Synthesis and structure of ammonium bis(malonato)borate

In the title salt, NH 4 + ·[B(C 3 H 2 O 4 ) 2 ] − , the boron atom is chelated by two malonate ligands in a bidentate fashion, resulting in a BO 4 tetrahedron with both chelate rings adopting shallow boat conformations. The extended structure features five N—H...O and three C—H...O hydrogen bonds, accounting for approximately 69.9% of the total intermolecular interactions.