一维链状氢键型甘氨酸超分子化合物[(Gly)^(+)/_(2)(18-crown-6)_(2)(MnCl4)^(2‒)]的合成、结构及介电性质  

Synthesis,Structure and Dielectric Properties of One-dimensional Chain Hydrogen Glycine Supramolecular Compound[(Gly)^(+)_(2)(18-crown-6)_(2)(MnCl4)^(2‒)]

作　　者：王乐 秦刘磊 刘洋[1] 任丽 徐慧婷 刘尊奇[1] WANG Le;QIN Liulei;LIU Yang;REN Li;XU Huiting;LIU Zunqi(Chemical Engineering College,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]新疆农业大学化学工程学院,乌鲁木齐830052

出　　处：《高等学校化学学报》2021年第3期691-699,共9页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21561030);新疆维吾尔自治区研究生科研创新项目(批准号:XJ2020G162)资助.

摘　　要：以甘氨酸(Gly)、18-冠醚-6、二氯化锰(MnCl_(2))和盐酸为原料,通过蒸发法获得一种新型相变一维链状氢键型甘氨酸超分子化合物[(Gly)^(+)/_(2)(18-crown-6)_(2)(MnCl4)^(2‒)](1).通过元素分析、变温X射线单晶衍射和介电测试等手段对其进行了表征和解析.实验结果表明,该晶体属于单斜晶系,空间群从P2_(1)/c(100 K)转化为C2/c(293 K).随着温度升高,[MnCl_(4)]^(2‒)呈现无序状态的共棱双四面体结构.质子化甘氨酸分子和分子内羟基(—OH)发生动态摆动,引起O—H…Cl型一维氢键链产生明显伸缩运动,导致化合物1在一定温度范围内出现结构相变及介电异常.A new phase transition one-dimensional chain hydrogen-bonding glycine supramolecular[(Gly)^(+)/_(2)(18-crown-6)_(2)(MnCl4)^(2‒)](1)was prepared by evaporation method with the reaction of glycine(Gly),18-crown-6,transition metal compound MnCl2 and hydrochloric acid.Compound 1 was characterized and analyzed by means of elemental analysis,variable temperature X-ray single crystal diffraction and dielectric constant measurements.The results showed that crystal of the title complex belonged to monoclinic crystal system,space group changed from P2_(1)/c(100 K,low temperature)to C2/c(293 K,room temperature).[MnCl_(4)]^(2‒)anion displayed a double tetrahedral structure with common edges in a disordered state with the temperature increasing.Dynamic oscillations occured between the protonated glycine molecule and the intramolecular hydroxyl group(—OH),and built one-dimensional O—H…Cl hydrogen bonds chain with obvious stretching motion.These caused the structural phase transition and dielectric anomaly of compound 1 in a certain temperature range.

关 键 词：氢键 分子摆动 金属配合物 结构相变 阶梯状介电 

分 类 号：O614.7[理学—无机化学]