纸质出版日期:2000-6-20
扫 描 看 全 文
引用本文
阅读全文PDF
在均相条件下 ,通过甲壳胺 (CTS)与CuSO4 反应合成了甲壳胺 Cu(Ⅱ )配合物 ,并用元素分析、IR、X 衍射和TGA对Cu(Ⅱ )与甲壳胺形成的配合物进行了结构表征 .不同pH值下形成的配合物有不同的构型 .在pH =7时配合物是由 1个Cu(Ⅱ )与 1个甲壳胺单元中C2 和C3 位上的—NH2 和—OH进行配合并通过羟基形成了桥式配位结构 .
The complex formation between Cu(Ⅱ) and chitosan was studied in aqueous solution at different pH values.The composition and structure of chitosan-Cu(Ⅱ) complexes were characterized by elemental analysis,infrared spectra,thermograms and X-ray diffraction.The ratios of glucosamine residue of chitosan molecule to Cu(Ⅱ) are 8∶3,4∶3 and 1∶1 at pH=5,6 and 7, respectively.The results of IR spectra indicated that the —NH2 and —OH of the secondary alcohol of chitosan molecules are coordinated to Cu(Ⅱ). New peaks at 555,532 and 551,551cm-1 appear in the chitosan-Cu(Ⅱ) complexes at pH=6 and 7,respectively.The absorption at 550cm-1 si suggested to be the asymmetric Cu-O vibration and absorption at 511cm-1 could be related to hydroxy-bridged compounds.The marked difference of X-ray diffraction patterns between the chitosan and its complexes indicated thaat the coordination of chitosan to Cu(Ⅱ) could be correlated with the conformation change of chitosan molecules at pH=6 and 7.Chitosan has three steps in the thermal weight loss process,but the complexes have four steps.Considering chitosan being a linear truck poolysaccharide of anti-appeal arrangement,together with its other physical properties,such as solubility and crystallinity,it can be concluded that the complexes of chitosan with Cu(Ⅱ) in the dilute formic acid solution of pH=7have the hydroxy-bridged structure.
0
浏览量
9
下载量
0
CSCD
相关文章
相关作者
相关机构