A water-stable metal-organic framework material of [Cd₂ (pbdc)(H₂O)₃](1) has been synthesized based on H₄pbdc (H₄pbdc = 5-phosphonobenzene-1,3-dicarboxylic acid) ligands and Cd²⁺ ions. The Cd²⁺ ions are interacted with phosphonate and carboxylate groups to form infinitely extending one-dimensional chains, which are then bridged by pbdc ligands to generate a three-dimensional structure. AC impedance study found that the proton conductivity of compound 1 is 2.32 10⁻⁴ Scm⁻¹ at 333 K and 98% RH. Many MOF-polymer composite materials have excellent properties (such as heat resistance, high proton conductivity, etc.) and can be used in fuel cells and other fields. Thus, compound 1 was added to the CS matrix to prepare a series of composite membrane 1@CS-X (X = 1%, 3%, 5%, and 7% wt), which have good thermal stability and high proton conductivity. Under the same conditions, the effects of the 1@CS-X composite membranes on proton conduction are better than that of 1, which is caused by the hydrogen bond network constructed between CS and 1, and that provides a continuous channel for proton transfer. Strikingly, the proton conduction value of 1@CS-3 reached 1.10 10⁻² Scm ⁻¹ 353 K and 98% RH, which is much better than many recently reported MOF-polymer composites.

[Cd ₂ (pbdc)(H ₂ O) ₃ ]( 1 )的水稳定金属有机骨架材料已基于 H ₄ pbdc (H ₄ pbdc = 5-膦酰基苯-1,3-二羧酸) 合成配体和 Cd ²⁺离子。Cd ²⁺离子与膦酸盐和羧酸盐基团相互作用，形成无限延伸的一维链，然后由 pbdc 配体桥接形成三维结构。交流阻抗研究发现化合物1的质子电导率为2.32 10 ^-4 Scm ^-1在 333 K 和 98% RH 下。许多MOF-聚合物复合材料具有优异的性能（如耐热性、高质子传导性等），可用于燃料电池等领域。因此，将化合物1添加到 CS 基质中制备了一系列复合膜1 @CS-X（X = 1%、3%、5% 和 7% wt），具有良好的热稳定性和高质子传导性。在相同条件下，1 @CS-X复合膜对质子传导的影响优于1，这是由于CS和1之间构建了氢键网络，为质子传递提供了连续通道。引人注目的是，质子传导值为1@CS-3 达到 1.10 10 ^-2 Scm ^-1 353 K 和 98% RH，比许多最近报道的 MOF 聚合物复合材料要好得多。