Chiroptical Properties of Chitosan Bearing Benzoyl Choromophores in Formic Solutions

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Abstract Benzoylchitosan and p-chlorobenzoylchitosan bearing choromophores were prepared in methane sulfonic acid system by chitosan with benzoyl chloride and p-chlorobenzoyl chloride respectively.The expected molecular structures of benzoylchitosan and p-chlorobenzoyl chitosan were confirmed by UV-Visible spectrometer.Benzoylchtosan has absorbance band at wavelength of 254 nm corresponding to benzoyl group.p-Chlorobenzoyl chitosan has absorbance band at wavelength of 258 nm corresponding to p-chlorobenzoyl group.For benzoylchitosan at 250 mg/L,splitting CD signals(a positive one and a negative one) centered to 254 nm corresponding to benzoyl group transition were observed. For p-chlorobenzoyl chitosan at 250 mg/L,splitting CD signals(a positive one and a negative one) centered to 258 nm corresponding to p-chlorobenzoyl group transition were observed.The results showed benzoyl and p-chlorobenzoyl groups were orderly arranged along the helical polymer chain of chitosan,and helix adopts left-handed helical conformations.p-Chlorobenzoyl choromophore was more suitable than benzoyl choromophore to study the conformational property of chitosan in formic acid.The helicities of benzoylchitosan and p-chlorobenzoyl chitosan are sensitive to environment temperature.

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Received 2009-09-15; published 2009-09-15

Cite this article:

WANG Li-xia.Chiroptical Properties of Chitosan Bearing Benzoyl Choromophores in Formic Solutions[J] Chemcial Industry and Engineering, 2009,V26(5): 409-413

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