Stable radical pairs under the photolysis of 2,6-di-t-butyl quinone diazide in the single crystals of sterically hindered phenols: New type of double-spin probes

✍ Scribed by G.G. Lazarev; V.L. Kuskov; Ya.S. Lebedev

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 437 KB
• Volume: 170
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(90)87095-9

✦ Synopsis

Intermediate radical products, which are formed when monocrystals of sterically hindered phenols containing lo-' M Z&k&tbutyl quinone diazide are photolysed, have been studied employing EPR. We have identified the formation of carbenes and several types of radical pairs It is found that, with a rise in temperature, a red-shift is observed for the long-wave boundary involving the formation of radical pairs. The high stability of radical pairs made it possible to measure the thermal coefficients for the linear expansion of the monocrystals. Two types of asymmetric relaxation have been identified in the EPR spectra of radical pairs.