title: Redetermination of [EuCl2(H2O)6]Cl.
abstract: The crystal structure of the title compound, hexa-aqua-dichlorido-europium(III) chloride, was redetermined with modern crystallographic methods. In comparison with the previous study [Lepert et al. (1983 ▶). Aust. J. Chem. 36, 477-482], it could be shown that the atomic coordinates of some O atoms had been confused and now were corrected. Moreover, it was possible to freely refine the positions of the H atoms and thus to improve the accurracy of the crystal structure. [EuCl2(H2O)6]Cl crystallizes with the GdCl3·6H2O structure-type, exhibiting discrete [EuCl2(H2O)6](+) cations as the main building blocks. The main blocks are linked with isolated chloride anions via O-H⋯Cl hydrogen bonds into a three-dimensional framework. The Eu(3+) cation is located on a twofold rotation axis and is coordinated in the form of a Cl2O6 square anti-prism. One chloride anion coordinates directly to Eu(3+), whereas the other chloride anion, situated on a twofold rotation axis, is hydrogen bonded to six octa-hedrally arranged water mol-ecules.
authors.affiliation: Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, D-81377 München, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Tambornino
authors.affiliation: Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, D-81377 München, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Bielec
authors.affiliation: Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, D-81377 München, Germany.
authors.forename: Constantin
authors.initials: C
authors.lastname: Hoch