The quaternized compounds (PzIL1-9) reacted with sodium tetrafluoroborate (NaBF 4) to generate phosphazene based ionic liquids (PzILs), PzIL1a-9a. The newly synthesized ionic compounds (PzIL1a-9a) were verified using elemental CHN analyses and functional and spectroscopic (FTIR and 1 H, 13 c, 31 P-NMR) analyses techniques. The thermal properties of PzIL1a-9a were investigated using thermogravimetric analysis (TGA). According to the initial decomposition temperature values calculated based on the TGA thermograms, PzIL7a (213 °C) was recognized to be more thermally stable than the other PzILs studied. PzIL1a-9a exhibited good solubility in the water and demonstrate a typical dielectric relaxation behavior, conductivity levels for both low and high-frequency regions. AC conductivity mechanisms and dielectric relaxation behavior of each sample are investigated by fabricating parallel plate capacitors. The nucleophilic substitution reactions of phosphazenes are well known 1-3. Thus, a broad array of poly and cyclophosphazene derivatives were obtained. Nevertheless, PzILs obtained by the quaternization of the skeletal or the side-group nitrogen atoms of phosphazene have received much less attention 4. Compounds formed by the protonation of the ring nitrogen atom of the cyclophosphazenes are defined as protic molten salts (PMOSs) or protic ionic liquids (PILs) 5,6. Protonation of the ring nitrogen with various acids was carried out, and the protonation was first determined by infrared and NMR methods 7,8. In later years, the crystal structures of N 3 P 3 Cl 2 (NHPr i) 4 •HCI and [N 3 P 3 HCl 4 (NH 2) 2 ] + [N(POCl 2) 2 ] − were determined by X-ray analysis 9,10. Tun and colleagues observed two types of products, reacting with N 3 P 3 Cl 6 and group 13 Lewis acids.[PCl 2 N] 3 •MX 3 obtained by excluding water or HX is the main product. Whenever MX 3 (AlCl 3 , GaCl 3 , AlBr 3) was used, water traces were always found, and by isolating [PCl 2 N] 3 •HMX 4 (HMX 4 : HAlCl 4 , HGaCl 4 , HAlBr 4) structures as the second product, they detected the location of the protonation by X-ray crystallography 11,12. In recent years, PILs have been synthesized using a variety of cyclophosphazene compounds and bulky acids (salicylic, gentisic, γ-resorcylic acids), and the biological activity of these PMOSs has been investigated 13-15. In addition to these, phosphazenes containing aliphatic and aromatic substituents having terminal tertiary amino groups were synthesized and then quaternized with methyl iodide 16-21. The PzILs with different anions (chloride, Cl − , bis-trifluoromethane sulfonimide, NTf 2 − and tetrafluoroborate, BF 4 −) were obtained by simple anion exchange reactions 17,20-25. On the other hand, PzILs with various molecular weights or different average chain lengths have been used as antibacterial, antifungal and anticancer agents 5,6,13-15 , lubricants 17,25 , adsorbents and surface modifiers 18 , a gate dielectric layer for OFETs 20,21 , electrolyte solutions 19,23,24 and chemosensors for metal ions 26 .
