A novel inorganic–organic hybrid borate, poly{[Na2(C4H2O4)(H3BO3)(H2O)4]·H3BO3}

摘要

The structure of the title compound, catena-poly[[[di-μ-aqua-μ-fumarato-μ-(boric acid)-disodium]-di-μ-aqua] boric acid monosolvate], contains two crystallographically independent Na+ cations, each being six-coordinated by one fumarate O atom, one boric acid O atom and four water O atoms in a distorted octa­hedral geometry. Adjacent [NaO2(OH2)4] units share edges and are linked into chains propagating parallel to [100]. The free boric acid mol­ecules are connected to the chains through strong inter­molecular O—H⋯O hydrogen bonds. Additional O—H⋯O hydrogen bonds between the water mol­ecules, the free and coordinated boric acid mol­ecules and the fumarate anion lead to the formation of a three-dimensional supra­molecular structure. With the exception of the two water mol­ecules, all other atoms lie on mirror planes.