Self-organised nano-arrays of p-phosphonic acid functionalised higher order calixarenes
作者:Thomas E. Clark、Mohamed Makha、Alexandre N. Sobolev、Dian Su、Henry Rohrs、Michael L. Gross、Jerry L. Atwood、Colin L. Raston
DOI:10.1039/b801256c
日期:——
Water-soluble p-phosphonic acid calix[n]arenes (n = 5, 6 or 8) have been synthesized in five steps in overall 68, 66, 67% yield, respectively, by the recently developed procedure for p-phosphonic acid calix[4]arene. The hydrogen bonding prowess of the phosphonic acids dominates their self assembly into nano-arrays in both solution and the gas phase. In DMSO, nano-arrays of p-phosphonic acid calix[6]arene are stable for over 24 h, with the solvent molecules slowly disrupting the hydrogen bonded network affording solvated monomeric units. In the gas phase, nano-arrays of around 20 calixarene units were observed for the p-phosphonic acid calix[n]arenes using MALDI-TOF-MS, and ESI-MS revealed the presence of heteroleptic nano-arrays for a 1 : 1 mixture of p-phosphonic acid calix[4,5]arenes.
通过最近开发的对膦酸钙[4]炔的合成程序,分五个步骤合成了水溶性对膦酸钙[n]炔(n = 5、6 或 8),总收率分别为 68%、66% 和 67%。膦酸的氢键能力使其在溶液和气相中都能自组装成纳米阵列。在二甲基亚砜(DMSO)中,对膦酸钙[6]炔的纳米阵列可稳定存在 24 小时以上,溶剂分子会缓慢地破坏氢键网络,产生溶解的单体单元。在气相中,使用 MALDI-TOF-MS 观察到对膦酸钙[n]炔的纳米阵列含有约 20 个钙[n]炔单元,而 ESI-MS 则显示 1 : 1 的对膦酸钙[4,5]炔混合物中存在异质纳米阵列。