TGA analyses were collected on a TA Instruments SDT-Q600 using 50 mL/min air as a sweep gas. ESI mass spectra were collected on dilute acetonitrile solutions using an Agilent 6520 QTOF LC-MS in positive ion mode. NMR data were collected on a Bruker Avance III 400 MHz spectrometer using a 5mm BBFO+ probe. All 1 H and 13 C NMR spectra were referenced to their respective solvent resonances.