Evaluation of the β value of the phenylene unit by probing exchange interaction between two nitroxides.
Evaluation of the β value of the phenylene unit by probing exchange interaction between two nitroxides.
复制标题
通过探测两种硝基氧之间的交换相互作用来评估亚苯基单元的 β 值。
DOI：
10.1021/ol102339m
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发表时间：
2010
期刊：
影响因子：
5.2
通讯作者：
K. Matsuda
中科院分区：
文献类型：
--
作者：
Kenji Higashiguchi;K. Yumoto;K. Matsuda
合成了含两个硝酰基氮氧自由基的双环[2.2.2]辛烷的低聚亚苯基分子棒，研究了对亚苯基的衰变常数。通过对不同棒长的双自由基的ESR谱的测量和模拟，发现交换作用减弱，衰减常数β为0.51 ± 0.01 π（-1）。这一结果表明，中性自由基之间的自旋-自旋交换相互作用具有类似于分子电导的衰减常数。
Oligophenylene molecular rods with bicyclo[2.2.2]octane having two nitronyl nitroxide radicals were synthesized to investigate the decay constant of p-phenylene. By the measurement and simulation of the ESR spectra of the biradicals with different rod length, it was found that the exchange interaction was decreased with the decay constant β of 0.51 ± 0.01 Å(-1). This result indicates that the spin-spin exchange interaction between neutral radicals has a decay constant similar to the molecular conductance.