Resonance raman spectra of würster's cation dimers: p-phenylenediamine and 2,3,5,6-tetramethyl-p-phenylenediamine |
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| Authors: | K. Yokoyama S. Maeda |
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| Affiliation: | Research Laboratory of Resources Utilization, Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan |
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| Abstract: | Resonance Raman spectra have been observed for the dimers of p-phenylenediamine cation (PPD+) and of 2,3,5,6-tetramethyl-p-phenylenediamine cation (TMPD+). When the exciting light frequency approached the absorption bands characteristic of the dimers, new polarized Raman lines appeared at 161 cm?1 for (PPD+)2 and at 117 cm?1 for (TMPD+)2 with a striking resonance enhancement. The resonant behaviour as well as the frequency values indicate that they are reasonably assigned to the interradical stretching vibrations of the parallel D2h dimer molecules. |
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