{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,5]],"date-time":"2026-04-05T17:00:22Z","timestamp":1775408422442,"version":"3.50.1"},"reference-count":25,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2013,10,19]],"date-time":"2013-10-19T00:00:00Z","timestamp":1382140800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Photochem &amp; Photobiology"],"published-print":{"date-parts":[[2014,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The kinetics of transients formed under photoexcitation of benzophenone (B) dissolved in three different polymers was studied by ns laser flash photolysis. These polymers were the soft rubbers poly (ethylene\u2010<jats:italic>co<\/jats:italic>\u2010butylene) (EB), polystyrene <jats:italic>block<\/jats:italic>\u2010poly(ethylene\u2010<jats:italic>ran<\/jats:italic>\u2010butylene)\u2010<jats:italic>block<\/jats:italic>\u2010polystyrene (SEBS) and hard polystyrene (PS). We monitored the decay kinetics of triplet state <jats:sup>3<\/jats:sup>B<jats:sup>*<\/jats:sup>and of ketyl radicals BH<jats:sup>\u25cf<\/jats:sup>. We observed exponential decay of <jats:sup>3<\/jats:sup>B<jats:sup>*<\/jats:sup> and two\u2010stage decay kinetics of BH<jats:sup>\u25cf<\/jats:sup>in EB. The first stage is a fast cage recombination of a radical pair (BH<jats:sup>\u25cf<\/jats:sup>, radical of polymer R<jats:sup>\u25cf<\/jats:sup>). The second slow stage of BH<jats:sup>\u25cf<\/jats:sup> decay follows the second\u2010order law with a relatively high rate constant, which corresponds to recombination of BH<jats:sup>\u25cf<\/jats:sup> in a homogeneous liquid with a viscosity of only ~0.1\u00a0P (about five times of 2\u2010propanol viscosity). Application of a magnetic field (MF) of 0.2\u00a0T leads to deceleration of both stages of BH<jats:sup>\u25cf<\/jats:sup> decay in EB by approximately 20%. Decay kinetics of both transients were observed in SEBS. There was no MF effect on BH<jats:sup>\u25cf<\/jats:sup> decay in SEBS. We only observed <jats:sup>3<\/jats:sup>B<jats:sup>*<\/jats:sup> in PS. Decay kinetics of <jats:sup>3<\/jats:sup>B<jats:sup>*<\/jats:sup> in this case were described as polychromatic dispersive first\u2010order kinetics. We discuss the effects of polymer structure on transient kinetics and the MF effect.<\/jats:p>","DOI":"10.1111\/php.12170","type":"journal-article","created":{"date-parts":[[2013,10,8]],"date-time":"2013-10-08T13:33:56Z","timestamp":1381239236000},"page":"369-373","source":"Crossref","is-referenced-by-count":10,"title":["Decay Kinetics of Benzophenone Triplets and Corresponding Free Radicals in Soft and Rigid Polymers Studied by Laser Flash Photolysis"],"prefix":"10.1111","volume":"90","author":[{"given":"Peter P.","family":"Levin","sequence":"first","affiliation":[{"name":"Emanuel Institute of Biochemical Physics Russian Academy of Sciences Moscow Russia"},{"name":"Semenov Institute of Chemical Physics Russian Academy of Sciences Moscow Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexei F.","family":"Efremkin","sequence":"additional","affiliation":[{"name":"Semenov Institute of Chemical Physics Russian Academy of Sciences Moscow Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Natalie B.","family":"Sultimova","sequence":"additional","affiliation":[{"name":"Emanuel Institute of Biochemical Physics Russian Academy of Sciences Moscow Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Valery V.","family":"Kasparov","sequence":"additional","affiliation":[{"name":"Emanuel Institute of Biochemical Physics Russian Academy of Sciences Moscow Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Igor V.","family":"Khudyakov","sequence":"additional","affiliation":[{"name":"Department of Chemistry Columbia University New York NY"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2013,10,19]]},"reference":[{"key":"e_1_2_5_2_1","volume-title":"Modern Molecular Photochemistry of Organic Molecules","author":"Turro N. 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