Skip to main content
Article thumbnail
Location of Repository

Chromogenic calixarene sensors for amine detection

By C. Liu


[[abstract]]Spun films of nitrophenylazo-calix[4]arenes were investigated as gas-phase optical sensors. A red shift of the visible absorption bands was observed as these films were exposed to amine vapors. The magnitude of chromogenic effect depends on the basicity and the steric hindrance of the amine. The highest sensitivity is observed for n-hexylamine, as compared to amines with weaker basicity, e.g. n-pentylamine, n-butylamine and aniline, or amines with branched alkyl groups, e.g. dipropylamine, triethylamine, iso-pentylamine and tert-pentylamine. The chromogenic effect towards n-hexylamine also depends on substitutions on the upper and lower rims of calix[4]arene. A mechanism based on deprotonation of the azophenol group is proposed. This mechanism is consistent with experimental observations as well as results from molecular simulations. (c) 2005 Elsevier B.V. All rights reserved

Year: 2009
OAI identifier: oai:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • (external link)
  • (external link)
  • Suggested articles

    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.