3.4.5. FTIR

The FTIR spectra were obtained using a Spectrum Two FT-IR spectrometer equipped with a Universal ATR with a diamond crystal (PerkinElmer, Waltham, MA, USA). The data were collected over the 4000–500 cm−<sup>1</sup> spectral range. Typically, a few microliters were used on the diamond, and the measurements were repeated three times for each sample.
