Abstract
An investigation of the low temperature phosphorescence and the triplet state zero-field ODMR spectra of 2,2′-biquinoline is presented. In order to characterize the normal modes of the molecule the Raman spectrum of the neat crystal at room temperature has been studied and the observed molecular vibrations assigned. The phosphorescence at 1.9 K in mixed single crystal (benzoic acid) and Shpol’skii hosts show a highly structured vibronic spectrum. The spectra reveal that to a good approximation the molecule retains its trans-planar geometry in the triplet state in these matrices at low temperatures. The zero-field transitions of the molecule in its lowest triplet state were investigated by ODMR spectroscopy on the various optically resolvable sites observed in the phosphorescence. Each of the ODMR transitions exhibit two resonances both of which have well-resolved 14N hyperfine and quadrupolar satellites. On the basis of a hyperfine analysis and the frequencies of the resonances the existence of two close lying triplet states (unresolved in the phosphorescence) was determined. One of these is a localized quinolinelike 3ππ* state while the other possesses a delocalized character.
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