Selective Isolation of Polycyclic Aromatic Hydrocarbons by Self-Assembly of a Tunable N→B Clathrate
作者:Angel D. Herrera-España、Gonzalo Campillo-Alvarado、Perla Román-Bravo、Dea Herrera-Ruiz、Herbert Höpfl、Hugo Morales-Rojas
DOI:10.1021/acs.cgd.5b00219
日期:2015.4.1
The combination of one dipyridyl linker [1,2-di(4-pyridyl)ethylene (DPE), 1,2-di(4-pyridyl)ethane (DPEt), or 4,4′-azopyridine (DPA)] with two molecules of arylboronate ester 1 produced dinuclear Lewis-type N→B adducts that can act as acyclic host for polycyclic aromatic hydrocarbons (PAHs) in the solid state. Nine crystalline solids of composition PAH@adduct (i.e., one PAH per adduct) were obtained from solutions containing a single PAH. On the basis of the single-crystal X-ray diffraction analysis of the compound ANT@A1 (ANT = anthracene; A1 = adduct being composed of DPE and two boronate esters 1), the PAH inclusion selectivity is related to a size-fitting adaptation to an octaedral-shaped pocket assembled by CH-π interactions between fragments of the diamine and the arylboronate ester 1. The resulting reversible organic clathrates can perform “catch and release” cycles of PAHs such as pyrene and can sequester selectively PAHs from mixtures in solution.
一种二吡啶连接体[1,2-双(4-吡啶基)乙烯(DPE)、1,2-双(4-吡啶基)乙烷(DPEt)或4,4′-吡啶并吡啶(DPA)]与两分子芳基硼酸酯1的组合产生了双核路易斯型N→B加合物,在固态下可作为多环芳烃(PAHs)的无环宿主。从含有单一PAH的溶液中获得了九种组成PAH@加合物的晶体固体(即每个加合物对应一个PAH)。基于单晶X射线衍射分析化合物ANT@A1(ANT=蒽;A1=由DPE和两个硼酸酯1组成的加合物),PAH包合选择性与适应八面体形状的空腔的大小匹配有关,该空腔由二胺片段和芳基硼酸酯1之间的CH-π相互作用组成。由此产生的可逆有机笼型化合物可以执行“捕捉和释放”多环芳烃(如芘)的循环,并能从溶液混合物中选择性地富集PAHs。