Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado 80208, United States.
J Phys Chem B. 2011 Jun 23;115(24):7986-90. doi: 10.1021/jp201978w. Epub 2011 May 27.
The electron spin-spin relaxation time (T(2)) for the 1:1 crystalline complex of α,γ-bisdiphenylene-β-phenylallyl (BDPA) with benzene was determined by continuous wave (CW) and rapid scan electron paramagnetic resonance (EPR). T(2) for individual BDPA particles found by simulation of rapid scan spectra or by simulation of the Lorentzian line shapes of CW spectra were in good agreement. The T(2) for small BDPA particles in air ranged from 80 to 160 ns, which corresponds to peak-to-peak Lorentzian linewidths of 0.82-0.41 G. The removal of oxygen from the samples had a greater impact on the line width for particles that had shorter T(2) in air. Heterogeneity in the g-value was not observed at X-band. Scanning electron microscope (SEM) images showed that the BDPA particles had varying morphology.
通过连续波 (CW) 和快速扫描电子顺磁共振 (EPR)，测定了 α,γ-双二苯乙烯-β-苯基丙烯 (BDPA) 与苯的 1:1 结晶配合物的电子自旋-自旋弛豫时间 (T(2))。通过对快速扫描光谱的模拟或对 CW 光谱的洛伦兹线型的模拟，找到了单个 BDPA 颗粒的 T(2)，结果非常吻合。在空气中，小 BDPA 颗粒的 T(2)范围为 80-160ns，相应的峰-峰洛伦兹线宽为 0.82-0.41G。从样品中除去氧气对在空气中 T(2)较短的颗粒的线宽有更大的影响。在 X 波段没有观察到 g 值的不均匀性。扫描电子显微镜 (SEM) 图像显示，BDPA 颗粒具有不同的形态。
