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It has been established that in the studied solutions under irradiation, geometric photoisomerization occurs: the <jats:italic>trans<\/jats:italic>\u2010isomer transforms into the <jats:italic>cis<\/jats:italic>\u2010isomer and then cyclization occurs. DFT modeling of the listed processes, states and UV absorption spectra of the sample in an acetonitrile solution was performed.<\/jats:p>","DOI":"10.1111\/php.13785","type":"journal-article","created":{"date-parts":[[2023,1,27]],"date-time":"2023-01-27T03:04:52Z","timestamp":1674788692000},"page":"1378-1383","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Photoisomerization of 1,<scp>2\u2010Di<\/scp>(4\u2010pyridyl)ethylene According to <scp>NMR<\/scp> and <scp>UV<\/scp> Spectroscopy Data and Density Functional Modeling"],"prefix":"10.1111","volume":"99","author":[{"given":"Amina F.","family":"Shaidullina","sequence":"first","affiliation":[{"name":"Kazan Federal University  Kazan Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alsu R.","family":"Sharipova","sequence":"additional","affiliation":[{"name":"Zavoisky Physical\u2010Technical Institute, FRC Kazan Scientific Center of RAS  Kazan 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