Design and Synthesis of a More Highly Selective Ammonium Ionophore Than Nonactin and Its Application as an Ion-Sensing Component for an Ion-Selective Electrode
作者:Koji Suzuki、Dwi Siswanta、Takeshi Otsuka、Tsuyoshi Amano、Takafumi Ikeda、Hideaki Hisamoto、Ryoko Yoshihara、Shigeru Ohba
DOI:10.1021/ac9911241
日期:2000.5.1
A novel ammonium ionophore, which exhibits superior NH4+ selectivity compared with that of the natural antibiotic nonactin, was successfully designed and synthesized based on a 19-membered crown compound (TD19C6) having three decalino subunits in the macrocyclic system. This bulky decalino subunit is effective for (1) increasing the structural rigidity of the cyclic compound, (2) introducing the "block-wall
基于在大环系统中具有三个十氢萘基亚基的19元冠化合物(TD19C6),成功设计和合成了一种新型铵离子载体,该铵离子载体具有比天然抗生素nonactin更高的NH4 +选择性。这种庞大的十氢化萘亚基可有效用于(1)提高环状化合物的结构刚性,(2)引入“阻隔壁效应”,防止形成具有较大离子的复合物,以及(3)提高环糊精的亲脂性离子载体分子。在铵离子载体设计中,相对于较小的离子(如Li +,Na +或什至最接近的尺寸K +),第一个因素有助于提高NH4 +的选择性,第二个因素则相对于较大的离子(如Rb +和Cs +)增加NH4 +的选择性。X射线结构分析证明TD19C6在其冠环腔中与NH4 +形成了一个大小适合的配合物。作为该离子载体的应用,制备了一种离子传感器(离子选择电极),其NH4 +对K +的选择性和Na +的选择性分别为10倍和3,000倍。与基于非肌动蛋白的电极相比,该电极表现出更好的