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Photochemical hole burning of ionic porphins and the deuterated analogues

✍ Scribed by Kazuaki Sakoda; Masayuki Maeda

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
408 KB
Volume
217
Category
Article
ISSN
0009-2614

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✦ Synopsis

The quantum yields of photochemical hole burning (PHB) of three ionic porphins and their deuterated analogues doped in poly (vinylalcohol) and poly (sodium 4-styrenesulfonate) were estimated. The deuterated compounds, whose two hydrogen atoms at the nitrogen sites in the porphin ring were exchanged with deuterium atoms, were synthesized by reacting the non-deuterated compounds with heavy water. The quantum yield of the deuterated porphin was 18 to 45 times smaller than that of the nondeuterated compound. Besides, the hole area did not decrease at least up to about 60 K. These two facts definitely show that the main mechanism of PHB in this system is not a photophysical process, but the tautomerization of the porphin ring.

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