0000000001301982
AUTHOR
Jon M. Matxain
Breaking Bonds and Forming Nanographene Diradicals with Pressure.
New anthanthrone-based polycyclic scaffolds possessing peripheral crowed quinodimethanes have been prepared. While the compounds adopt a closed-shell butterfly shaped structure in the ground state, a concave-to-convex fluxional dynamic inversion is accessible with a low energy barrier through an open-shell diradicaloid transition-state. Mainly driven by the release of strainattributed to the steric hindrance at the peri position of the anthanthrone core, a low-lying open-shell diradical is accessible through planarization of the core, which can be achieved by thermal excitation in solution. Alternatively, planarization can be achieved by application of mild pressure in the solid state, in w…
Enantiospecific Response in Cross-Polarization Solid-State Nuclear Magnetic Resonance of Optically Active Metal Organic Frameworks.
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 e…
CCDC 1990183: Experimental Crystal Structure Determination
Related Article: Eider San Sebastian, Javier Cepeda, Uxua Huizi-Rayo, Alessio Terenzi, Daniel Finkelstein-Shapiro, Daniel Padro, Jose Ignacio Santos, Jon M. Matxain, Jesus M. Ugalde, Vladimiro Mujica|2020|J.Am.Chem.Soc.|142|17989|doi:10.1021/jacs.0c04537
CCDC 1990182: Experimental Crystal Structure Determination
Related Article: Eider San Sebastian, Javier Cepeda, Uxua Huizi-Rayo, Alessio Terenzi, Daniel Finkelstein-Shapiro, Daniel Padro, Jose Ignacio Santos, Jon M. Matxain, Jesus M. Ugalde, Vladimiro Mujica|2020|J.Am.Chem.Soc.|142|17989|doi:10.1021/jacs.0c04537
CCDC 1542456: Experimental Crystal Structure Determination
Related Article: Maude Desroches, Paula Mayorga Burrezo, Joël Boismenu-Lavoie, Miriam Peña Álvarez, Carlos J. Gómez-García, Jon M. Matxain, David Casanova, Jean-François Morin, Juan Casado|2017|Angew.Chem.,Int.Ed.|56|16212|doi:10.1002/anie.201708740