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Betaine Chloride-Betaine Tetrachloridoferrate(Iii)—An Ionic Liquid Related Crystal Structure Governed By The Pearson Concept, Anja V. Mudring, Tobias Backer
Betaine Chloride-Betaine Tetrachloridoferrate(Iii)—An Ionic Liquid Related Crystal Structure Governed By The Pearson Concept, Anja V. Mudring, Tobias Backer
Anja V. Mudring
The first betaine chloride tetrachloroidoferrate(III) double salt, (Hbet)2Cl[FeCl4] = (Hbet)Cl·(Hbet)[FeCl4], was obtained from a solution of betaine hydrochloride (HbetCl) and FeCl3∙6 H2O in water. The crystal structure (orthorhombic, Pbcm, a = 6.2717(13), b = 12.841(3), c = 25.693(5) Å, Z = 4) is characterized by layers of tetrachloridoferrate(III) anions separated by chloride-bridged, H-bond mediated cationic (Hbet) dimers. The hydrogen bonding network in the crystal structure follows the Pearson HSAB (hard acid-soft base) concept: According to the Pearson concept, the chloride anions show high affinity to the carboxyl group (hard acid and base), and the tetrachloroidoferrate(III) anion preferentially interacts with the …