Spontaneous enanti-omorphism in poly-phased alkaline salts of tris-(oxalato)ferrate(III): crystal structure of cubic NaRb5 [Fe(C2 O4 )3 ]2

Acta Crystallographica. Section E, Crystallographic Communications
O E PiroEnrique J Baran

Abstract

We show here that the phenomenon of spontaneous resolution of enanti-omers occurs during the crystallization of the sodium and rubidium double salts of the transition metal complex tris-(oxalato)ferrate(III), namely sodium penta-rubidium bis-[tris-(oxalato)ferrate(III)], NaRb5[Fe(C2O4)3]2. One enanti-omer of the salt crystallizes in the cubic space group P4332 with Z = 4 and a Flack absolute structure parameter x = -0.01 (1) and its chiral counterpart in the space group P4132 with x = -0.00 (1). All metal ions are at crystallographic special positions: the iron(III) ion is on a threefold axis, coordinated by three oxalate dianions in a propeller-like conformation. One of the two independent rubidium ions is on a twofold axis in an eightfold coordination with neighbouring oxalate oxygen atoms, and the other one on a threefold axis in a sixfold RbO6 coordination. The sodium ion is at a site of D3 point group symmetry in a trigonal-anti-prismatic NaO6 coordination.

References

Dec 21, 2002·Chemical Society Reviews·Lluïsa Pérez-García, David B Amabilino
Jun 19, 2003·Angewandte Chemie·Eugenio CoronadoJaume Veciana
May 31, 2013·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Simon ParsonsTrixie Wagner
Oct 3, 2014·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Katarzyna N JarzembskaMichał K Cyrański
Dec 30, 2014·Acta Crystallographica. Section A, Foundations and Advances·George M Sheldrick
Jan 9, 2015·Acta Crystallographica. Section C, Structural Chemistry·George M Sheldrick
Apr 7, 2016·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Colin R GroomSuzanna C Ward
Feb 1, 1999·Angewandte Chemie·Ulrich Knof, Alex von Zelewsky

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