Tetranitro-oxacalix[4]crown-Based Host–Guest Recognition Motif and a Related [2]Rotaxane-Based Molecular Switch
作者:Hua Liu、Wen-Jing Hu、Yahu A. Liu、Jiu-Sheng Li、Biao Jiang、Ke Wen
DOI:10.1021/acs.joc.6b01082
日期:2016.8.5
supramolecular complex. Furthermore, on the basis of a [2]pseudorotaxane complex formed from a tetranitro-oxacalix[4]crown and an axle containing a secondary ammonium ion and a urea group, a [2]rotaxane-based molecular switch was created, in which the oxacalix[4]crown wheel was able to reversibly translocate between the secondary ammonium binding site and the urea binding site of the axle under acid–base stimulation
与迄今为止报道的基于oxacalix [4] crown的宿主-客体基序不同,在oxacalix [4] crown的宿主-客体基序中,oxacalix [4] crown仅充当氢键受体,而[2]-假轮烷烷型四硝基-oxacalix [4] crown /尿素宿主-客体识别开发了基序,其中四硝基-oxacalix [4]冠既充当氢键供体,又充当稳定所得超分子复合物的受体。此外,基于由四硝基-氧杂acalix [4]冠和含有仲铵离子和脲基的轴形成的[2]假轮烷复合物,创建了基于[2]轮烷的分子开关,其中oxacalix [4]冠轮在酸碱刺激下能够可逆地在轴的次级铵结合位点和尿素结合位点之间移位。