Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published November 1975 | public
Journal Article

Optical and magnetic resonance properties of the triplet state of biphenyl-h_(10) in biphenyl-d_(10) and 4.2 K neutron diffraction of biphenyl-d_(10)


The phosphorescence spectrum of 2% proto in deuterobiphenyl does not exhibit the splittings that were seen previously in the fluorescence spectra [R.M. Hochstrasser, R.D. McAlpine and J.D. Whiteman, J. Chem. Phys. 58 (1973) 5078]. The zerofield magnetic resonance (optically detected) showed a structure that is most likely not due to hyperfine effects: Two or three transitions were observed in the |D + E| and |D - E| regions. In the |D + E| region the largest splitting is 4.2 ± 0.3 MHz while the splitting between the two strongest peaks is 2.0 ± 0.3 MHz. A neutron diffraction study of a C_(12)D_(10) crystalline powder at 4.2 K could be indexed on the basis of cell paramters a = 7.760, b = 5.544, c = 0.42 (Å), β = 93.6° and space group P2_1/a. It is suggested that this structure is disordered, thereby accounting for the optical, Raman and magnetic resonance experimental results, but the exact nature of the disorder has not been determined.

Additional Information

© 1975 Elsevier B.V. Received 13 June 1975. This research was supported by an N.I.H. grant GM12592 and in part by the LRSM at the University of Pennsylvania. We thank Professors R. Kopelman, P.N. Prasad and Dr. Friedman (University of Michigan) for providing us with an advance copy of their results on the phosphorescence of biphenyl in mixed crystals. R.M.H. wishes to express his gratitude to Professor H.J. Kahane and Dr. H.P. Trommsdorff (Universite de Grenoble) for making possible part of this research.

Additional details

August 19, 2023
October 20, 2023