Betaine Chloride-Betaine Tetrachloridoferrate(III)—An Ionic Liquid Related Crystal Structure Governed by the Pearson Concept
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...
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doaj-3cfc432bc5e24659a4e92903f83a45562020-11-24T22:51:50ZengMDPI AGCrystals2073-43522012-03-012111011710.3390/cryst2010110Betaine Chloride-Betaine Tetrachloridoferrate(III)—An Ionic Liquid Related Crystal Structure Governed by the Pearson ConceptAnja-Verena MudringTobias BäckerThe 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 activated methyl donors (soft acid and base). These interactions between the COOH group, as hard H-bond donor, and chloride as hard acceptor besides those between the soft, activated methyl groups and the soft tetrachloridoferrate(III) anions are the major structure-directing forces in the crystal structure of (Hbet)2Cl[FeCl4].http://www.mdpi.com/2073-4352/2/1/110betainechloridetetrachloridoferratedouble salt |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Anja-Verena Mudring Tobias Bäcker |
spellingShingle |
Anja-Verena Mudring Tobias Bäcker Betaine Chloride-Betaine Tetrachloridoferrate(III)—An Ionic Liquid Related Crystal Structure Governed by the Pearson Concept Crystals betaine chloride tetrachloridoferrate double salt |
author_facet |
Anja-Verena Mudring Tobias Bäcker |
author_sort |
Anja-Verena Mudring |
title |
Betaine Chloride-Betaine Tetrachloridoferrate(III)—An Ionic Liquid Related Crystal Structure Governed by the Pearson Concept |
title_short |
Betaine Chloride-Betaine Tetrachloridoferrate(III)—An Ionic Liquid Related Crystal Structure Governed by the Pearson Concept |
title_full |
Betaine Chloride-Betaine Tetrachloridoferrate(III)—An Ionic Liquid Related Crystal Structure Governed by the Pearson Concept |
title_fullStr |
Betaine Chloride-Betaine Tetrachloridoferrate(III)—An Ionic Liquid Related Crystal Structure Governed by the Pearson Concept |
title_full_unstemmed |
Betaine Chloride-Betaine Tetrachloridoferrate(III)—An Ionic Liquid Related Crystal Structure Governed by the Pearson Concept |
title_sort |
betaine chloride-betaine tetrachloridoferrate(iii)—an ionic liquid related crystal structure governed by the pearson concept |
publisher |
MDPI AG |
series |
Crystals |
issn |
2073-4352 |
publishDate |
2012-03-01 |
description |
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 activated methyl donors (soft acid and base). These interactions between the COOH group, as hard H-bond donor, and chloride as hard acceptor besides those between the soft, activated methyl groups and the soft tetrachloridoferrate(III) anions are the major structure-directing forces in the crystal structure of (Hbet)2Cl[FeCl4]. |
topic |
betaine chloride tetrachloridoferrate double salt |
url |
http://www.mdpi.com/2073-4352/2/1/110 |
work_keys_str_mv |
AT anjaverenamudring betainechloridebetainetetrachloridoferrateiiianionicliquidrelatedcrystalstructuregovernedbythepearsonconcept AT tobiasbacker betainechloridebetainetetrachloridoferrateiiianionicliquidrelatedcrystalstructuregovernedbythepearsonconcept |
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