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| 尿酸分子互变异构体平面构象的理论研究 | |
| 引用本文： | 陈文凯,陆春海,许娇,杨迎春,李俊汉.尿酸分子互变异构体平面构象的理论研究[J].结构化学,2002,21(2):186-190. |
| 作者姓名： | 陈文凯 陆春海 许娇 杨迎春 李俊汉 |
| 作者单位： | 1. 宁波大学固体材料研究所,宁波,315211福州大学化学系,福州,350002 2. 中国工程物理研究院,绵阳,621900 3. 福州大学化学系,福州,350002 4. 四川师范学院化学系,南充,637002 |
| 基金项目： | 宁波市青年自然科学基金资助项目(9911007) |
| 摘 要： | 使用半经验量子化学中的AM1方法、从头计算Hartree-Fock理论(在3-21G*水平)和密度泛函理论中的B3LYP方法(使用6-31G(d)基组),研究了尿酸分子的所有35种互变异构体。计算结果表明,三羰基互变异构体是所有异构体中能量最低的,其次为单羟基异构体和双羟基异构体,而含有三羟基的互变异构体相对能量最高。随着羟基数的增加, C-N键的平均键长从1.395逐渐缩短到1.351,而CC键的平均键长基本保持不变(1.400~1.406)。 |
| 关 键 词： | 尿酸 互变异构 量子化学 分子结构 密度泛函理论 |
A Theoretical Study on the Tautomers of Uric Acid Molecule |
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| CHEN Wen-Kaia,b LU Chun-Haic XU Jiaob YANG Ying-Chund LI Jun-Qianb a.A Theoretical Study on the Tautomers of Uric Acid Molecule[J].Chinese Journal of Structural Chemistry,2002,21(2):186-190. | |
| Authors: | CHEN Wen-Kaia b LU Chun-Haic XU Jiaob YANG Ying-Chund LI Jun-Qianb a |
| Abstract: | Semiempirical quantum chemistry method AM1, Hartree-Fock method at 3-21G* basis set level and density functional method at B3LYP/6-31G(d) basis set level were employed to study the total 35 tautomers with planar conformational isomer of molecule uric acid. The calculated results show that the tricarbonyl tautomer is the most stable and the trihydroxy tautomer is the most unstable of all 35 tautomers, which is in agreement with the experiment. The bond lengths and bond population analysis are presented in this paper. The average CN bond lengths became shorter when the amount of hydroxy groups in tautomers increased and the average CC bond lengths had no remarkable chang in all tautomers. |
| Keywords: | uric acid tautomerism quantum chemistry density functional theory |
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