Acta Cryst. (2004). E60, m1647-m1649 [ doi:10.1107/S1600536804025255 ]
Abstract: The title compound, (CH6N3)2[La(NO3)5(H2O)2], contains a network of guanidinium cations and the previously unseen diaquapentakis(nitrato)lanthanum dianion, in which 12 O atoms surround La in a distorted icosahedral arrangement. A network of N-HO and O-HO hydrogen bonds helps to consolidate the crystal packing, resulting in a three-dimensional network. The La cation, one N atom and one O atom occupy a twofold axis.
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