Jones Andrew O F, Röthel Christian, Lassnig Roman, Bedoya-Martínez O N, Christian Paul, Salzmann Ingo, Kunert Birgit, Winkler Adolf, Resel Roland
Institute of Solid State Physics , Graz University of Technology , Petersgasse 16 , 8010 Graz , Austria . Email:
BioTechMed-Graz , Austria.
CrystEngComm. 2017 Apr 14;19(14):1902-1911. doi: 10.1039/c7ce00227k. Epub 2017 Mar 14.
Epindolidione, a hydrogen-bonded derivative of the organic semiconductor tetracene, is an organic pigment which has previously been used to produce stable OFETs with relatively high hole mobilities. Despite its use as an inkjet pigment and organic semiconductor, the crystal structure of epindolidione has proved elusive and is currently unknown. In this work, we report a crystal structure solution of epindolidione determined from vapor deposited thin films using a combined experimental and theoretical approach. The structure is found to be similar to one of the previously reported epindolidione derivatives and is most likely a surface-mediated polymorph, with a slightly different crystal packing compared to the bulk powder. The effect of substrate temperature on film morphology and structure is also investigated, where it is found that the crystallite orientation can be tuned by deposition at different substrate temperatures. The results also illustrate the possibilities for crystal structures to be solved from thin films.
表吲哚二酮是有机半导体并四苯的一种氢键衍生物，是一种有机颜料，此前已被用于制造具有相对较高空穴迁移率的稳定有机场效应晶体管。尽管表吲哚二酮用作喷墨颜料和有机半导体，但其晶体结构一直难以确定，目前仍不清楚。在这项工作中，我们报告了采用实验与理论相结合的方法，从气相沉积薄膜确定的表吲哚二酮晶体结构。发现该结构与先前报道的表吲哚二酮衍生物之一相似，很可能是一种表面介导的多晶型物，与块状粉末相比，晶体堆积略有不同。还研究了衬底温度对薄膜形态和结构的影响，发现通过在不同衬底温度下沉积可以调整微晶取向。结果还说明了从薄膜解析晶体结构的可能性。
