Other funding sources: U.S. National Science Foundation (grant CHE-2003411), Oxford Advanced Research Computing (ARC) for computational resources and Keble College, Oxford, for appointing M.A.P. as a Senior Research Visitor. Use of APS, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by ANL, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357.

Additional files for our submitted research paper. Optimized molecular geometries (xyz coordinates) of neutral cyclophane and its di- and tetraanion in gas phase, CAM-B3LYP def2-TZVP level of theory, calculated using Gaussian16 software.