Three cadmium phosphonate coordinated polymers, namely as [Cd₅(ptz)₃(SO₄)₂(5H₂O)]·6H₂O (Cdptz-1), [Cd₃(ptz)₂(Cl)₂(4H₂O)]·2H₂O (Cdptz-2) and [Cd₄(ptz)₂(SO₄)(Cl)(OH)H₂O]·H₂O (Cdptz-3) have been hydrothermally synthesized using 4-(1,2,4-triazol-4-yl)phenylphosphonic acid (H₂ptz) as ligand. Single crystal X-ray analyses revealed Cdptz-2 as layered structure and Cdptz-1,3 as pillar-layered structures with Cl^- or SO₄^2- as bridging anions. Due to the weak bonding between metal and anions, Cdptz-1 and 2 can reversibly convert into each other by simple immersing in the corresponding solution at room temperature. While the transformations between Cdptz-1,2 and Cdptz-3 can only happen under hydrothermal condition. The causes for the transformation involve the metal-ligand bond breaking/formation, replacement of anions and enhancement/decrement of the network dimensionality.

三种膦酸镉配位聚合物，即[Cd ₅（ptz）₃（SO ₄）₂（5H ₂ O）]·6H ₂ O（Cdptz-1），[Cd ₃（ptz）₂（Cl）₂（4H _2） [O）]·2H ₂ O（Cdptz-2）和[Cd ₄（ptz）₂（SO ₄）（Cl）（OH）H ₂ O]·H ₂ O（Cdptz-3）的合成是使用4- （1,2,4-三唑-4-基）苯基膦酸（H ₂ ptz）作为配体。单晶X射线分析显示Cdptz-2作为层状结构和Cdptz -1,3-为支柱层状结构的有Cl ^-或SO ₄ ^2-作为桥接阴离子。由于金属和阴离子之间的键合较弱，因此Cdptz-1和2可以通过在室温下简单地浸入相应的溶液中而可逆地相互转化。虽然Cdptz-1,2和Cdptz-3之间的转换只能在水热条件下发生。转变的原因包括金属-配体键的断裂/形成，阴离子的置换和网络维数的增强/下降。