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Synthesis, Characterization, and Physicochemical Properties of Hydrophobic Pyridinium‐based Ionic Liquids with N ‐Propyl and N ‐Isopropyl
Author(s) -
Matandabuzo Mzukisi,
Ajibade Peter A.
Publication year - 2018
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201800006
Subject(s) - pyridinium , ionic liquid , hexafluorophosphate , bromide , solubility , thermal stability , chemistry , isopropyl , alkyl , inorganic chemistry , ionic bonding , melting point , organic chemistry , ion , catalysis
Synthesis and physicochemical properties of four pyridinium‐based ionic liquids (ILs), N ‐propylpyridinium bromide [ N ‐propylPyr] + [Br] – , N ‐isopropylpyridinium bromide [ N ‐isopropylPyr] + [Br] – , N ‐propylpyridinium hexafluorophosphate [ N ‐propylPyr] + [PF 6 ] – , and N ‐isopropylpyridinium hexafluorophosphate [ N ‐isopropylPyr] + [PF 6 ] – are reported. The molecular structures of these compounds were characterized by FT‐IR, 1 H, 19 F, and 31 P NMR, spectroscopy. The thermal properties, conductivity, and solubility of these ionic liquids were also investigated. The effects of propyl and isopropyl alkyl lateral chain at the N ‐position of pyridinium cation on the thermal stability, conductivity, and solubility of ionic liquids are discussed. The results obtained confirmed that the ionic liquids based on pyridinium cations exhibit higher decomposition temperature, low melting points, immiscible with water, and their conductivities are mainly influenced by mobility of ions.