Magnetic measurements were performed on a Quantum Design MPMS3 superconducting quantum interference device (SQUID) magnetometer. Finely ground powder samples (28-36 mg) were restrained in eicosane (14-18 mg) and flame sealed in a borosilicate tube under vacuum (see Supporting Information Table ). Sealed samples were loaded into plastic straws and held in place by friction between diamagnetic tape at the top of the tube and the straw. Raw magnetic data were scaled for the shape of the sample using Quantum Design MPMS3 Geometry Correction Simulator, corrected for the diamagnetic contribution of the sample holder (straw and borosilicate tube) and corrected for the mass of eicosane. The molar susceptibility was corrected for the intrinsic diamagnetic contribution of the sample, estimated as the molecular weight (g mol -1 ) multiplied by 0.5 × 10 -6 cm 3 K mol Continuous wave electron paramagnetic resonance (EPR) spectra were recorded at X-band (ca. 9.4 GHz) frequency on a Bruker EMXPlus spectrometer with 1.8 T electromagnet and Stinger closed-cycle helium gas cryostat.