Polymers formed between three ligands and selected metal ions were prepared and their thermal stability in air was investigated. 1,5-Dihydroxynaphthalene-2,6-dicarboxylic acid (1,5-N-2,6) formed coordination polymers with Zn, Ni, Al, and Fe⁺³. Zn-1,5-N-2,6 was more stable than the corresponding Fe and Ni polymers. Pyromellitic acid (PMA) formed coordination polymers of high molecular weight with Th and U⁺⁴. The Th-PMA was stable up to 405°C., while the corresponding uranium compound decomposed below 400°C. The coordination polymer of 2,3,6,7-naphthalenetetracarboxylic acid (NT) with Th was less stable (decomposition temperature: 360°C.) than the corresponding pyromellitic polymer because the coordination of Th in Th-NT was partially accomplished by water molecules rather than carboxylic oxygens as in the Th-PMA polymer. The thermal stability of these polymers was a function of the metal involved in coordination. Higher thermal stability resulted when Zn or Th were used than if metals capable of changing their ionic valency were involved in polymer formation.

中文翻译：

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配位聚合物的热稳定性

制备了在三个配体和选定的金属离子之间形成的聚合物，并研究了它们在空气中的热稳定性。1,5-二羟基萘-2,6-二羧酸（1,5-N-2,6）与Zn，Ni，Al和Fe ⁺³形成配位聚合物。Zn-1,5-N-2,6比相应的Fe和Ni聚合物更稳定。均苯四酸（PMA）形成具有Th和U ^+4的高分子量配位聚合物。Th-PMA在高达405°C的温度下稳定，而相应的铀化合物在400°C以下分解。2,3,6,7-萘四甲酸（NT）与Th的配位聚合物比相应的均苯四酸聚合物不稳定（分解温度：360°C），因为Th-NT中Th的配位部分是由水完成的分子而不是Th-PMA聚合物中的羧基氧。这些聚合物的热稳定性是参与配位的金属的函数。当使用Zn或Th时，相比于能够改变其离子化合价的金属参与聚合物的形成，其热稳定性更高。