摘要
研究了不同 pH值下 ,D- 氨基葡萄糖与硫酸锌的配位情况。随着 pH值的逐渐增大 ,氨基葡萄糖与金属锌离子的配位能力越来越强 ,pH 6 . 5时D- 氨基葡萄糖与硫酸锌有最大配位比 ,其配比为 1∶1。同时还合成了氨基葡萄糖与不同锌盐的配合物 ,通过旋光度、摩尔电导、锌含量和IR的分析 ,表明在相同条件下 ,不同锌盐与氨基葡萄糖形成的配合物 ,其配位方式不同。
In this paper, a series of glucosamine-Zn(Ⅱ) complexes were synthesized by the reaction of D-glucosamine hydrochloride with ZnSO_4 at different pH values. The physical properties and the IR spectra of glucosamine-ZnSO_4 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- ZnSO_4 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-ZnSO_4 complex had fixed ratio of coordination under the condition of pH 6.5. The structure of the complex seems to correspond to [Zn(glucosamine) ]SO_47H_2O at pH 6.5.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2005年第3期374-376,共3页
Spectroscopy and Spectral Analysis
基金
甘肃省自然科学基金 (ZS0 2 1 A2 5 0 1 0 8)资助项目
