Triplet state properties of pyridinium

✍ Scribed by Ann G. Motten; Alvin L. Kwiram

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 390 KB
• Volume: 45
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(77)80256-x

✦ Synopsis

Pyridinium phosphorescence originates at 334 nm and has a Iifetime of 3.5 s; rhe quantum yield is roughly 0.04. The ODMR spectrum gives a zero-fie!d splitting of IDI = 0.134 cm -l, \El = 0.030 cm-'. Implications for the lowest triplet state of pyridine are discussed. Pyridine, the prototypical azine, is apparently nonluminescent. Pyridine triplet states have been observed in absorption by Evans [i] * and Japar and Ramsay * A preliminary accaunt of this work was presented at the First Chemical Congress of the North American Continent, Mexico City, Mexico, 1975. Abstract PHSC 106, of the American Chemical Society. * Supported in part by a NDEA Title IV Predoctoral Fcllowship. * Experiment carried out in the liquid phase under 100 atm 02 perturbation. ** Experiment carried out in the gas phase with a 30 m pathlength. * An electron excitation spectrum is reported by Pisanias et al. [4]. They claimed that 3nn* states were observed be-Iow the 3.8 eV 3nn* states reported in ref. [3]. However, more recent measurements by van Veen and Plantenga [5] dispute these results.