarized Stark effect absorption esperimcnts on the lower triplet states ofp-benzoquinone (PBQ)-h4 and -dq in single crystals at 1.8"K are reported. These measurements give strong support for the assignment of the lowest triplet state as triplet 3B transition at 18602.8 cm-' ,g (nn\*
Optically detected magnetic resonance (ODMR) techniques are used to determine the orbital asQnment of the phosphorescent triplet state of p-benzoquinone in the condensed phase. The principal spin-orbit coupl% routes are discussed in terms of the observed spin-vibronic activity.