Mechanochromic luminescence and liquid crystallinity of molecular copper clusters
| Autor: | Alain Garcia, Brendan Huitorel, Thierry Gacoin, Sandrine Perruchas, Quentin Benito, Alexandre Fargues, Franck Camerel, Jean-Pierre Boilot |
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| Přispěvatelé: | Laboratoire de physique de la matière condensée (LPMC), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), The authors thank the CNRS and the Ecole Polytechnique for funding., Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Mechanochromic luminescence
Photoluminescence Materials science Luminescence General Chemical Engineering X ray scattering Mechanical constraints 02 engineering and technology Temperature dependent photoluminescences 010402 general chemistry Photochemistry Ligands 01 natural sciences 7. Clean energy Liquid crystal Differential scanning calorimetry Materials Chemistry [CHIM]Chemical Sciences Mechanochromic properties Self assembled structures Phosphorus compounds Alkyl chemistry.chemical_classification Thermochromism Small-angle X-ray scattering Liquid crystals Copper compounds Mesophase Intramolecular interactions Crystalline materials Liquids General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry 13. Climate action Energy transfer Polarized optical microscopy Liquid crystalline properties 0210 nano-technology Resonance energy transfer Copper |
| Zdroj: | Chemistry of Materials Chemistry of Materials, American Chemical Society, 2016, 28 (22), pp.8190--8200. ⟨10.1021/acs.chemmater.6b03002⟩ Chemistry of Materials, 2016, 28 (22), pp.8190--8200. ⟨10.1021/acs.chemmater.6b03002⟩ |
| ISSN: | 0897-4756 1520-5002 |
| DOI: | 10.1021/acs.chemmater.6b03002⟩ |
| Popis: | International audience; Molecular copper iodide clusters with the [Cu4I4] cubane core have been functionalized by phosphine ligands carrying protomesogenic gallate-based derivatives bearing either long alkyl chains (C8, C12, and C16) or cyanobiphenyl (CBP) fragments. The mesomorphic properties of the functionalized clusters were studied by combining differential scanning calorimetry (DSC), polarized optical microscopy (POM), and small-angle X-ray scattering (SAXS) experiments. Whereas clusters functionalized solely with long alkyl chains present amorphous or crystalline states, the cluster carrying CBP fragments displays liquid crystal properties with the formation of a smectic A mesophase from room temperature up to 100 °C. Temperature-dependent photoluminescence measurements show that the CBP derivative displays an unusual luminescence thermochromism which is possibly due to a resonance energy transfer mechanism between the emissive [Cu4I4] inorganic and CBP moieties. The emission properties of this original cluster are also sensitive to variation of local order of the molecular assembly. Moreover, the liquid crystalline properties imported on the inorganic core allow for a facile deformation of its local environment, leading to mechanochromic properties related to modulation of intramolecular interactions. Indeed, mechanical constraints on the molecularly self-assembled structure induce changes at the molecular level by modification of the [Cu4I4] inorganic cluster core geometry and in particular of the strength of the cuprophilic interactions. |
| Databáze: | OpenAIRE |
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