{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T14:04:49Z","timestamp":1787925889492,"version":"build-2784847793"},"reference-count":74,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2026,1,6]],"date-time":"2026-01-06T00:00:00Z","timestamp":1767657600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,1,6]],"date-time":"2026-01-06T00:00:00Z","timestamp":1767657600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["The Chemical Record"],"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:p>Electron paramagnetic resonance (EPR) spectroscopy has long been widely utilized to investigate, characterize, and monitor highly reactive paramagnetic chemical species generated in materials upon exposure to ionizing radiation. This personal account presents EPR observations and spectral analyses of several fundamental paramagnetic species, including cations, anions, and neutral radicals, isolated using a low\u2010temperature solid matrix isolation (MI) technique combined with radiation exposure, a method in which the author has extensive experience. These findings are not only of significant interest in the field of molecular science but also demonstrate the utility of the MI technique as a laboratory\u2010based approach to exploring chemical evolution in space. Recent density functional theory analyses, which reveal a second\u2010order Jahn\u2013Teller distortion, suggest that the stability of the distorted structure of the silacyclohexane radical cation is considerably less pronounced than previously indicated by Hartree\u2013Fock\u2010based theoretical calculations. Furthermore, EPR results for the perfluorocubane radical anion, a species that has recently attracted significant attention, are also presented.<\/jats:p>","DOI":"10.1002\/tcr.202500304","type":"journal-article","created":{"date-parts":[[2026,1,6]],"date-time":"2026-01-06T09:52:15Z","timestamp":1767693135000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Matrix\u2010Isolation Electron Paramagnetic Resonance Studies of Radical Ions and Neutral Radicals Generated by Radiolysis of Organic Molecules at Cryogenic Temperatures"],"prefix":"10.1002","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-8793-7564","authenticated-orcid":false,"given":"Kenji","family":"Komaguchi","sequence":"first","affiliation":[{"name":"Applied Chemistry Program Graduate School of Advanced Science and Engineering Hiroshima University  Higashi\u2010Hiroshima Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,1,6]]},"reference":[{"key":"e_1_2_9_2_1","volume-title":"Electron Spin Resonance : Theory and Applications","author":"Atherton N. M.","year":"1973"},{"key":"e_1_2_9_3_1","volume-title":"Theory and Applications of Electron Spin Resonance","author":"Gordy W.","year":"1980"},{"key":"e_1_2_9_4_1","volume-title":"Radical Ions","author":"Kaiser E. T.","year":"1968"},{"key":"e_1_2_9_5_1","volume-title":"Chemistry and Physics of Matrix\u2010Isolated Species","author":"Andrews L.","year":"1989"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1696051"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1727096"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja00980a055"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.444070"},{"key":"e_1_2_9_10_1","first-page":"167","volume-title":"Chemistry and Physics of Matrix\u2010Isolated Species","author":"Knight L. B.","year":"1989"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp984716g"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1021\/j100495a016"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1039\/cs9841300393"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-94-011-3750-8"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja00402a066"},{"key":"e_1_2_9_16_1","first-page":"333","article-title":"ESR Studies of Radical Cations in Solid Matrices","volume":"12","author":"Shiotani M.","year":"1987","journal-title":"Magnetic Resonance Review"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.443863"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1039\/dc9847800019"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0009-2614(96)01426-1"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/0009-2614(92)80094-R"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1016\/0009-2614(92)85094-Q"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp970958p"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1039\/a905143k"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1039\/b103526f"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.1246\/bcsj.74.2319"},{"key":"e_1_2_9_26_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja00975a002"},{"key":"e_1_2_9_27_1","doi-asserted-by":"publisher","DOI":"10.1039\/dc9776300157"},{"key":"e_1_2_9_28_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1730905"},{"key":"e_1_2_9_29_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1726009"},{"key":"e_1_2_9_30_1","volume-title":"Handbook of Chemistry and Physics","author":"Lide