Above Room Temperature Organic Dielectric Switchable Material: Diprotonated 1, 4‐Diazabicyclo[2.2.2]octane Shifts between Two Pyruvic Acids. Issue 1 (27th November 2018)

• Record Type: Journal Article
• Authors: Fang, Ting; Jie, Yang; Huang, Yuan; Ye, Yao‐Hui; Chen, Wen‐Bin; Li, Bing‐Qi; Zou, Chen; Xu, Dan‐Lei; Qian, Kun
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 645:Issue 1(2019)
• Page Start: 3
• Page End: 7
• Publication Date: 2018-11-27
• Subjects: 1, 4‐Diazabicyclo[2.2.2]octane -- Pyruvic acid -- Hydrogen bonds -- Cocrystals -- Phase transitions; Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.201800362
• Languages: English
• ISSNs: 0044-2313

Abstract

Abstract : A pure organic single crystal, [H2 dabco]· [PA]2 ([H2 dabco] 2+ = diprotonated 1, 4‐diazabicyclo‐[2.2.2]octane, PA = pyruvic acid), was synthesized and its dielectric property was studied. [H2 dabco]· [PA]2 owns a distinctive architecture composed of discrete hydrogen‐bonded trimeric units, of which one [H2 dabco] 2+ cation bridged by two PA – anions through N–H··· O hydrogen bonding. The switchable property around 348 K was revealed by crystal structure studies between low and high dielectric states. In the high temperature phase, the [H2 dabco] 2+ cation presents itself in a rotationally disordered state and lies at the symmetric center of the trimer. In the room temperature phase, it is frozen in an ordered state and shifts toward a PA – anion at one end along the hydrogen bond. Abstract :