Multi-component Hydrogen-bonding Organic Salts Formed from 1-Methylpiperazine with Aromatic Carboxylic Acids： Synthons Cooperation and Crystal Structures  

作　　者：YANG Yu XU Wenyan HU Yanjing WANG Lei HUANG Keke 

机构地区：[1]Key Laboratory of Eco-chemical Engineering, Ministry of Education, Laboratory of Inorganic Synthesis and Applied Chemistry, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China [2]State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, P R. China

出　　处：《Chemical Research in Chinese Universities》2015年第1期9-15,共7页高等学校化学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China（Nos.51372125, 21203106）, the Fund of the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, China（No.2013-34）, and the Scientific and Technical Development Project of Qingdao City, China（No. 13-1-4-184-jch）.

摘　　要：1-Methylpiperazine was employed to crystallize with 2,4-dihydroxybenzoic acid and 1,8-naphthalene acid, affording two multi-component hydrogen-bonding salts [（C5H14N2）^2＋-（C7H5O4）2^·H2O]（1） and [（C5H14N2）^2＋（C12H6O4）^2-.2H2O]（2）. These two forms of salts are both monoclinic systems with space group P21/c（14）. The lattice parameters of salts 1 and 2 are a=1.32666（10） nm, b=0.90527（7） nm, c=1.67107（13） nm, β=103.125（1）° and a=1.4950（2） nm, b=0.75242（15） nm, c=1.6563（3） nm, β=92.834（2）°, respectively. Expected classical hydrogen bonds N-H...O and O-H...O appear in the chargetransfer salts, and asymmetric units of these two forms both contain water molecules which play a significant role in building novel supramolecular architectures. Robust hydrogen-bond interactions between 1-methylpiperazine and aromatic acid provide sufficient driving force to direct the two crystals to three-dimensional structures. Weak interactions C-H-O emerging in salts 1 and 2 further enhance their crystal structures. As a consequence, hydrogen-bonding interactions in these compounds afford diverse 3D net supramolecular architectures. Thermal stability of these compounds was investigated by thermogravimetric analysis（TGA）.1-Methylpiperazine was employed to crystallize with 2,4-dihydroxybenzoic acid and 1,8-naphthalene acid, affording two multi-component hydrogen-bonding salts [（C5H14N2）^2＋-（C7H5O4）2^·H2O]（1） and [（C5H14N2）^2＋（C12H6O4）^2-.2H2O]（2）. These two forms of salts are both monoclinic systems with space group P21/c（14）. The lattice parameters of salts 1 and 2 are a=1.32666（10） nm, b=0.90527（7） nm, c=1.67107（13） nm, β=103.125（1）° and a=1.4950（2） nm, b=0.75242（15） nm, c=1.6563（3） nm, β=92.834（2）°, respectively. Expected classical hydrogen bonds N-H...O and O-H...O appear in the chargetransfer salts, and asymmetric units of these two forms both contain water molecules which play a significant role in building novel supramolecular architectures. Robust hydrogen-bond interactions between 1-methylpiperazine and aromatic acid provide sufficient driving force to direct the two crystals to three-dimensional structures. Weak interactions C-H-O emerging in salts 1 and 2 further enhance their crystal structures. As a consequence, hydrogen-bonding interactions in these compounds afford diverse 3D net supramolecular architectures. Thermal stability of these compounds was investigated by thermogravimetric analysis（TGA）.

关 键 词：Structure characterization Hydrogen bond SYNTHON Organic salt 

分 类 号：TQ254.15[化学工程—有机化工] O614.813[理学—无机化学]