Challenges in Controlled Thermal Deposition of Organic Diradicals
Challenges in Controlled Thermal Deposition of Organic Diradicals
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DOI：
10.1021/acs.chemmater.0c03880
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发表时间：
2021-01-27
影响因子：
8.6
通讯作者：
Casu, Maria Benedetta
中科院分区：
文献类型：
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作者：
Junghoefer, Tobias;Gallagher, Nolan M.;Casu, Maria Benedetta
我们证明，它是可能的，在一个受控的环境中蒸发双自由基获得薄膜中的双自由基字符被保存。然而，蒸发是一个挑战。两个自由基位点的存在使得分子在非常稳定的单个自由基的情况下也更具反应性。我们探讨了在这一现象中发挥作用的参数。我们发现晶体的形成能越高，完整自由基的蒸发就越困难。不成对电子的大的离域有助于双自由基经受蒸发。我们还研究了暴露于X射线或空气时薄膜的寿命。热降解的开始在膜寿命中起作用。事实上，蒸发温度相对于起始温度越低，膜寿命越长。考虑到我们的发现，不同的双自由基的蒸发可以成功地解决。
We demonstrate that it is possible to evaporate diradicals in a controlled environment obtaining thin films in which the diradical character is preserved. However, evaporation represents a challenge. The presence of two radical sites makes the molecules more reactive also in the case of very stable single radicals. We have explored the parameters that play a role in this phenomenon. We found that the higher the formation energies of the crystal, the more difficult is the evaporation of intact radicals. Large delocalization of the unpaired electrons helps the diradical to stand evaporation. We have also investigated the lifetime of the films when exposed to X-rays or air. The onset of thermal degradation plays a role in the film lifetime. In fact, the lower the evaporation temperature with respect to the onset temperature, the longer is the film lifetime. The evaporation of different diradicals can be successfully addressed considering our findings.