Highly selective anion recognition and extraction is challenging and yet critical for removal of pollutants from the environment and the effective recovery of valuable chemicals from low-content (at sub-ppm or ppb level) sources. In this paper, we detail the gram-scale synthesis of a superphane 2, an anion receptor that selectively binds ReO₄⁻. Superphane 2 can extract perrhenate from solid mixtures containing traces of ReO₄⁻ anion (as low as 200 ppb) and aqueous media with near 100% selectivity over large excesses of competing anions. Meanwhile, up to 99.99% of ReO₄⁻ can be separated from complex simulated aqueous waste streams containing ppm-level perrhenate via either liquid-liquid extraction or simple column adsorption. Importantly, after extraction or adsorption, superphane 2 can be recycled and reused by simple treatment with aqueous NaHCO₃.

高度选择性的阴离子识别和提取具有挑战性，但对于从环境中去除污染物以及从低含量（亚 ppm 或 ppb 水平）来源有效回收有价值的化学物质至关重要。在本文中，我们详细介绍了 superphane 2的克级合成，这是一种选择性结合 ReO ₄ ^-的阴离子受体。Superphane 2可以从含有痕量 ReO ₄ ^-阴离子（低至 200 ppb）的固体混合物和水性介质中提取高铼酸盐，对大量过量的竞争阴离子具有接近 100% 的选择性。同时，高达 99.99% 的 ReO ₄ ^-可以通过液-液萃取或简单的柱吸附从含有 ppm 级高铼酸盐的复杂模拟废水流中分离。重要的是，在萃取或吸附后，超烷2可以通过简单的 NaHCO ₃水溶液处理进行回收和再利用。