The crystal structures of two neodymium(iii) complexes with pyridine‐2, 6‐dicarboxylic acid

Abstract

The structures of two complexes of neodymium(III) with pvndine-2.6-dicarboxvlic acid of formula (NH4), [Nd(C7H3NO4)3]-7H2O (1) and (NH4)[Nd3(C7H3NO4)5 8H2O]-5H2O (2) have been determined by X-ray diffraction. Crystals of 1 are monoclinic, P21/c, a = 17.925(4). b = 10.198(2), c = 18.707(4) Å, β = 112.22(3)°. Z = 4. Crystals of 2 are monoclinic C2/c, a = 22.205(4), b = 13.774(3), c = 17.783(4) Å, β = 112.55(3)°, Z = 4. Both structures were solved by the heavy-atom method and refined to R = 0.032 for 7568 reflections (1) and 0.030 for 3267 reflections (2). The water molecules and NH+ 4 groups in both crystals participate in a network of hydrogen bonds.