Poly[[diaquatris[μ4-(p-phenylenedioxy)diacetato]dipraseodymium(III)] dihydrate

Abstract

The title praseodymium coordination polymer, {[Pr2(C10H8O6)3(H2O)2]·2H2O}n, was obtained by the hydro­thermal reaction of Pr(NO3)3 with (p-phenyl­enedi­oxy)diacetic acid in alkaline aqueous solution. Each PrIII atom is coordinated by nine O atoms, eight from four (p-phenyl­enedi­oxy)diacetate ligands and one from a water mol­ecule, displaying a tricapped trigonal prismatic geometry. There is a centre of symmetry at the mid-point of the Pr⋯Pr vector. The bridging ligands crosslink the metal ions to form a three-dimensional network, with channels running along the c axis in which the uncoordinated water mol­ecules are located. The crystal structure is stabilized by inter­molecular O—H⋯O hydrogen-bonding inter­actions.