QCM Coated with Self-assembled Cystine-bearing 1,3-Bridged Calix[4]arenes for Recognizing Gas-phase Butylamines

Autor: Chen Lang-Xing, Yin Hong-Zong, Li Yuan-Yuan, He Jia-Qi, He Xi-Wen, Zhang Guo-Zhu
Rok vydání: 2005
Předmět:
Zdroj: Chinese Journal of Chemistry. 23:571-575
ISSN: 1614-7065
1001-604X
DOI: 10.1002/cjoc.200590571
Popis: Two cystine-bearing 1,3-bridged calix[4]arenes were used as the coatings of the quartz crystal microbalance (QCM) with gold electrodes. The two calix[4]arene derivatives were self-assembled onto the gold electrode surface by the covalent attachment between the di-sulfur and gold. The compound of cystine-bearing bi-phenylalanine 1,3-bridged calix[4]arene (CPC) with longer alkyl chain had better self-assembled capacity onto the fresh surfaces of gold electrode than that of cystine-bearing 1,3-bridged calix[4]arene (CC) with comparably shorter alkyl chain. The modified QCM sensors were used to recognize the butylamine isomers in gas. The results showed that the QCM coated with both compounds had preferential affinity to n-butylamine, then i-butylamine, t-butylamine in the range of low concentrations, indicating that in the recognition process, the steric hindrance effect played an important role when forming complex with guest molecules. When the concentrations of the analytes were increased, the polarity and the magnetism of the butylamine became determinative factors. The reversibility was improved greatly and the equilibrium time was much shorter on the self-assembled film than on the film obtained by dropping coating.
Databáze: OpenAIRE
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