This study evaluates the supramolecular reactivity of the title tetracarboxylic ligand (NTCA), targeting the synthesis of hybrid organic–inorganic polymeric assemblies with the aid of metal–ligand coordination synthons. In the experimental conditions used, all reactions of the corresponding 2+ metal ions with NTCA were associated with a complete de-protonation of this ligand to its tetra-anionic form, naphthalene-1,4,5,8-tetracarboxylate (NTC), and a 2 : 1 metal : NTC stoichiometry in the resulting materials. The latter represent either hybrid coordination polymers of diverse and a priori unpredictable connectivity schemes (with Cu^II, Ni^II and Co^II as connectors), or discrete NTC complexes with the nickel and cobalt ions. The formed polymeric arrays are of 1D or 2D nature. Based on the empirical observations, it appears that due to the high affinity of these transition metal ions for competing ligands from the solvent (e.g., water and pyridine) and the biased uni-directional disposition of the carboxylate groups on the molecular framework of NTC, the potential utility of the latter in a designed construction of spatially extended coordination frameworks is not very promising.

中文翻译：

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萘-1,4,5,8-四羧酸对过渡金属离子的超分子反应性：配位聚合物和与Cu ^II，Ni ^II和Co ^II的离散络合物†

这项研究评估了标题四羧酸配体（NTCA）的超分子反应性，其目标是借助金属-配体配位合成子来合成有机-无机杂化聚合物组装体。在所用的实验条件下，相应2+金属离子与NTCA的所有反应均与该配体的完全脱质子化为其四阴离子形式萘-1,4,5,8-四羧酸盐（NTC），所得材料中金属和NTC的化学计量比为2∶1。后者代表不同的和先验的不可预测的连通性方案（具有Cu ^II，Ni ^II和Co ^II的杂化配位聚合物）作为连接器），或与镍和钴离子分离的NTC络合物。所形成的聚合物阵列具有1D或2D性质。根据经验观察，似乎由于这些过渡金属离子对来自溶剂的竞争性配体具有很高的亲和力（例如，水 和 吡啶）以及NTC分子框架上羧酸酯基团的偏向单向配置，后者在空间扩展配位框架的设计构建中的潜在用途不是很有希望。