We thank EPSRC (EP/I011870, EP/P001386, EP/K038869), ERC (AdG 742041) and the Royal Society and University of Manchester for funding, and EPSRC for funding of the EPSRC National EPR Facility at Manchester. We are especially grateful to the Advanced Light Source (ALS) and Oak Ridge National Laboratory (ORNL) for access to the beamline 11.3.1 and VISION, respectively. This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231. Computing resources were made available through the VirtuES and the ICE-MAN projects, funded by the Laboratory Directed Research and Development program at ORNL. J.L. and X.Z. thank the China Scholarship Council for funding, and A.M.S. thanks the Russian Science Foundation (grant no. 17-73-10320) and the Royal Society of Chemistry for funding. We also thank M. A. Denecke for helpful discussions.