Abstract
In an EPR investigation of delocalized and localized excited triplet states of the charge-transfer complexes in diphenylacetylene—tetracyanobenzene single crystals, the spectrum of the triplet trap is observed even at room temperature and shows the presence of hyperfine structure that has been attributed to the nitrogen nuclei of the tetracyanobenzene molecule. Triplet exciton signals arise at temperatures lower than 100 K. The ZFS principal axes of the trap coincide with those of the two translationally inequivalent triplet sites of the lattice that generate the diffusional triplet exciton. Both localized and delocalized triplet states display strong optical electron spin polarization. The variation of the ZFS principal values upon formation of the charge-transfer complexes is discussed.
Published Version
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