Enantiospecific Response in Cross-Polarization Solid-State Nuclear Magnetic Resonance of Optically Active Metal Organic Frameworks
- 17 September 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 142 (42), 17989-17996
- https://doi.org/10.1021/jacs.0c04537
Abstract
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 grounds 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 bio-sensing and quantum storage devices are discussed.Keywords
Funding Information
- Ministerio de Ciencia e Innovaci??n (PGC2018-102052-A-C22, PGC2018-102052-B-C21)
- European Commission (590 702694)
- Eusko Jaurlaritza (IT1254-19)
- Euskal Herriko Unibertsitatea (GIU 17/13 project)
- Agencia Espa??ola de investigaci??n (PGC2018-097529-B-I00)
This publication has 63 references indexed in Scilit:
- Spin-dependent electron transmission through bacteriorhodopsin embedded in purple membraneProceedings of the National Academy of Sciences of the United States of America, 2013
- X-ray analysis on the nanogram to microgram scale using porous complexesNature, 2013
- Gas Adsorption Properties and Selectivity in CuII/Adeninato/Carboxylato Metal–Biomolecule FrameworksEuropean Journal of Inorganic Chemistry, 2012
- Hydrogen Storage in Metal–Organic FrameworksChemical Reviews, 2011
- MOFs, MILs and more: concepts, properties and applications for porous coordination networks (PCNs)New Journal of Chemistry, 2010
- Secondary building units, nets and bonding in the chemistry of metal–organic frameworksChemical Society Reviews, 2009
- Enantioselective catalysis with homochiral metal–organic frameworksChemical Society Reviews, 2009
- An Improved Broadband Decoupling Sequence for Liquid Crystals and SolidsJournal of Magnetic Resonance, 2000
- Solid-state NMR spectroscopy. Distinction of diastereomers and determination of optical purityJournal of the American Chemical Society, 1979
- Interactions between Nuclear Spins in MoleculesPhysical Review B, 1952