writer：Liao, B; Liu, RG; Huang, Y
keywords：supramolecular chirality; chitosan; chiroptical switch; porphyrin
source：期刊
specific source：Polymer Journal 2007, 39(10), 1071-1077
Issue time：2007年

A supramolecular chiroptical switch based on chitosan and tetrakis (4-sulfonatophenyl) porphine (TPPS) complex films was prepared. The reversible changes of the chirality of the complex films were studied by UV-vis and circular dichroism (CD) spectra. It was found that the chirality of the complex films can be wiped off by being exposed to NH3 gas and subsequently recovered by being exposed to moist HCl gas. The complex film is stable and can stand at least 20 cycles of the switching to NH3 and HCl gases. There is no change in the above properties after the complex films were store in the air at room temperature.