| Popis: |
We report on the electronic and triplet state ODMR spectroscopy of s-tetrazme, 3,6-dimethyl-, 3,6-dimethoxy- and 3,6bis(methylthio)-s-tetrazines. Zero field splitting parameters were obtained by ODMR monitoring both the delayed fluorescence and the phosphorescence m neat single crystals. The S, and T, exciton electronic origins are reported. The zero field splitting tensor is nearly axially symmetric with 1 D 1 approximately 0.4 cm- ‘. This value is found to be in good agreement with calculattons based on magnetic dipole-dipole coupling in a ‘BS, (nx”) state. The calculations predict a positive value for D with the major axis passing through the C atoms at the 3 and 6 positions. 1. In~~ue~on |
