{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T13:57:04Z","timestamp":1789999024449,"version":"4.0.1"},"reference-count":68,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2019,3,15]],"date-time":"2019-03-15T00:00:00Z","timestamp":1552608000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003329","name":"Ministerio de Econom\u00eda y Competitividad","doi-asserted-by":"publisher","award":["MAT2014-57646-P"],"award-info":[{"award-number":["MAT2014-57646-P"]}],"id":[{"id":"10.13039\/501100003329","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003329","name":"Ministerio de Econom\u00eda y Competitividad","doi-asserted-by":"publisher","award":["MAT2017-82288-C2-1-P"],"award-info":[{"award-number":["MAT2017-82288-C2-1-P"]}],"id":[{"id":"10.13039\/501100003329","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Micro- and mesoporous silica-based materials are a class of porous supports that can encapsulate different guest molecules. The formation of these hybrid complexes can be associated with significant alteration of the physico-chemical properties of the guests. Here, we report on a photodynamical study of a push\u2013pull molecule, trans-4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM), entrapped within faujasite-type zeolites (HY, NaX, and NaY) and MCM-41 in dichloromethane suspensions. The complex formation gives rise to caged monomers and H- and J-aggregates. Steady-state experiments show that the nanoconfinement provokes net blue shifts of both the absorption and emission spectra, which arise from preferential formation of H-aggregates concomitant with a distortion and\/or protonation of the DCM structure. The photodynamics of the hybrid complexes are investigated by nano- to picosecond time-resolved emission experiments. The obtained fluorescence lifetimes are 65\u201399 ps and 350\u2013400 ps for H- and J-aggregates, respectively, while those of monomers are 2.46\u20133.87 ns. Evidences for the presence of a charge-transfer (CT) process in trapped DCM molecules (monomers and\/or aggregates) are observed. The obtained results are of interest in the interpretation of electron-transfer processes, twisting motions of analogues push\u2013pull systems in confined media and understanding photocatalytic mechanisms using this type of host materials.<\/jats:p>","DOI":"10.3390\/ijms20061316","type":"journal-article","created":{"date-parts":[[2019,3,18]],"date-time":"2019-03-18T04:06:55Z","timestamp":1552882015000},"page":"1316","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Confinement Effect of Micro- and Mesoporous Materials on the Spectroscopy and Dynamics of a Stilbene Derivative Dye"],"prefix":"10.3390","volume":"20","author":[{"given":"Maria Rosaria","family":"di Nunzio","sequence":"first","affiliation":[{"name":"Departamento de Qu\u00edmica F\u00edsica, Facultad de Ciencias Ambientales y Bioqu\u00edmica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S\/N, 45071 Toledo, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6551-6479","authenticated-orcid":false,"given":"Ganchimeg","family":"Perenlei","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica F\u00edsica, Facultad de Ciencias Ambientales y Bioqu\u00edmica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S\/N, 45071 Toledo, Spain"},{"name":"Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD 4001, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2247-7566","authenticated-orcid":false,"given":"Abderrazzak","family":"Douhal","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica F\u00edsica, Facultad de Ciencias Ambientales y Bioqu\u00edmica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S\/N, 45071 Toledo, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2019,3,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"13639","DOI":"10.1021\/acs.chemrev.7b00422","article-title":"Photochemistry and Photophysics in Silica-Based Materials: Ultrafast and Single Molecule Spectroscopy Observation","volume":"117","author":"Alarcos","year":"2017","journal-title":"Chem. 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