Two 5-nitroisophthalate (NIPA) based cobalt(II) coordination polymers [Co(4-ABPT)(NIPA)(H₂O)₃], SSICG-6 (4-ABPT = 3,5-di(pyridine-4-yl)-4H-1,2,4-triazol-4-amine, SSICG stands for solid-state and inorganic chemistry group) and [Co(4-ABPT)(NIPA)(H₂O)], SSICG-7, have been synthesized using a mixed ligand approach. Strategic utilization of H₂NIPA enables tunability in framework formation and generates coordinated water containing coordination polymers. The –NO₂ group in H₂NIPA is unlikely to bind directly with metal ions but draws solvent molecules near the metal center via H-bonding. The coordinated water molecules in SSICG-6 and 7 are reversible in nature, resulting in unsaturated metal centers that serve as excellent heterogeneous catalysts in CO₂ cycloaddition and tone-pot Hantzsch condensation reactions. The near quantitative conversion of epichlorohydrin into its corresponding carbonate compound was successfully accomplished, employing SSICG-6 as a catalyst under solvent-free conditions. The unique coordination characteristics of SSICG-6 enhance its catalytic efficiency for larger substrates in CO₂ cycloaddition reactions compared to other one-dimensional polymers.

中文翻译：

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配位不饱和5-硝基间苯二甲酸钴(II)配位聚合物：高效催化CO2固定和Hantzsch缩合

两种 5-硝基间苯二甲酸 (NIPA) 基钴 ( II ) 配位聚合物 [Co(4-ABPT)(NIPA)(H ₂ O) ₃ ]，SSICG-6 (4-ABPT = 3,5-di(pyridine-4-) yl)-4 H -1,2,4-三唑-4-胺，SSICG 代表固态和无机化学基团) 和 [Co(4-ABPT)(NIPA)(H ₂ O)]，SSICG-7 ，已使用混合配体方法合成。 H ₂ NIPA的策略性利用能够实现框架形成的可调性并生成含有配位聚合物的配位水。H ₂ NIPA 中的-NO ₂基团不太可能直接与金属离子结合，而是通过氢键将溶剂分子吸引到金属中心附近。 SSICG-6和7中的配位水分子本质上是可逆的，产生不饱和金属中心，在CO ₂环加成和tone-pot Hantzsch缩合反应中充当优异的非均相催化剂。采用SSICG-6作为催化剂，在无溶剂条件下成功实现了环氧氯丙烷近乎定量地转化为其相应的碳酸酯化合物。与其他一维聚合物相比，SSICG-6独特的配位特性提高了其在CO _{2环加成反应中对较大底物的催化效率。}