The synthesis and magnetic properties of carboxylic acid-derived 1, 2, 4-benzotriazinyl radicals and their coordination particles. (31st October 2022)

• Record Type: Journal Article
• Authors: Qu, Le; Chen, Hanjiao; Shi, Chengjia; Li, Huaqing; Ai, Qi; Liu, Xuying; Yang, Cao; Yang, Huige; Hu, Xiaoguang
• Is Part Of: New journal of chemistry. Volume 46:Number 44(2022)
• Page Start: 21366
• Page End: 21372
• Publication Date: 2022-10-31
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj03772f
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Stable magnetic coordination particles based on π-conjugated 1, 2, 4-benzotriazinyl radical ligands were synthesized using a sonochemical method. Abstract : Organic conjugated radicals are promising materials for organic magnets and spintronics; however, their solid-state properties are difficult to control and predict. We report the synthesis and magnetic properties of carboxylic acid-functionalized 1, 2, 4-benzotriazinyl radicals DAR, TAR and their corresponding coordination particles. These hydrogen bond containing compounds exhibit a typical antiferromagnetic behavior and good thermal stability up to 300 °C. Moreover, DAR and TAR possess stronger intermolecular spin–spin interactions than their ester counterparts as supported by their wider ESR line widths. Nanosize coordination particles are obtained upon sonication of these two radicals with metal ions at 0 °C. Diamagnetic Zn 2+ -based cubic UD-Zn and spherical UT-Zn show stronger spin–spin interactions than their corresponding ligands, along with the retained forbidden transition signal Δ m s = ±2. In sharp contrast, paramagnetic Cu 2+ -derived CPs display very weak magnetic signals due to the redox reaction between Cu 2+ and radicals. This work is useful for the future design of conjugated radicals and radical ligand-based magnetic coordination particles.