Aza-macrocycles bearing lipophilic functions. Their synthesis and selective lithium complexation
作者:Andrea Bencini、Vieri Fusi、Claudia Giorgi、Mauro Micheloni、Nicoletta Nardi、Barbara Valtancoli
DOI:10.1039/p29960002297
日期:——
aqueous solution, while the other alkali metal ions are not complexed. Lithium complexation is achieved through the encapsulation of the metal ion into the cavity of the macrobicycle. The remarkable selectivity is due to the small dimension of the macrobicyclic cavity, in which only Li+ can be lodged. The stability constants of the lithium complexes have been determined in water and in water-DMSO mixture
新颖macrobicyclic配体的合成4 4,9-二甲基-4- 1,4,7,9 -tetraaza-1(1,4)-benzena-4(1,7)-cyclododecanacyclohexaphane(L2)和5-十二烷基据报道有12,17-二甲基-1,5,9,12,17-五氮杂双环[7.5.5]十八碳烯(L3)。L2的质子化常数,与那些macrobicycles L4和L5的一起,无论是在水和在水中DMSO混合物被确定电位滴定(80:20,V / V,氯化钠0.15摩尔分米-3,298.1 K)。已通过13 C和7 Li NMR技术研究了这些大二环与Li +的配位。所有配体结合Li +在水溶液中,而其他碱金属离子则不被络合。锂的络合是通过将金属离子封装到大自行车的空腔中来实现的。显着的选择性归因于大双环腔的小尺寸,其中只有Li +可以嵌入其中。锂络合物的稳定常数已通过电位测量法在水中和在水与DMSO混合物(80:20,v