NMR and FT-IR Analysis of New Molecular Complex 1-Piperidine-carboxylate-Piperidinium-H_2O

作     者：JIANG Huiming ZHANG Shubiao JIN Rongchao 

作者机构：College of Life Science Dalian Nationalities University Dalian 116600 Liaoning China Department of Chemistry Carnegie Mellon University Pittsburgh PA 15213 USA 

出 版 物：《Wuhan University Journal of Natural Sciences》 (武汉大学学报（自然科学英文版）)

年 卷 期：2008年第13卷第1期

页      面：93-97页

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：Supported by Project of Education Department of Liaoning Province (20040084) 

主　　题：piperidine molecular complex NMR FT-IR hydrogen bond electron transfer 

摘      要：Piperidine absorbs CO2 and H2O contents in air to form a molecular complex： piperidium-1-piperidinecarboxylate-H2O. The structure of the complex was characterized by FT-IR and NMR. The complex is stabilized via five hydrogen bonds between the three components, N…O electrostatic interaction and O…O interaction （electron transfer） betweenl-piperidinecarboxylate and H2O. Through electron transfer from the carbamate ion, the oxygen atom in water molecule is strongly negatively charged and the O-H bond is considerably shorter than that of free water molecule. The formation of the molecular complex is a reversible process and will decompose upon heating. The mechanism of formation and stabilization is further investigated herein.