D. R.","year":"2002"},{"key":"e_1_2_9_31_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1744740"},{"key":"e_1_2_9_32_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1696995"},{"key":"e_1_2_9_33_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1672302"},{"key":"e_1_2_9_34_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1673211"},{"key":"e_1_2_9_35_1","doi-asserted-by":"publisher","DOI":"10.1088\/0022-3719\/7\/1\/006"},{"key":"e_1_2_9_36_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.437996"},{"key":"e_1_2_9_37_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.458560"},{"key":"e_1_2_9_38_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0301-0104(97)00301-7"},{"key":"e_1_2_9_39_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.2715589"},{"key":"e_1_2_9_40_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.3122004"},{"key":"e_1_2_9_41_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp909316b"},{"key":"e_1_2_9_42_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp063723z"},{"key":"e_1_2_9_43_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1725837"},{"key":"e_1_2_9_44_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRev.151.207"},{"key":"e_1_2_9_45_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.438508"},{"key":"e_1_2_9_46_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0009-2614(97)00205-4"},{"key":"e_1_2_9_47_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1730906"},{"key":"e_1_2_9_48_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0009-2614(98)01360-8"},{"key":"e_1_2_9_49_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp970066p"},{"key":"e_1_2_9_50_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.470563"},{"key":"e_1_2_9_51_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.476714"},{"key":"e_1_2_9_52_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.479594"},{"key":"e_1_2_9_53_1","doi-asserted-by":"publisher","DOI":"10.1103\/RevModPhys.52.393"},{"key":"e_1_2_9_54_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.477821"},{"key":"e_1_2_9_55_1","doi-asserted-by":"publisher","DOI":"10.1016\/0009-2614(88)87219-1"},{"key":"e_1_2_9_56_1","doi-asserted-by":"publisher","DOI":"10.1016\/0009-2614(89)85043-2"},{"key":"e_1_2_9_57_1","doi-asserted-by":"publisher","DOI":"10.1039\/P29910000711"},{"key":"e_1_2_9_58_1","doi-asserted-by":"publisher","DOI":"10.1021\/j100085a012"},{"key":"e_1_2_9_59_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja00159a010"},{"key":"e_1_2_9_60_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.474441"},{"key":"e_1_2_9_61_1","volume-title":"Gaussian 16 Rev. C.01","author":"Frisch M. J.","year":"2016"},{"key":"e_1_2_9_62_1","first-page":"443","article-title":"Static Jahn\u2010Teller Distortions in Small Molecules: CH4\n                  +, CF4\n                  +, NH3\n                  + (Excited State) and NH3 (Excited State)\", Proceedings of the Royal Society of London Series A","volume":"269","author":"Coulson C. A.","year":"1962","journal-title":"Mathematical and Physical Sciences"},{"key":"e_1_2_9_63_1","doi-asserted-by":"publisher","DOI":"10.1080\/00268977100100121"},{"key":"e_1_2_9_64_1","doi-asserted-by":"publisher","DOI":"10.1016\/0009-2614(70)85089-8"},{"key":"e_1_2_9_65_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.460802"},{"key":"e_1_2_9_66_1","doi-asserted-by":"publisher","DOI":"10.1021\/j100196a026"},{"key":"e_1_2_9_67_1","doi-asserted-by":"publisher","DOI":"10.1021\/j100133a015"},{"key":"e_1_2_9_68_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF03162572"},{"key":"e_1_2_9_69_1","volume-title":"Gaussview, Version 6.1","author":"Dennington R.","year":"2016"},{"key":"e_1_2_9_70_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.abq0516"},{"key":"e_1_2_9_71_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.6.343"},{"key":"e_1_2_9_72_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1733156"},{"key":"e_1_2_9_73_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja00429a050"},{"key":"e_1_2_9_74_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja0505898"},{"key":"e_1_2_9_75_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp064891u"}],"container-title":["The Chemical Record"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/tcr.202500304","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.1002\/tcr.202500304","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/tcr.202500304","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T08:32:39Z","timestamp":1777365159000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/tcr.202500304"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,1,6]]},"references-count":74,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2026,4]]}},"alternative-id":["10.1002\/tcr.202500304"],"URL":"https:\/\/doi.org\/10.1002\/tcr.202500304","archive":["Portico"],"relation":{},"ISSN":["1527-8999","1528-0691"],"issn-type":[{"value":"1527-8999","type":"print"},{"value":"1528-0691","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,1,6]]},"assertion":[{"value":"2025-11-01","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2025-12-11","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-01-06","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"e202500304"}}