Infrared spectra were obtained using a Nicolet Nexus 870 FTIR
spectrometer with a smart endurance single bounce diamond ATR
cell. Spectra over the 4000–525 cm−1 range were obtained by the
co-addition of 128 scans with a resolution of 4 cm−1 and a mirror
velocity of 0.6329 cm/s. Spectra were co-added to improve the
signal to noise ratio.