ABSTRACT
A new supermolecular assembly crystal, [C(6)H(8)N(2)](6)H(3)[PW(12)O(40)].2H(2)O (DMB-PWA), was synthesized with phosphotungstic acid (PWA) and 1,2-diaminobenzene (DMB) under hydrothermal conditions and was characterized by Fourier-transform infrared spectra (FTIR) and single-crystal X-ray diffraction analysis. DMB-PWA could effectively catalyze oxidative degradation of chitosan with H(2)O(2) in the heterogeneous phase. The optimum degradation conditions were determined by orthogonal tests as follows: amount of chitosan 1.00 g, 30% (wt %); H(2)O(2), 3.0 mL; dosage of catalyst, 0.06 g; reaction temperature, 85 degrees C; and reaction time, 30 min. The water-soluble chitosan with a viscosity-average molecular weight (M(v)) of 4900 was obtained under the optimum degradation conditions and was characterized by FTIR, ultraviolet-visible diffuse reflection spectra (UV-vis DRS), and X-ray powder diffraction analysis.
Subject(s)
Chitosan/chemistry , Hydrogen Peroxide/chemistry , Phenylenediamines/chemistry , Phosphotungstic Acid/chemistry , Catalysis , Crystallography, X-Ray , Models, Molecular , Molecular Conformation , Molecular Weight , Oxidation-Reduction , Solubility , Spectrophotometry, Ultraviolet , Spectroscopy, Fourier Transform Infrared , Temperature , Water/chemistryABSTRACT
In the title 1:1 adduct, C(10)H(10)O(4)·C(12)H(10)N(2), the two components are linked by O-Hâ¯N hydrogen bonds to form a one-dimensional chain. The dihedral angle between the pyridine rings is 15.68â (8)° These chains are further inter-connected by weak inter-molecular C-Hâ¯O hydrogen bonds and weak C-Hâ¯π inter-actions to generate a three-dimensional network.
ABSTRACT
Chitosan was effectively degraded by hydrogen peroxide under irradiation with ultraviolet light. The existence of a synergetic effect on the degradation was demonstrated by means of viscometry. In addition, the optimal conditions of degradation were determined on the basis of orthogonal tests. The structure of the degraded product was characterized by Fourier-transform infrared spectra (FTIR) analysis and diffuse reflectance spectra (DRS) analysis. The mechanism of the degradation of chitosan was correlated with cleavage of the glycosidic bond.
