{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T14:57:06Z","timestamp":1774277826959,"version":"3.50.1"},"reference-count":56,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2013,5,15]],"date-time":"2013-05-15T00:00:00Z","timestamp":1368576000000},"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>A water-soluble indocarbocyanine dye was synthesized and its photophysics were studied for the first time on two solid hosts, microcrystalline cellulose and b-cyclodextrin, as well as in homogeneous media. The inclusion of the indocarbocyanine moiety onto microcrystalline cellulose increased the dye aggregation with both H and J aggregates being formed. Adsorption on b-cyclodextrin enhanced aggregation in a similar way. The fluorescence quantum yields were determined for the powdered samples of the cyanine dye on the two hosts and a significant increase was observed relative to homogeneous solution. A remarkable concentration dependence was also detected in both cases. A lifetime distribution analysis has shown that the indocarbocyanine dye mainly occupies the amorphous part of cellulose and is not entrapped in the crystalline part of this host. In the b-CD case, the adsorption occurs outside the host cavity. In both hosts a strong concentration quenching effect is observed and only monomers emit. Both adsorptions may be explained by stereochemical constraints imposed by the two long sulphoethyl tails linked to nitrogen atoms of the indocarbocyanine dye.<\/jats:p>","DOI":"10.3390\/molecules18055648","type":"journal-article","created":{"date-parts":[[2013,5,15]],"date-time":"2013-05-15T12:29:39Z","timestamp":1368620979000},"page":"5648-5668","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Photophysical Studies of a New Water Soluble Indocarbocyanine Dye Adsorbed onto Microcrystalline Cellulose and beta-Cyclodextrin"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7744-529X","authenticated-orcid":false,"given":"Reda","family":"El-Shishtawy","sequence":"first","affiliation":[{"name":"UMTP - Unidade de Materiais T\u00eaxteis e Papeleiros e Departamento de Qu\u00edmica, Universidade da Beira Interior, Rua Marqu\u00eas d'\u00c1vila e Bolama, Covilh\u00e3 6200-001, Portugal"},{"name":"Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia"}]},{"given":"Anabela","family":"Oliveira","sequence":"additional","affiliation":[{"name":"CQFM - Centro de Qu\u00edmica - F\u00edsica Molecular e IN - Instituto de Nanoci\u00eancia e Nanotecnologias, Instituto Superior T\u00e9cnico, Universidade T\u00e9cnica de Lisboa, Av. Rovisco Pais 1049-001, Lisboa, Portugal"},{"name":"C3i - Coordena\u00e7\u00e3o Interdisciplinar de Investiga\u00e7\u00e3o e Inova\u00e7\u00e3o, Instituto Polit\u00e9cnico de Portalegre, P-7300-110, Portalegre, Portugal"}]},{"given":"Paulo","family":"Almeida","sequence":"additional","affiliation":[{"name":"UMTP - Unidade de Materiais T\u00eaxteis e Papeleiros e Departamento de Qu\u00edmica, Universidade da Beira Interior, Rua Marqu\u00eas d'\u00c1vila e Bolama, Covilh\u00e3 6200-001, Portugal"},{"name":"CICS - Centro de Investiga\u00e7\u00e3o em Ci\u00eancias da Sa\u00fade, Universidade da Beira Interior, Av. Infante D. Henrique, 6200-506 Covilh\u00e3, Portugal"}]},{"given":"Diana","family":"Ferreira","sequence":"additional","affiliation":[{"name":"CQFM - Centro de Qu\u00edmica - F\u00edsica Molecular e IN - Instituto de Nanoci\u00eancia e Nanotecnologias, Instituto Superior T\u00e9cnico, Universidade T\u00e9cnica de Lisboa, Av. Rovisco Pais 1049-001, Lisboa, Portugal"}]},{"given":"David","family":"Concei\u00e7\u00e3o","sequence":"additional","affiliation":[{"name":"CQFM - Centro de Qu\u00edmica - F\u00edsica Molecular e IN - Instituto de Nanoci\u00eancia e Nanotecnologias, Instituto Superior T\u00e9cnico, Universidade T\u00e9cnica de Lisboa, Av. Rovisco Pais 1049-001, Lisboa, Portugal"}]},{"given":"Luis","family":"Ferreira","sequence":"additional","affiliation":[{"name":"CQFM - Centro de Qu\u00edmica - F\u00edsica Molecular e IN - Instituto de Nanoci\u00eancia e Nanotecnologias, Instituto Superior T\u00e9cnico, Universidade T\u00e9cnica de Lisboa, Av. Rovisco Pais 1049-001, Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2013,5,15]]},"reference":[{"key":"ref_1","unstructured":"Tyutyulkov, N., Fabian, J., Mehlhorn, A., Dietz, F., and Tadjer, A. (1991). Polymethine Dyes, Structure and Properties, St. Kliment Ohridski University Press."},{"key":"ref_2","unstructured":"Zollinger, H. (1988). Color Chemistry, VCH."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"781","DOI":"10.1016\/j.tet.2011.10.069","article-title":"Synthesis of cyanine dyes: A review","volume":"68","author":"Panighahi","year":"2012","journal-title":"Tetrahedron"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1016\/S0927-0248(03)00113-2","article-title":"Efficient sensitization of nanocristaline TiO2 films with cyanines and merocyanines organic dyes","volume":"80","author":"Sayama","year":"2003","journal-title":"Sol. Energy Mater. Sol. 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