| Abstract: | The title complex, [BaZn(C3H2O4)2(H2O)4]n, is polymeric, due to the connectivity brought about by each malonate dianion bonding to two different ZnII cations and two different BaII cations. The BaII cations, on crystallographic twofold axes, have slightly distorted square‐antiprismic coordination, with Ba—O distances ranging from 2.795 (2) to 2.848 (2) Å. The ZnII cations, which lie on crystallographic centres of symmetry, have distorted octahedral coordination, with Zn—O bonds in the range 2.0364 (19)–2.3248 (18) Å. The water molecules participate in extensive O—H⋯O hydrogen bonding. The structure comprises alternating layers along [100], with one type containing ZnII cations and malonate dianions, while the other is primarily composed of BaII cations and water molecules. |
