*3.1. General Information*

IR spectra were obtained on a "Bruker IFS-25" spectrometer (Bruker, Billerica, MA, USA) (KBr pellets or films in 400–4000 cm−<sup>1</sup> region). 1H (400.13 MHz) and 13C (100.6 MHz) NMR spectra were recorded on a "Bruker Avance 400" instrument (Bruker, Billerica, MA, USA) in CDCl3. The assignment of signals in the 1H NMR spectra was made using COSY and NOESY experiments. Resonance signals of carbon atoms were assigned based on 1H- 13C HSQC and 1H-13C HMBC experiments. The 1H chemical shifts (δ) were referenced to the residual solvent protons (7.26 ppm, CDCl3), and the 13C chemical shifts were expressed with respect to the deuterated solvent (77.16 ppm). Coupling constants in hertz (Hz) were measured from one-dimensional spectra, and multiplicities were abbreviated as follows: br (broad), s (singlet), d (doublet), t (triplet), and m (multiplet). The chemical shifts were recorded in ppm. The (C, H, N) microanalyses were performed on a Flash EA 1112 CHNS-O/MAS (CHN Analyzer) instrument (Thermo Finnigan, Italy). Sulfur was determined by complexometric titration with Chlorasenazo III. Fluorine content was determined on a SPECOL 11 (Carl Zeiss Jena, Germany) spectrophotometer. Melting points (uncorrected) were determined with SMP50 Stuart Automatic melting point (Cole-Palmer Ltd. Stone, Staffordshire, UK).
