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Diversifying hierarchical ionic assembly by docking cations to anions as salt bridges
Chem ( IF 19.1 ) Pub Date : 2024-08-06 , DOI: 10.1016/j.chempr.2024.07.005
Yusheng Chen , Devika Karolly , Anastasia Kuvayskaya , Maren Pink , Veronica Carta , Alan Sellinger , Amar H. Flood

We expand the diversity of building blocks available for ionic assembly by introducing tertiary (3°) ammonium cations into anion complexes. We use proton transfer between 3° amines and organo-phosphoric acids to generate H-bonding cations (R3NH+) and anions (RHPO4) that co-assemble with cyanostar macrocycles into assemblies with 2:2:2 stoichiometry. At the heart is a supramolecular dimer where phosphate anions form salt bridges by H-bonding with cations. Unlike conventional 4° ammonium cations, 3,000 commercial amines provide diversity for high-throughput screening of 72 combinations (9 nitrogen bases and 8 acids), producing 13 privileged partners for quantitative assembly. Yields depend on the solvent and sterics of salt bridge formation. Ten more nitrogen bases connect to fluorophores (pyrene), photocatalysts (quinoline), drugs (Cipralex, Zytiga), and ionic liquids (imidazole). The synthesis and examination of 82 new salts exemplify how acid-base chemistry can open a pipeline to a diversity of building blocks for exploring hierarchical ionic assembly.

中文翻译:


通过将阳离子对接到阴离子作为盐桥,使分层离子组装多样化



我们通过将叔 (3°) 铵阳离子引入阴离子复合物中,扩展了可用于离子组装的结构单元的多样性。我们利用 3° 胺和有机磷酸之间的质子转移生成 H 键阳离子 (R3NH+) 和阴离子 (RHPO4−),它们与 cyanostar 大环共组装成具有 2:2:2 化学计量的组装体。中心是一个超分子二聚体,其中磷酸盐阴离子通过与阳离子的 H 键形成盐桥。与传统的 4° 铵阳离子不同,3,000 种市售胺为 72 种组合(9 种氮碱和 8 种酸)的高通量筛选提供了多样性,产生了 13 种用于定量组装的特权伴侣。产量取决于盐桥形成的溶剂和空间位阻。另外 10 个氮碱基与荧光团 (芘)、光催化剂 (喹啉)、药物 (Cipralex、Zytiga) 和离子液体 (咪唑) 相连。82 种新盐的合成和检查说明了酸碱化学如何为探索分层离子组装打开通往各种构建模块的管道。
更新日期:2024-08-06
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