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.
Multifunctional water-soluble molecular capsules based on p-phosphonic acid calix[5]arene
作者:Adam D. Martin、Ramiz A. Boulos、Lee J. Hubble、Karel J. Hartlieb、Colin L. Raston
DOI:10.1039/c1cc11991e
日期:——
p-Phosphonic acid calix[5]arene forms molecular capsules in water based on two of the molecules, which can be loaded with carboplatin using intense shearing, and attached to single wall carbon nano-tubes. Spin coating of the capsules onto a substrate affords 2 nm fibres of stacked calixarenes, with the self-assembly understood using molecular modelling.