{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,4]],"date-time":"2026-04-04T14:48:18Z","timestamp":1775314098092,"version":"3.50.1"},"reference-count":44,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2011,7,8]],"date-time":"2011-07-08T00:00:00Z","timestamp":1310083200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>An imidazolium tetrasubstituted cationic porphyrin derivative (the free base and its Zn(II) complex) with five-membered heterocyclic groups in the meso-positions were synthesized using microwave irradiation, and the compounds obtained characterized by 1H-NMR and mass spectrometry. We observed that under microwave irradiation the yield is similar to when the synthesis is performed under conventional heating, however, the time required to prepare the porphyrins decreases enormously. In order to investigate the electronic state of these compounds, we employed UV-Vis and fluorescence spectroscopy combined with quantum chemical calculations. The results reveal the presence, in both compounds, of a large number of electronic states involving the association between the Soret and a blue-shifted band. The Soret band in both compounds also shows a considerable solvent dependence. As for emission, these compounds present low quantum yield at room temperature and no solvent influence on the fluorescence spectra was observed.<\/jats:p>","DOI":"10.3390\/molecules16075807","type":"journal-article","created":{"date-parts":[[2011,7,8]],"date-time":"2011-07-08T16:49:06Z","timestamp":1310143746000},"page":"5807-5821","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Synthesis and Spectroscopic Characterization of Two Tetrasubstituted Cationic Porphyrin Derivatives"],"prefix":"10.3390","volume":"16","author":[{"given":"Antonio E.H.","family":"Machado","sequence":"first","affiliation":[{"name":"Laborat\u00f3rio de Fotoqu\u00edmica, Instituto de Qu\u00edmica, Universidade Federal de Uberl\u00e2ndia, P.O. Box 593, CEP 38400-902 Uberl\u00e2ndia, Minas Gerais, Brazil"}]},{"given":"Weverson R.","family":"Gomes","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Fotoqu\u00edmica, Instituto de Qu\u00edmica, Universidade Federal de Uberl\u00e2ndia, P.O. Box 593, CEP 38400-902 Uberl\u00e2ndia, Minas Gerais, Brazil"}]},{"given":"Diesley M.S.","family":"Ara\u00fajo","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Fotoqu\u00edmica, Instituto de Qu\u00edmica, Universidade Federal de Uberl\u00e2ndia, P.O. Box 593, CEP 38400-902 Uberl\u00e2ndia, Minas Gerais, Brazil"}]},{"given":"H\u00e9rcules S.","family":"Miglio","sequence":"additional","affiliation":[{"name":"Centro de Ci\u00eancias Agr\u00e1rias, Universidade Federal do Esp\u00edrito Santo, Alegre, Esp\u00edrito Santo, Brazil"}]},{"given":"Leonardo T.","family":"Ueno","sequence":"additional","affiliation":[{"name":"Faculdade de Ci\u00eancias Integradas do Pontal, Universidade Federal de Uberl\u00e2ndia, Ituiutaba, Minas Gerais, Brazil"}]},{"given":"Rodrigo De","family":"Paula","sequence":"additional","affiliation":[{"name":"Centro de Forma\u00e7\u00e3o de Professores, Universidade Federal do Rec\u00f4ncavo da Bahia, Amargosa, Bahia, Brazil"},{"name":"Departamento de Qu\u00edmica,Universidade de Aveiro, Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5495-5126","authenticated-orcid":false,"given":"Jos\u00e9 A.S.","family":"Cavaleiro","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica,Universidade de Aveiro, Aveiro, Portugal"}]},{"given":"Newton M. Barbosa","family":"Neto","sequence":"additional","affiliation":[{"name":"Instituto de F\u00edsica, Universidade Federal de Uberl\u00e2ndia, P.O. Box 593; CEP 38400-902 Uberl\u00e2ndia, Minas Gerais, Brazil"}]}],"member":"1968","published-online":{"date-parts":[[2011,7,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"995","DOI":"10.1039\/b705853e","article-title":"Singlet oxygen quantum yields of potential porphyrin-based photosensitisers for photodynamic therapy","volume":"6","author":"Mathai","year":"2007","journal-title":"Photochem. Photobiol. Sci."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"2153","DOI":"10.1016\/j.jorganchem.2009.02.020","article-title":"\u2018Click\u2019 silica immobilisation of metallo-porphyrin complexes and their application in epoxidation catalysis","volume":"694","author":"McDonald","year":"2009","journal-title":"J. Organomet. 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