Deciphering the ground state of a C3-symmetrical Blatter-type triradical by CW and pulse EPR spectroscopy
作者:Athanassios K. Boudalis、Christos P. Constantinides、Nicolas Chrysochos、Raanan Carmieli、Gregory Leitus、Andreas Kourtellaris、Daniel B. Lawson、Panayiotis A. Koutentis
DOI:10.1016/j.jmr.2023.107406
日期:2023.4
3,5-triyl)tris(1-phenyl-1H-benzo[e][1,2,4]triazin-4-yl) (1) is a C3-symmetrical triradical comprised of three Blatter radical units connected at the 1, 3, 5 positions of a central trimethylenebenzene core. This triradical has an excellent air, moisture, and thermal stability. Single-crystal XRD indicates that triradical 1 adopts a propeller-like geometry with the benzotriazinyl moieties twisted by 174
3,3',3''-(Benzene-1,3,5-triyl)tris(1-phenyl-1 H -benzo[ e ][1,2,4]triazin-4-yl) ( 1 ) 是一个C 3 -对称三自由基,由三个 Blatter 自由基单元组成,连接在中心三亚甲基苯核心的 1、3、5 位。这种三基具有出色的空气、水分和热稳定性。单晶 XRD 表明三自由基1采用螺旋桨状几何结构,苯并三嗪基部分扭曲 174.1(2)°,并沿 c 排列成一维链轴形成广泛的弱分子间相互作用网络。冷冻溶液连续波 (CW) EPR 光谱和变温场扫描回波检测 (FSED) 光谱揭示了自旋系统内的分子内铁磁交换,支持四重奏 S = 3/2 基态。DFT 计算进一步支持了这些实验结果。