Poly(arylmethyl) Octet (S = 7/2) Heptaradical and Undecet (S = 5) Decaradical
Poly(arylmethyl) Octet (S = 7/2) Heptaradical and Undecet (S = 5) Decaradical
复制标题
聚（芳基甲基）八位字节 (S = 7/2) 七进制和十一进制 (S = 5) 十进制
DOI：
10.1021/ja00031a055
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发表时间：
1992
影响因子：
15
通讯作者：
S. Thayumanavan
中科院分区：
文献类型：
--
作者：
A. Rajca;Suchada Utamapanya;S. Thayumanavan
图1所示。上图：17 'in THF/2-MeTHF玻璃在100 K下的x波段ESR光谱。底部：模拟Am，= 1光谱，使用m，依赖线宽和八位元zfs，\D/hc\= 0.001 63 cm" 1和\E/hc\= 0 cm" 1。也就是说，已知的1,3连接双自由基对三重态基态的巨大偏好可能转化为多自由基中高自旋基态的显著稳定。7′8本文报道了S= 7/2共轭烃七基化合物17和同源化合物5= 5十基化合物210*的制备、磁共振波谱和SQUID研究。I7和210'都是迄今为止已知的最高自旋共轭多自由基66,9,210*的5= 5值等于最高自旋有机分子5= 5五碳烯的5值。43
Figure 1. Top: X-band ESR spectrum for l7'in THF/2-MeTHF glass at 100 K. Bottom: Simulated Am,= 1 spectrum using m,-dependent line widths and octet zfs,\D/hc\= 0.001 63 cm" 1 and\E/hc\= 0 cm" 1. that is, the known large preference for a triplet ground state for 1, 3-connected diradicals may translate into the significant sta-bilization of a high-spin ground state in polyradicals. 7’8 Now we report the preparation, magnetic resonance spec-troscopy, and SQUID studies of the S= 7/2-conjugated hydrocarbon heptaradical l7, and the homologous 5= 5 decaradical 210*. Both I7, and 210'are the highest spin-conjugated polyradicals known to date, 66, 9 and the value 5= 5 for 210* equals the 5 value of the highest spin organic molecule, the 5= 5 penta-carbene. 43