The crystal structure of
the title compound [EuCl2(OH2)2]Cl ('europium trichloride hexahydrate') has
been redetermined from single-crystal diffractometer
data at 295 K and refined to a residual of 0.040 for 1094 independent
'observed' reflections. Crystals are monoclinic, P2/n, a 9.659(3), b 6.529(2), c 7.936(4) �, β 93.67(4)�, Z 2. The europium atom lies on a
crystallographic twofold axis, which passes between the two planes of a square-antiprismatic coordination environment in which the two
chlorine atoms, on opposite faces, lie cis
to each other. Eu-O distances range from 2.401(6) to
2.431(5) �; Eu-Cl is 2.774(2) �.