{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T02:38:26Z","timestamp":1760236706617,"version":"build-2065373602"},"reference-count":50,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2021,12,15]],"date-time":"2021-12-15T00:00:00Z","timestamp":1639526400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia","doi-asserted-by":"publisher","award":["SFRH\/BD\/145639\/2019","POCI-01-0145-FEDER-031220"],"award-info":[{"award-number":["SFRH\/BD\/145639\/2019","POCI-01-0145-FEDER-031220"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>Organic\u2013inorganic hybrids (OIH) are materials that can be easily synthesized by the sol\u2013gel method and combine the advantages of organic and inorganic moieties within a single polymeric matrix. Imidazole derivatives are versatile organic compounds that can change their optical properties with the variation of pH due to the protonation or deprotonation of the nitrogen atoms. This work reports the preparation of different OIHs doped with different contents of two imidazole compounds (3a,b). The obtained materials were characterized structurally by FTIR, and the dielectric properties were studied by electrochemical impedance spectroscopy. The optical properties were studied by UV-Vis absorption and fluorescence spectroscopies. The FTIR analysis showed that the presence of the imidazole does not change the structural properties of the matrices. The normalized resistance values obtained for the doped matrices ranged between 8.57 and 9.32 \u2126 cm2, all being higher than the undoped matrix. The \u03c3 ranged between 9.49 and 10.28 S cm\u22121, being all higher than the pure OIH samples. Compound 3a showed a maximum absorption peak at 390 nm, which is present in the OIH spectra, proving the presence of the compound. In the case of compound 3b, a maximum absorption wavelength at 412 nm was found, and the compound peak was not clear, which may indicate that an interaction between the compound and the matrix occurred. A synergetic effect between the intrinsic emission of the matrix and the fluorescence of 3a is found on the OIH-doped matrices.<\/jats:p>","DOI":"10.3390\/nano11123401","type":"journal-article","created":{"date-parts":[[2021,12,15]],"date-time":"2021-12-15T21:47:36Z","timestamp":1639604856000},"page":"3401","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Hybrid Sol\u2013Gel Matrices Doped with Colorimetric\/Fluorimetric Imidazole Derivatives"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3741-3039","authenticated-orcid":false,"given":"Rui P. C. L.","family":"Sousa","sequence":"first","affiliation":[{"name":"Centre of Chemistry, Campus of Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8146-4231","authenticated-orcid":false,"given":"Rita B.","family":"Figueira","sequence":"additional","affiliation":[{"name":"Centre of Chemistry, Campus of Gualtar, University of Minho, 4710-057 Braga, Portugal"},{"name":"Vasco da Gama CoLAB, Rua Roberto Frias, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1578-3223","authenticated-orcid":false,"given":"B\u00e1rbara R.","family":"Gomes","sequence":"additional","affiliation":[{"name":"Centre of Chemistry, Campus of Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7620-5008","authenticated-orcid":false,"given":"Sara","family":"Sousa","sequence":"additional","affiliation":[{"name":"Centre of Chemistry, Campus of Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"given":"R. Cristina M.","family":"Ferreira","sequence":"additional","affiliation":[{"name":"Centre of Chemistry, Campus of Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7915-4720","authenticated-orcid":false,"given":"Susana P. G.","family":"Costa","sequence":"additional","affiliation":[{"name":"Centre of Chemistry, Campus of Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7996-1626","authenticated-orcid":false,"given":"M. Manuela M.","family":"Raposo","sequence":"additional","affiliation":[{"name":"Centre of Chemistry, Campus of Gualtar, University of Minho, 4710-057 Braga, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,12,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"741","DOI":"10.1038\/127741a0","article-title":"Coherent Expanded Aerogels and Jellies","volume":"127","author":"Kistler","year":"1931","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1021\/cr00099a003","article-title":"The Sol-Gel Process","volume":"90","author":"Hench","year":"1990","journal-title":"Chem. Rev."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"681","DOI":"10.1016\/0022-3093(85)90388-6","article-title":"New Type of Non-Crystalline Solids between Inorganic and Organic Materials","volume":"73","author":"Schmidt","year":"1985","journal-title":"J. Non-Cryst. 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