Optically actuating ultra-stable radicals in a large π-conjugated ligand constructed photochromic complex

• 作者: Ji-Xiang Hu Xiao-Fan Jiang Yu-Juan Ma Xue-Ru Liu Bang-Di Ge A-Ni Wang Qi Wei Guo-Ming Wang
• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: ARTICLES
• 页码范围: 432-438
• 页数: 7页
• 语种: 英文

摘要

Producing ultra-stabilized radicals via light irradiation has raised considerable concern but remains a tremendous challenge in functional materials.Herein,optically actuating ultra-stable radicals are discovered in a sterically encumbered and large π-conjugated tri(4-pyridyl)-1,3,5-triazine (TPT) ligands constructed photochromic compound Cu3(H-HEDP)2TPT2·2H2O (QDU-12;HEDP=hydroxyethylidene diphosphonate).The photogeneration of TPT radicals is the photoactive behavior of electron transfer from HEDP motifs to TPT units.The ultra-long-lived radicals are contributed from strong interchain π-π interactions between the large π-conjugated TPT components,with the radical lifetime maintained for about 18 months under ambient conditions.Moreover,the antiferromagnetic couplings between TPT radicals and Cu2+ ions plummeted the demagnetization to 35％ of its original state after light irradiation,showing the largest room temperature photodemagnetization in the current radicalbased photochromic materials.