The hexachloroferrate(III) anion stabilized in hydrogen bonded packing arrangements. A comparison of the X-ray crystal structures and low temperature magnetism of tetrakis(methylammonium) hexachloroferrate(III) chloride (I) and tetrakis(hexamethylenediammonium) hexachloroferrate(III) tetrachloroferrate(III) tetrachloride (II)

B.D. James, M. Bakalova, J. Liesegang, W.M. Reiff, D.C.R. Hockless, Brian Skelton, Allan White

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Single crystal X-ray diffraction studies of the title compounds, both having a nominal FeCl7 stoichiometry, indicate that I, with molecular formula C4H24Cl7FeN4, contains [FeCl6](3-) units and is isomorphous with the In(III) compound of similar formula, while II, molecular formula C24H72Cl14Fe2N8, has an unusual symmetric structure containing the three anions [FeCl6](3-), [FeCl4](-) and Cl-. I crystallizes in the space group P2/n, Z = 4 with a = 15.998(3), b = 7.292(1), c = 16.056(3) Angstrom and beta = 103.57(2)degrees; for II: I4(1)/a, Z = 4 with a = 19.216(4) and c = 14.458(4) Angstrom. A combination of Fe-57 Mossbauer and a.c. susceptometry confirm long range magnetic order with 1.39 K <T-critical <1.60 K in I leading to a 3-D antiferromagnetic ground state, which is not magnetically saturated at 1.33 K, while for II the results suggest likely 3-D ordering only in the range 1.2 K > T-critical > 1.0 K. The low ordering temperatures are consistent with the relatively long Fe ... Fe distances in these compounds.
Original languageEnglish
Pages (from-to)169-174
JournalInorganica Chimica Acta
Volume247
DOIs
Publication statusPublished - 1996

Fingerprint Dive into the research topics of 'The hexachloroferrate(III) anion stabilized in hydrogen bonded packing arrangements. A comparison of the X-ray crystal structures and low temperature magnetism of tetrakis(methylammonium) hexachloroferrate(III) chloride (I) and tetrakis(hexamethylenediammonium) hexachloroferrate(III) tetrachloroferrate(III) tetrachloride (II)'. Together they form a unique fingerprint.

Cite this