title: The Cationminus signpi Interaction.
authors.affiliation: Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125.
authors.forename: Jennifer C.
authors.initials: JC
authors.lastname: Ma
authors.forename: Dennis A.
authors.initials: DA
authors.lastname: Dougherty