Spectroscopy of light-molecule endofullerenes

• Published in: Philosophical transactions of the Royal Society of London. Series A: Mathematical, physical, and engineering sciences Vol. 371; no. 1998; p. 20120429
• Main Author: Levitt, Malcolm H.
• Format: Journal Article
• Language: English
• Published: England The Royal Society Publishing 13.09.2013
• Subjects: Endofullerenes; Infrared Spectroscopy; Neutron Scattering; Nuclear Magnetic Resonance; Parahydrogen; Spin Isomers; neutron scattering; endofullerenes; spin isomers; nuclear magnetic resonance; parahydrogen; infrared spectroscopy
• ISSN: 1364-503X; 1471-2962
• DOI: 10.1098/rsta.2012.0429

Molecular endofullerenes are supramolecular systems consisting of fullerene cages encapsulating small molecules. Although most early examples consist of encapsulated metal clusters, recently developed synthetic routes have provided endofullerenes with non-metallic guest molecules in high purity and macroscopic quantities. The encapsulated light molecule behaves as a confined quantum rotor, displaying rotational quantization as well as translational quantization, and a rich coupling between the translational and rotational degrees of freedom. Furthermore, many encapsulated molecules display spin isomerism. Spectroscopies such as inelastic neutron scattering, nuclear magnetic resonance and infrared spectroscopy may be used to obtain information on the quantized energy level structure and spin isomerism of the guest molecules. It is also possible to study the influence of the guest molecules on the cages, and to explore the communication between the guest molecules and the molecular environment outside the cage.