Synthesis and characterization of the bulk materials was supported by the National Science Foundation through grant DMR-1611525. Additional efforts to synthesize the materials in nanocrystalline form were funded by a grant from the Go KRICT Project for Future Technology of the Korea Research Institute of Chemical Technology (KRICT). We thank G. Halder for assisting with powder diffraction experiments, which were collected at Beamline 17-BM-B at the Advanced Photon Source, a DoE Office of Science User Facility operated by Argonne National Laboratory under contract no. DE-AC02-06CH11357. S.E.R.-L. and S.M.H. thank R. F. Berger and K. Lee for valuable discussions. Theory and computation were supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences (Theory FWP) Materials Sciences and Engineering Division (DE-AC02-05CH11231). Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the US Department of Energy under contract no. DE-AC02-05CH11231. Portions of the computation work were performed at the Molecular Graphics Facility at the Department of Chemistry of UC Berkeley. Support for FP-TRMC measurements conducted by S.S. and T.S. was funded by Japan Society for the Promotion of Science (JSPS) grant no. 15K21721. The FET part was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract no. DE-AC02-05CH11231 (PChem KC3103). We further thank Arkema for fellowship support of M.L.A., the NSF GRFP for fellowship support of L.E.D and J.A.M., and K. R. Meihaus for editing assistance.