Synthesis and lithium ion selectivity of 14-crown-4 derivatives having bulky subunits: cis and trans isomers of 2-phenylcyclohexano-14-crown-4, 2,3-diphenylcyclohexano-14-crown-4 and 2,3-di-(1-adamantyl)-14-crown-4
作者:Yoshito Tobe、Yuko Tsuchiya、Hidekazu Iketani、Koichiro Naemura、Kazuya Kobiro、Mayumi Kaji、Sachiko Tsuzuki、Koji Suzuki
DOI:10.1039/a706606f
日期:——
cis- and trans-2-Phenylcyclohexano-14-crown-4, cis- and trans-2,3-diphenylcyclohexano-14-crown-4, and cis- and trans-2,3-di-(1-adamantyl)-14-crown-4 have been prepared and their ion selectivities toward alkali metal cations examined by means of the extraction of alkali metal picrates, the measurement of stability constants of the complexes with lithium or sodium perchlorate, and the electrode response potential measurement for the ion-sensitive membranes. The remarkable dependence of the complexation ability to Li+ on the cis/trans stereochemistry of the ionophores is discussed on the basis of their geometries estimated by molecular mechanics calculations and the structures of cis- and trans-diphenylcyclohexano derivatives determined by X-ray structure analyses. In order to assist the discussion, the X-ray structure analyses of the lithium picrate complex of decalino-14-crown-4 and the 2∶1 ‘sandwich-type’ complex of benzo-14-crown-4 with sodium perchlorate have also been undertaken.
顺-和反-2-苯基环己基-14-冠-4、顺-和反-2,3-二苯基环己基-14-冠-4、以及顺-和反-2,3-二-(1-金刚烷基)-制备了14-crown-4,并通过碱金属苦味酸盐的萃取、与高氯酸锂或钠的配合物的稳定常数的测量以及离子的电极响应电位测量来检查其对碱金属阳离子的离子选择性-敏感膜。根据分子力学计算估计的几何形状以及 X 射线结构分析确定的顺式和反式二苯基环己基衍生物的结构,讨论了 Li + 的络合能力对离子载体顺式/反式立体化学的显着依赖性。为了辅助讨论,还对苦味酸锂decalino-14-crown-4配合物和苯并14-crown-4与高氯酸钠的2∶1“三明治型”配合物进行了X射线结构分析。已进行。