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Investigations on spectra and orientation of dipole moments of uracil and thymine by electrochromism

✍ Scribed by K. Seibold; H. Labhart

Publisher
Wiley (John Wiley & Sons)
Year
1971
Tongue
English
Weight
354 KB
Volume
10
Category
Article
ISSN
0006-3525

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✦ Synopsis

Investigations on Spectra and Orientation of Dipole Moments of Uracil and Thymine by Electrochromism I<. SEIBOLD and H. LABHART, Phllsikalisch-chenzisches Institut der I'nii1er*silal Zurich, Zurich, Switxer~laizd Synopsis ? .

1 he direction of llie grornid sttile dipole nioinelit with respect to h e trslisitioii i i i onient t o the lowesl excited singlet stale as wel1:ts thedipole tnoinent in this excited stale could be determined from the influence of an electric field on the light absorption of uracil :ind thymine in solution. By making use of results on the orientation of the tmnsition moment in the molecular framework, the orientation of the ground-and excited-state dipole moments can also be fixed and compared with theoretical predictions. The agreement is fair. The measurements show that in both compounds a weak band is hiddtm under the longest-wavelength absorption band.

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## Abstract 350 MHz ^1^H NMR spectra and dipole moments showed that in the preferred conformation of 8,9‐epoxy‐6,7‐dihydro‐5__H__‐benzocyclohepten‐5‐one and its 1,4‐dimethoxy derivative the oxirane ring takes a pseudo‐axial position.