Study on D-Glucosamine-Zn(Ⅱ) Complexes by IR Spectral Analysis
SUN Sheng-ling1，2, WANG Ai-qin1*, GAO Yi-ci2
1. Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China 2. Department of Chemistry, Lanzhou University, Lanzhou 730000, China
Abstract：In this paper, a series of glucosamine-Zn(Ⅱ) complexes were synthesized by the reaction of D-glucosamine hydrochloride with ZnSO4 at different pH values. The physical properties and the IR spectra of glucosamine-ZnSO4 complexes were investigated. The absorption at 3 346 and 3 292 cm-1 shifted to 3 300 cm-1 due to O—H and N—H stretching, one at 1 617 cm-1 shifted to 1 530 cm-1 due to N—H stretching, and one at 1 094 cm-1 disappeared due to secondary alcohol —OH stretching. But 1 033 cm-1 with primary alcohol —OH did not shift, suggesting that both the amino and secondary hydroxyl groups of glucosamine are coordinated to Zn(Ⅱ). The results showed that the coordination ability of Zn(Ⅱ) to glucosamine was enhanced with the pH value increasing, however, the coordination ability weakened when pH value was more than 6.5. So pH 6.5 is an optimal coordination condition for glucosamine-ZnSO4 complexes. The complexes of D-glucosamine with different zinc salts (zinc sulfate, zinc nitrate, zinc acetate, and zinc chloride) were also synthesized at the same pH value, and zinc chloride had weaker coordination ability than other zinc salts. Their IR spectra indicated that glucosamine-Zn(Ⅱ) complexes with different zinc salts had different coordination model, and only glucosamine-ZnSO4 complex had fixed ratio of coordination under the condition of pH 6.5. The structure of the complex seems to correspond to [Zn(glucosamine) ]SO47H2O at pH 6.5.
孙胜玲1，2，王爱勤1*，高忆慈2 . D-氨基葡萄糖与锌盐配位的红外光谱研究[J]. 光谱学与光谱分析, 2005, 25(03): 374-376.
SUN Sheng-ling1，2, WANG Ai-qin1*, GAO Yi-ci2 . Study on D-Glucosamine-Zn(Ⅱ) Complexes by IR Spectral Analysis . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(03): 374-376.
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