Surface acoustic wave sensing of linear alcohols using para-acylcalix[n]arenes

Abstract

para-Hexanoylcalix[4, 6 or 8]arenes have been used as surface acoustic wave sensor capture layers showing a high efficiency for the detection of linear alcohols, with high reproducibility and rapid response times.

Structural characterization of inclusion complexes of para-sulphonato-calix[8]arene with 1,2-bis(4-pyridyl)-ethane and 1,3-bis(4-pyridyl)-propane. New ‘double cone’ and ‘up–flat–down’ conformations of para-sulphonato-calix[8]arene

“…17 It is has been observed that in many of the solid-state complexes of calix [8]arenes, for example that with the butane diammonium cations, channels capable of taking up gases or volatile organic compounds are available. 18 Such behaviour has been observed for para-phosphonato-calix [8]arene-O-alkyl ethers with regard to linear alcohols. 19 In this paper we describe the solid state structures of the complexes of para-sulphonato-calix [8]arene, C8S, with two flexible ligands 1,2-bis(4-pyridyl)-ethane (BPE) and 1,3bis(4-pyridyl)-propane (BPP).…”

“…Sorption experiments were performed in the case of the C8S-BPE salt and they have shown that indeed in the solid state the complex is capable of taking up organic gas molecules, in this case propane, using the methodology previously used by ourselves to measure alcohol uptake by amphiphilic calix[n]arenes. 18 The results are shown in Fig. 11 below, the frequency response is of the order 100 Hz and is clearly reproducible over a number of vacuum-gas cycles.…”