Self-assembled arrays and molecular solids with light-driven functionalities
| Autor: | B. Ventura |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Faculdade de Ciências e Tecnologia da Universidade NOVA de Lisboa-Invited seminar, Lisboa, Portugal, 10/05/2018 info:cnr-pdr/source/autori:B. Ventura/congresso_nome:Faculdade de Ciências e Tecnologia da Universidade NOVA de Lisboa-Invited seminar/congresso_luogo:Lisboa, Portugal/congresso_data:10%2F05%2F2018/anno:2018/pagina_da:/pagina_a:/intervallo_pagine |
| Popis: | Non-covalent arrays, obtained via self-assembly of organic molecules and suitably designed hosts or bridging units, represent an important challenge for the mimicry of bacterial photosynthesis and for applications in photocatalysis and drug delivery. We are interested in exploring photoactive multi-phorphyrinic assemblies based on coordination bonds and some examples will be here presented, with particular highlight on tweezer-like porphyrinic arrays which are able to coordinate photoactive guests and coordination cages which have been designed as size-controlled nanoreactors for the uptake of guests with light-induced functionalities. Recently, in the frame of the H2020-MSCA-RISE project INFUSION, we have explored the excited-state dynamics of photo-switchable chromophores and of their non-covalent complexes with cucurbituril hosts. On the way of exploring new luminescence features from assembled materials, we studied solid structures based on the co-crystallization of organic dyes and halogenated co-formers. The key point is the formation, in the solid structure, of halogen bonds between suitable co-formers and the ? systems of the organic components. Some examples will be here presented, addressing the role of co-crystallization stoichiometry on the phosphorescence vs fluorescence output from these molecular solids. The photophysical properties of the investigated materials have been characterized by means of spectrophotometric and spectrofluorimetric/phosphorimetric analysis and time-resolved techniques with temporal resolution down to hundreds of femtoseconds. |
| Databáze: | OpenAIRE |
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