Yuan-Yin Chen

Upon an increase of the medium polarity, the morphology of the aggregates of calix[6]crowns TAC evolves from vesicles to the coexistence of vesicles and nanotubles, and finally to nanotubes only. Meanwhile, nanohybrids were constructed by the incorporation of caesium ions into the TAC nanotubles.

A novel conic thiacalix[4]arene derivative (1) with diagonal quinolin-8-yloxy pendants via oxyethylene spacer has been synthesized in one step. The coordination properties of the new ligand towards Ni^2 + , Co^2 +  and Zn^2 +  ions were studied by UV–vis, fluorescent spectra and ¹H NMR titration. The results showed that 1 formed very stable complexes with the three metal ions, and the stoichiometries of 1-Ni^2 + , 1-Co^2 +  and 1-Zn^2 +  were 1:1, 1:2 and 1:2, respectively.

A convenient method for preparation of thiacalix[4]arene tetraamides in high to good yields by reacting conic or 1,3‐alt‐p‐tert‐butyl‐tetrakis[(ethoxycarbonyl)methoxy]‐thiacalix[4]arene with excess monoamines or diamines is reported. In most cases, corresponding tetraamides with original conformation were obtained. However, when the cone one was reacted with ethylenediamine or propylenediamine, the obtained tetraamides possessed partial conic conformation, which meant that conversion of conformation occurred.

A new molecular clip and its two alkylated derivatives, which are soluble in most of organic solvents, were prepared from hydroxymethylated diphenylglycoluril and catechol. The structure and conformation of these new clips were studied. Their binding properties for dihydroxybenzene were also studied with the aid of ¹H NMR titration.

A new bridging reagent,N,N′-bis (chloroacetyl) propylenediamine was used to explore the relative activity and bridging pattern ofp-tert-butylcalix[4] arene,p-tert-butylcalix[6] arene and butylcalix[8] arene. It was found that the bridging reaction is selectively, at least, preferably at 1,3-position forp-tert-butylcalix [4] arene andp-tert-butylcalix[6]arene, 1,5-position forp-tert-butylcalix [8]arene. Taking the yield of bridged calixarene as a comparsion standard, the activity decreases with the increasing of the number of phenolic units in calixarene.