Enantiospecific Response in Cross-Polarization Solid-State Nuclear Magnetic Resonance of Optically Active Metal Organic Frameworks
| Autor: | Daniel Padro, Javier Cepeda, José I. Santos, Vladimiro Mujica, Alessio Terenzi, Jesus M. Ugalde, Uxua Huizi-Rayo, Eider San Sebastian, Daniel Finkelstein-Shapiro, Jon M. Matxain |
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| Přispěvatelé: | San Sebastian E., Cepeda J., Huizi-Rayo U., Terenzi A., Finkelstein-Shapiro D., Padro D., Santos J.I., Matxain J.M., Ugalde J.M., Mujica V. |
| Rok vydání: | 2020 |
| Předmět: |
Magnetic Resonance Spectroscopy
Optical Phenomena media_common.quotation_subject 010402 general chemistry 01 natural sciences Biochemistry Asymmetry Catalysis Colloid and Surface Chemistry Polarization (electrochemistry) Spin (physics) Quantum Metal-Organic Frameworks media_common Chemistry Circular Dichroism Relaxation (NMR) General Chemistry Carbon-13 NMR Metal Organic Framework NMR 0104 chemical sciences Chemical bond Solid-state nuclear magnetic resonance Chemical physics Settore CHIM/03 - Chimica Generale E Inorganica Condensed Matter::Strongly Correlated Electrons |
| Zdroj: | Journal of the American Chemical Society. 142(42) |
| ISSN: | 1520-5126 |
| Popis: | We report herein on a NMR-based enantiospecific response for a family of optically active metal-organic frameworks. Cross-polarization of the 1H-13C couple was performed, and the intensities of the 13C nuclei NMR signals were measured to be different for the two enantiomers. In a direct-pulse experiment, which prevents cross-polarization, the intensity difference of the 13C NMR signals of the two nanostructured enantiomers vanished. This result is due to changes of the nuclear spin relaxation times due to the electron spin spatial asymmetry induced by chemical bond polarization involving a chiral center. These experiments put forward on firm ground that the chiral-induced spin selectivity effect, which induces chemical bond polarization in the J-coupling, is the mechanism responsible for the enantiospecific response. The implications of this finding for the theory of this molecular electron spin polarization effect and the development of quantum biosensing and quantum storage devices are discussed. |
| Databáze: | OpenAIRE |
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