A Benzene-1,3,5-Triaminyl Radical Fused with Zn<sup>II</sup>
-Porphyrins: Remarkable Stability and a High-Spin Quartet Ground State
作者:Daiki Shimizu、Atsuhiro Osuka
DOI:10.1002/anie.201801080
日期:2018.3.26
with three ZnII‐porphyrins was synthesized through a three‐fold oxidative fusion reaction of 1,3,5‐tris(ZnII‐porphyrinylamino)benzene followed by oxidation with PbO2 as key steps. This triaminyl radical has been shown to possess a quartet ground state with a doublet–quartet energy gap of 3.1 kJ mol−1 by superconducting quantum interference device (SQUID) studies. Despite its high‐spin nature, this triradical
具有三个稠合的Zn的苯-1,3,5- triaminyl自由基II -porphyrins通过1,3,5-三三倍氧化聚变反应合成(锌II -porphyrinylamino)苯,随后用氧化的PbO 2为关键步骤。该三氨基自由基已证明具有四重态基态,其双重态-四重态能隙为3.1 kJ mol -1通过超导量子干涉仪(SQUID)的研究。尽管具有高自旋特性,但该三基自由基非常稳定,因此可以在环境条件下分离和重结晶。而且,该三基可以固体形式保存一年以上,而不会严重变质。三自由基的高稳定性归因于在卟啉链段上的有效自旋离域和在氮中心和卟啉内消旋位置的空间保护。