{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,2]],"date-time":"2026-08-02T02:55:11Z","timestamp":1785639311860,"version":"3.56.0"},"reference-count":22,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2022,5,21]],"date-time":"2022-05-21T00:00:00Z","timestamp":1653091200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100006345","name":"Nicolaus Copernicus University","doi-asserted-by":"publisher","award":["WF 540\/2020"],"award-info":[{"award-number":["WF 540\/2020"]}],"id":[{"id":"10.13039\/501100006345","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>The paper presents synthesis and characterization of nine new thiazolyl-(phenyldiazenyl)-2H-chromen-2-one dyes. The impact of substituent structure in thiazole ring in the synthesized azocoumarin derivatives on electrochemical properties, photoisomerization process and photovoltaic response was examined. The dyes were electrochemically active and undergo reduction and oxidation processes. They showed low electrochemically estimated energy band gap in the range of 1.71\u20132.13 eV. Photoisomerization process of the synthesized molecules was studied in various solvents such as ethanol, chloroform and N,N-dimethylformamide (DMF) upon the UV illumination. It was found that novel azodyes showed reversible trans-cis-trans isomerization and exhibited long thermal back to the trans form, that was even 7 days in DMF. Selected azocoumarin were molecularly dispersed in polystyrene for preparation of guest-host azopolymer systems to study the cis-trans thermal isomerization of obtained dyes in solid state. The photovoltaic activity of the azochromophores was tested in bulk-heterojunction solar cells. They acting as weak donors in device with structure ITO\/PEDOT:PSS\/dye:PC70BM\/Al. No photovoltaic response of cells with azocoumarin derivatives bearing 4-fluorobenzene, 3,4-dichlorobenzene, or 4-(1-adamantyl) unit was found. Additionally, dye which showed the best activity was examined in three-component solar cells ITO\/PEDOT:PSS\/PTB7:PC70BM:dye\/PFN\/Al.<\/jats:p>","DOI":"10.3390\/ijms23105767","type":"journal-article","created":{"date-parts":[[2022,5,21]],"date-time":"2022-05-21T09:18:08Z","timestamp":1653124688000},"page":"5767","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Novel Azocoumarin Derivatives\u2014Synthesis and Characterization"],"prefix":"10.3390","volume":"23","author":[{"given":"Katarzyna","family":"Piechowska","sequence":"first","affiliation":[{"name":"Department of Chemical Technology and Pharmaceuticals, Faculty of Pharmacy, Collegium Medicum, Nicolaus Copernicus University, Jurasza 2, 85-089 Bydgoszcz, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9285-4991","authenticated-orcid":false,"given":"Angelika","family":"Baranowska-\u0141\u0105czkowska","sequence":"additional","affiliation":[{"name":"Institute of Physics, Kazimierz Wielki University, Powsta\u0144c\u00f3w Wielkopolskich 2, 85-090 Bydgoszcz, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2107-2719","authenticated-orcid":false,"given":"Krzysztof Z.","family":"\u0141\u0105czkowski","sequence":"additional","affiliation":[{"name":"Department of Chemical Technology and Pharmaceuticals, Faculty of Pharmacy, Collegium Medicum, Nicolaus Copernicus University, Jurasza 2, 85-089 Bydgoszcz, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8096-2661","authenticated-orcid":false,"given":"Jolanta","family":"Konieczkowska","sequence":"additional","affiliation":[{"name":"Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Sk\u0142odowska Str., 41-819 Zabrze, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mariola","family":"Siwy","sequence":"additional","affiliation":[{"name":"Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Sk\u0142odowska Str., 41-819 Zabrze, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marharyta","family":"Vasylieva","sequence":"additional","affiliation":[{"name":"Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Sk\u0142odowska Str., 41-819 Zabrze, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3350-9383","authenticated-orcid":false,"given":"Pawe\u0142","family":"Gnida","sequence":"additional","affiliation":[{"name":"Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Sk\u0142odowska Str., 41-819 Zabrze, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pawe\u0142","family":"Nitschke","sequence":"additional","affiliation":[{"name":"Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Sk\u0142odowska Str., 41-819 Zabrze, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7219-8664","authenticated-orcid":false,"given":"Ewa","family":"Schab-Balcerzak","sequence":"additional","affiliation":[{"name":"Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. 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