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Spiropyran–Amidine: A Molecular Canary for Visual Detection of Carbon Dioxide Gas
Author(s) -
Darwish Tamim A.,
Evans Richard A.,
James Michael,
Hanley Tracey L.
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201101723
Subject(s) - sparging , spiropyran , inert gas , carbon dioxide , aqueous solution , amidine , chemistry , computer science , molecule , organic chemistry
Molecular canary : Spiropyran substituted with an amidine group (SP–Am; see scheme) is a sensitive reversible colorimetric CO 2 probe and can function as a molecular canary. Aqueous alcohol solutions containing Sp–Am are purple and on addition of low levels of CO 2 gas become yellow. The purple colour is rapidly recovered when CO 2 is removed from the solution by inert gas or air sparging, or slowly when allowed to stand uncovered.