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Alkylpyridinium Tetrahalidometallate Ionic Liquids and Ionic Liquid Crystals: Insights into the Origin of Their Phase Behavior
Author(s) -
Abouserie Ahed,
Zehbe Kerstin,
Metzner Philipp,
Kelling Alexandra,
Günter Christina,
Schilde Uwe,
Strauch Peter,
Körzdörfer Thomas,
Taubert Andreas
Publication year - 2017
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201700826
Subject(s) - chemistry , triclinic crystal system , monoclinic crystal system , ionic liquid , crystallography , ionic bonding , ion , melting point , crystal structure , crystallinity , phase transition , phase (matter) , electron paramagnetic resonance , organic chemistry , nuclear magnetic resonance , physics , catalysis , quantum mechanics
Six N ‐alkylpyridinium salts [C n Py] 2 [MCl 4 ] ( n = 4 or 12 and M = Co, Cu, Zn) were synthesized, and their structure and thermal properties were studied. The [C 4 Py] 2 [MCl 4 ] compounds are monoclinic and crystallize in the space group P 2 1 / n . The crystals of the longer chain analogues [C 12 Py] 2 [MCl 4 ] are triclinic and crystallize in the space group P 1 . Above the melting temperature, all compounds are ionic liquids (ILs). The derivatives with the longer C12 chain exhibit liquid crystallinity and the shorter chain compounds only show a melting transition. Consistent with single‐crystal analysis, electron paramagnetic resonance spectroscopy suggests that the [CuCl 4 ] 2– ions in the Cu‐based ILs have a distorted tetrahedral geometry.