Premium
Precise Fixation of an NO Molecule inside Carbon Nanopores: A Long‐Range Electron–Nuclear Interaction
Author(s) -
Hashikawa Yoshifumi,
Hasegawa Shota,
Murata Yasujiro
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202012538
Subject(s) - nanopore , molecule , chemical physics , chemistry , paramagnetism , carbon fibers , fullerene , nanotechnology , raman spectroscopy , crystallography , materials science , condensed matter physics , physics , organic chemistry , composite material , composite number , optics
[60]Fullerene‐based carbon nanopores were synthesized to enable the placement of two molecules of nitric oxide (NO) at an accurate distance from one another. A linear orientation of the two NO molecules inside the assembled nanopores was confirmed crystallographically. Theoretical studies suggested possible free rotation inside the carbon nanopore, while the two conformations of NO in which its long axis was oriented toward the orifice of the nanopore were predicted to be dominant. The paramagnetic shifts caused by NO showed a major contribution from the Fermi contact mechanism. The Solomon–Bloembergen theory was found to describe well the paramagnetic relaxation enhancement of a water molecule in a paired nanopore even under equilibrium as a result of fixing of the NO molecule with a distance of approximately 12 Å, thus demonstrating a long‐range bimolecular magnetic interaction.