Abstract: | We present the first example of a compound containing Ba2+, C2O42?, water and some additional halide or pseudo‐halide anions, viz. hexa‐μ2‐aqua‐μ6‐oxalato‐dibarium(II) diisothiocyanate, {Ba2(C2O4)(H2O)6](NCS)2}n. The structure consists of positively charged planar covalent layers of Ba2+ cations, oxalate anions and water molecules. The first coordination sphere of the Ba2+ cation contains six water molecules and four O atoms from two planar oxalate anions. The oxalate anion lies on an inversion centre and is coordinated to six Ba2+ cations, each donor O atom being bonded to two cations. Pairs of water molecules are coordinated by two Ba2+ cations. The layers are interspersed with non‐coordinated NCS? anions. |