Poly[[diaqua-μ3-citrato-praseodymium(III)] monohydrate]

Abstract

In the coordination polymer, {[Pr(C6H5O7)(H2O)2]·H2O}n, seven of the nine coordination sites of the monocapped square-antiprismatic geometry are occupied by three O atoms of the same citrate trianion (an O atom of the hydroxy unit and the formally single-bond O atoms from two carboxyl units). Two other coordination sites are occupied by the O atoms of a chelating carboxyl unit of another citrate; one of these atoms is additionally involved in bridging. The seventh coordination site is occupied by the O atom of the formally double-bond O atom of a neighboring citrate. The remaining two coordination sites are occupied by water molecules. The citrate functions in a μ3-bridging mode, connecting the metal atoms into a ribbon structure parallel to [010]. The structure is consolidated into a three-dimensional network by O—H...O hydrogen bonds.