*3.7. UATR-FTIR Spectroscopy*

The UATR-FTIR spectroscopic analysis was performed using a Perkin Elmer SPEC-TRUM 100 device. The data were collected directly on solid samples in the spectral domain 4000–600 cm−<sup>1</sup> on an UATR device. Spectra were built up after a number of 16 co-added acquisitions, with a spectral resolution of 4 cm−<sup>1</sup> .
