The asymmetric unit in the structure of the title compound, [K2(C9H4O9S)(H2O)2]n, consists of two eight-coordinated KIcations, one 2,4-dicarboxy-5-sulfonatobenzoate dianion (H2SBTC2−), one bridging water molecule and one terminal coordinated water molecule. One KIcation is coordinated by three carboxylate O atoms and three sulfonate O atoms from four H2SBTC2−ligands and by two bridging water molecules. The second KIcation is coordinated by four sulfonate O atoms and three carboxylate O atoms from five H2SBTC2−ligands and by one terminal coordinated water molecule. The KIcations are linked by sulfonate groups to give a one-dimensional inorganic chain with cage-like K4(SO3)2repeat units. These one-dimensional chains are bridged by one of the carboxylic acid groups of the H2SBTC2−ligand to form a two-dimensional layer, and these layers are further linked by the remaining carboxylate groups and the benzene rings of the H2SBTC2−ligands to generate a three-dimensional framework. The compound displays a photoluminescent emission at 460 nm upon excitation at 358 nm. In addition, the thermal stability of the title compound has been studied.
标题化合物[K2(C9H4O9S)(H2O)2]n结构中的不对称单元由两个八配位的KI阳离子、一个2,4-二羧基-5-磺酸基苯甲酸二离子(H2SBTC2-)、一个桥接水分子和一个末端配位水分子组成。一个 KIcation 由四个 H2SBTC2 配体的三个羧酸 O 原子和三个磺酸 O 原子以及两个桥接水分子配位。第二个阳离子由五个 H2SBTC2 配体的四个磺酸 O 原子和三个羧酸 O 原子以及一个末端配位水分子配位。KI阳离子通过磺酸盐基团连接,形成一条带有笼状 K4(SO3)2 重复单元的一维无机链。这些一维链由 H2SBTC2 配体的一个羧酸基团桥接,形成一个二维层,这些二维层又由 H2SBTC2 配体的其余羧酸基团和苯环进一步连接,形成一个三维框架。在 358 纳米波长的激发下,该化合物在 460 纳米波长处发出光致发光。此外,还研究了标题化合物的热稳定性。