对乙酰氨基酚-水复合物中氢键作用的理论研究  被引量:1

Theoretical study on the role of hydrogen bonds in acetaminophen-water complexes

在线阅读下载全文

作  者:原媛[1,2,3] 孙乐[1,2,3] 李玉莹[1,2,3] 王晓红[1,2,3] 黄正国[1,2,3] 

机构地区:[1]天津师范大学化学学院,天津300387 [2]天津师范大学无机-有机杂化功能材料化学教育部重点实验室,天津300387 [3]天津师范大学天津市功能分子结构与性能重点实验室,天津300387

出  处:《天津师范大学学报(自然科学版)》2016年第4期39-44,共6页Journal of Tianjin Normal University:Natural Science Edition

基  金:天津市自然科学基金资助项目(12JCYBJC13400);天津市高等学校创新团队培养计划资助项目(TD12-5038)

摘  要:为了解对乙酰氨基酚(AP)在水溶液中的构象,在MP2/6-311++G(d,p)水平上研究了AP与水分子通过不同种氢键作用形成的6种AP-H2O复合物.首先分析这些复合物的几何结构、能量和振动频率,然后运用分子中原子的量子理论(QTAIM)、自然键轨道理论(NBO)和定域分子轨道-能量分解分析(LMO-EDA)等理论和方法对AP-H_2O复合物中的氢键相互作用进行定性和定量分析.研究结果表明:(1)AP分子中的—CH基团与羰基氧原子之间形成的C8H8A···O2A分子内氢键在多数AP-H_2O复合物中被保留下来;(2)AW1和AW6中的分子间氢键强于其他氢键;(3)AP的羰基氧原子是最有可能与H_2O分子形成氢键的位点,第2个最有可能与H_2O分子形成氢键的位点是AP的酚羟基,前者中H_2O是质子供体,而后者中H_2O则是质子受体;(4)AP-H_2O的形成过程中,氢键作用与结构畸变都会在一定程度上决定AP-H_2O复合物的相对稳定性,但前者的作用更大.To learn the conformation of acetaminophen in water, six acetaminophen-water (AP-H_20) complexes formed by various types of hydrogen bonds(H-bonds) were characterized by geometries, energies, vibrational frequencies at the MP2/ 6-311++G (d,p) level. Natural bond orbital (NBO), quantum theory of atoms in molecules (QTAIM) analyses and the localized molecular orbital energy decomposition analysis (LMO-EDA) were performed to explore the nature of the hydrogen bonds in these complexes. The results showed that: ( 1 ) The intramolecular H-bond C8H8^A…O2^A formed between the -CH and carbonyl oxygen atom of AP is retained in most of complexes; (2) The intermolecular H-bonds in AWl and AW6 are stronger than the other intermoleeular H-bonds ; ( 3 ) The carbonyl oxygen atom of AP is the most likely site which can form H-bond with H_20 molecule, and the second most likely site forming H-bond with H2O is the phenolic hydroxyl group of AP. Moreover, in the former case H-bonds are formed by the donation of proton from H_2O to AP, while H_2O acts as proton acceptor to form H-bond in the latter; (4) Both the hydrogen bonding interaction and structural deformation can determine the relative stabilities of AP-H_2O complexes in some degrees, but the former had more important roles than the latter.

关 键 词:对乙酰氨基酚 复合物 氢键作用 自然键轨道理论(NBO) 分子中原子的量子理论(QTAIM) 

分 类 号:O64[理学—物理化学]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象