title: A magnetic switch for spin-catalyzed interconversion of nuclear spin isomers.
abstract: The interconversion of ortho-hydrogen (oH(2)) and para-hydrogen (pH(2)), the two nuclear spin isomers of dihydrogen, requires a paramagnetic spin catalyst such as a nitroxide. We report the design and demonstration of spin catalysis of the interconversion of oH(2) and pH(2) incarcerated in an endofullerene based on a reversible nitroxide/hydroxylamine system. The system is an example of a reversible magnetic spin catalysis switch that can increase the rate of interconversion of the nuclear spin isomers of H(2) by a factor of approximately 10(4).
authors.affiliation: Department of Chemistry, Columbia University, New York, New York 10027, USA.
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Li
authors.forename: Xuegong
authors.initials: X
authors.lastname: Lei
authors.forename: Steffen
authors.initials: S
authors.lastname: Jockusch
authors.forename: Judy Y-C
authors.initials: JY
authors.lastname: Chen
authors.forename: Michael
authors.initials: M
authors.lastname: Frunzi
authors.forename: Jeremiah A
authors.initials: JA
authors.lastname: Johnson
authors.forename: Ronald G
authors.initials: RG
authors.lastname: Lawler
authors.forename: Yasujiro
authors.initials: Y
authors.lastname: Murata
authors.forename: Michihisa
authors.initials: M
authors.lastname: Murata
authors.forename: Koichi
authors.initials: K
authors.lastname: Komatsu
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Turro