Ferromagnetic spin-coupling 4,4″-through metaterphenyl: models for high-spin polymers
作者:Richard J. Bushby、Norman Taylor、Rhidian A. Williams
DOI:10.1039/b612798n
日期:——
Model diradical dications have been synthesised which have the 4,4â³-through metaterphenyl spin-coupling pathway found in arylamine high-spin polymers. In the model triplet diradical dication derived by a two-electron oxidation of N,N,Nâ³,Nâ³-tetrakis(4-tert-butyl-2-methoxyphenyl)-3,3â³-dimethoxy[1,1â²;3â²,1â³]terphenyl-4,4â³-diamine the separation between the triplet and singlet states was found to be 0.083 kcal molâ1. This value is close to that predicted on the basis that the energy difference should be proportional to the product of the spin densities in the âcommonâ ring (the ring in which the two spin densities overlap). This is an important principle in the design of new high-spin polymers.
已经合成了一种模型双自由基双阳离子,它具有在芳胺高自旋聚合物中发现的4,4'-通过间三联苯自旋耦合途径。在通过N,N,N'',N''-四(4-叔丁基-2-甲氧基苯基)-3,3''-二甲氧基[1,1';3',1'']三联苯-4,4''-二胺的两电子氧化衍生的模型三重态双自由基双阳离子中,发现三重态和单重态之间的能隙为0.083 kcal mol^-1。这个值接近于基于能量差异应与'公共'环(两个自旋密度重叠的环)中自旋密度的乘积成比例的预测值。这是设计新高自旋聚合物的一个重要原则。