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Structural and Physicochemical Characteristics of Tetrabutylammonium Tetrahalogenoferrates(III), [(C 4 H 9 ) 4 N][FeBr 4−n Cl n ]
Author(s) -
Wyrzykowski Dariusz,
Kruszyński Rafał,
Kucharska Urszula,
Warnke Zygmunt
Publication year - 2006
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.200500472
Subject(s) - chemistry , isostructural , acetonitrile , crystallography , hydrogen bond , crystal structure , inorganic chemistry , molecule , organic chemistry
A series of tetrahalogenoferrates(III), [FeBr 4−n Cl n ] − (n=0‐4) stabilized with the tetrabutylammonium cation, of general formula [(C 4 H 9 ) 4 N][FeBr 4−n Cl n ], has been synthesized. The crystal and molecular structure of [(C 4 H 9 ) 4 N][FeCl 4 ] was determined. The iron cation adopts slightly distorted tetrahedral coordination with two opposite angles smaller than tetrahedral one, two equal to tetrahedral and two larger than tetrahedral. The bond valences were computed. The total valence of iron atom is equal to 3.08. In the structure can be found only one hydrogen bond C(1)–H···Cl. Except mentioned there are no unusually intermolecular short contacts between ions existing in the structure. All [(C 4 H 9 ) 4 N][FeBr 4−n Cl n ] (n=0‐4) compounds are isostructural in solid state. On the basis of conductometric measurements, relative stabilities of the anions have been estimated in methanol (MeOH), dimethyl sulfoxide (DMSO), acetone (AC), acetonitrile (AN) and dichloromethane (CH 2 Cl 2 ) representing both polar (including amphiprotic and aprotic) as well as non‐polar solvents. Further, the dissociation constants of the compounds were calculated from the expanded Pitt's conductivity equation. The results of the conductometric measurements were supported by electronic spectra.