Betaine chloride-betaine tetrachloridoferrate(III)

  • The first betaine chloride tetrachloroidoferrate(III) double salt, \((Hbet)_{2}Cl[FeCl_{4}]\) = \((Hbet)Cl·(Hbet)[FeCl_{4}]\), was obtained from a solution of betaine hydrochloride (HbetCl) and \(FeCl_{3}∙6\) \(H_{2}O\) in water. The crystal structure (orthorhombic, \(\it Pbcm\), \(\it a\) = 6.2717(13), \(\it b\) = 12.841(3), \(\it c\) = 25.693(5) Å, \(\it Z\) = 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 \((Hbet)_{2}Cl[FeCl_{4}]\).

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Metadaten
Author:Tobias BäckerGND, Anja-Verena MudringGND
URN:urn:nbn:de:hbz:294-70640
DOI:https://doi.org/10.3390/cryst2010110
Parent Title (English):Crystals
Subtitle (English):an ionic liquid related crystal structure governed by the Pearson concept
Publisher:MDPI
Place of publication:Basel
Document Type:Article
Language:English
Date of Publication (online):2020/03/25
Date of first Publication:2012/03/12
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Tag:betaine; chloride; double salt; tetrachloridoferrate
Volume:2
Issue:1
First Page:110
Last Page:117
open_access (DINI-Set):open_access
faculties:Fakultät für Chemie und Biochemie
Licence (English):License LogoCreative Commons - CC BY 3.0 Unported - Attribution 3.0 Unported