Poly[hexaaquabis(μ₄-pyrimidine-4,6-dicarboxylato)tetralithium]

Abstract

The asymmetric unit of the title compound, [Li4(C6H2N2O4)2(H2O)6]n, comprises two Li+ ions bridged by a completely deprotonated pyrimidine-3,6-dicarboxyl­ate ligand and coordinated by two water mol­ecules; the asymmetric units related by an inversion operation create a structural unit which forms part of a two-dimensional polymeric structure parallel to (10-1). One of the Li+ ions shows a distorted tetra­hedral arrangement involving two symmetry-related coordinating water mol­ecules and two carboxyl­ate O atoms. The other Li+ ion is in distorted trigonal–bipyramidal geometry defined by N and O atoms of the ligands and a water mol­ecule. Water O atoms are proton donors to carboxyl­ate O atoms forming hydrogen bonds.