NMR spectra were acquired at the MIT Department of Chemistry Instrumentation Facility (DCIF) on Bruker Avance-III HD Nanobay (400 MHz) and Bruker Avance Neo spectrometers (400 and 500 MHz) at ambient temperatures. Referencing was performed during data acquisition using universal chemical shift referencing against the deuterated solvent used. Data in NMR spectra were reported as detailed below: chemical shift (ppm), integration, peak shape (br = broad, s = singlet, d = doublet, t = triplet, m = multiplet, qu = quintet), coupling constant (Hz). EPR spectrum was acquired on a Bruker EMX-Plus spectrometer with an X-band resonator at 4.5 K. Mnova (https://mestrelab.com/) is necessary to open the processed files (.mnova). Raw data files may be opened with any NMR processing software.