Large Polyhedral Oligomeric Silsesquioxane Cages: The Isolation of Functionalized POSS with an Unprecedented Si 18 O 27 Core
| Autor: | Naseem A. Ramsahye, Mathilde Laird, Masafumi Unno, John R. Bartlett, Michel Wong Chi Man, Carole Carcel, Cédric Totée, Niklas Herrmann |
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| Přispěvatelé: | Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Western Sydney University |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
010405 organic chemistry [CHIM.MATE]Chemical Sciences/Material chemistry General Chemistry 02 engineering and technology General Medicine 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis Silsesquioxane Single isomer 0104 chemical sciences Crystallography chemistry.chemical_compound [CHIM.POLY]Chemical Sciences/Polymers chemistry Atom Fourier transform infrared spectroscopy 0210 nano-technology |
| Zdroj: | Angewandte Chemie International Edition Angewandte Chemie International Edition, Wiley-VCH Verlag, 2021, 60 (6), pp.3022-3027. ⟨10.1002/anie.202010458⟩ |
| ISSN: | 1521-3757 0044-8249 1433-7851 1521-3773 |
| DOI: | 10.1002/ange.202010458 |
| Popis: | International audience; The synthesis of organo-functionalized polyhedral oligomeric silsesquioxanes (POSS, (R-SiO1.5)n, Tn) is an area of significant activity. To date, T14 is the largest such cage synthesized and isolated as a single isomer. Herein, we report an unprecedented, single-isomer styryl-functionalized T18 POSS. Unambiguously identified among nine possible isomers by multinuclear solution NMR (1H, 13C, and 29Si), MALDI-MS, FTIR, and computational studies, this is the largest single-isomer functionalized Tn compound isolated to date. A ring-strain model was developed to correlate the 29Si resonances with the number of 6-, 5-, and/or 4-Si-atom rings that each non-equivalent Si atom is part of. The model successfully predicts the speciation of non-equivalent Si atoms in other families of Tn compounds, demonstrating its general applicability for assigning 29Si resonances to Si atoms in cage silsesquioxanes and providing a useful tool for predicting Si-atom environments |
| Databáze: | OpenAIRE |
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