Four new praseodymium(III) metal–organic compounds varying in dimensionality from 0D to 3D have been designed and synthesized based on N‐heterocyclic polycarboxylic acids, including pyridine‐2,6‐dicarboxylic acid (H₂pydc) and pyrazine‐2,3‐dicarboxylic acid (H₂pzdc). Altering the concentration of piperazine (pip, ancillary ligand) enables control over the dimensionality of the compound by switching between the 0D [H₂pip][Hpip][Pr(pydc)₃]·4H₂O (I) and the 1D {[Pr(pydc)(Hpydc)(H₂O)₂]·4H₂O}_n (II) coordination polymer (CP). Upon replacing H₂pydc with H₂pzdc, CP II is converted to the 2D CP [Pr(pzdc)(Hpzdc)(H₂O)₃]_n (III) and using the metalloligand [Zn(Hpzdc)₂(H₂O)₂]²⁻, the 3D heterometallic CP {[Pr₂Zn(pzdc)₄(H₂O)₆]·2H₂O}_n (IV) is formed. Compound IV shows high stability in the absence of uncoordinated solvent molecules and is stable up to 400°C, even in the presence of humidity. Therefore, IV was utilized for iodine adsorption in the vapour phase and in the presence of humidity. The results confirm the remarkable potential of IV for reversible adsorption of iodine vapour.

中文翻译：

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0D至3D PrIII金属-有机网络晶体设计，可实现最佳的碘吸附

基于N-杂环多元羧酸，包括吡啶-2,6-二羧酸（H ₂ pydc）和吡嗪-2,3 ，设计并合成了四种尺寸从0D到3D不等的新型new金属金属化合物。-二羧酸（H ₂ pzdc）。通过更改0D [H ₂ pip] [Hpip] [Pr（pydc）₃ ]·4H ₂ O（I）和1D { [Pr（pydc）（Hpydc）（H ₂ O）₂ ]·4H ₂ O} _n（II）配位聚合物（CP）。更换H _2时带有H ₂ pzdc的pydc，将CP II转换为2D CP [Pr（pzdc）（Hpzdc）（H ₂ O）₃ ] _n（III）并使用金属配体[Zn（Hpzdc）₂（H ₂ O）₂ ]参照图^2-，形成3D异金属CP {[Pr ₂ Zn（pzdc）₄（H ₂ O）₆ ]·2H ₂ O} _n（IV）。化合物IV在不存在未配位的溶剂分子的情况下显示出高稳定性，即使在有湿气的情况下，其在高达400°C的温度下仍稳定。因此，IV在气相中和在湿气存在下，将其用于碘吸附。结果证实了IV具有可逆吸附碘蒸气的巨大潜力。