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Control of the homeotropic order of discotic hexa-peri-hexabenzocoronenes

机译：盘状六-六-六苯并异戊二烯的垂直顺序的控制

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The thermal properties an self-organization of hexa-peri-hexabenzocoronene (HBC) derivatives with dove-tailed alkyl chains of various lengths have been investigated using polarized optical microscopy and wide angle X-ray scattering. It is shown that the size-related increase of steric interactions among the peripheral side chains substituted to the aromatic core leads to a dramatically lowered isotropization temperature, allowing thermal processing at practical temperatures. Additionally, the introduction of ether linkages within the side chains enhances the affinity of the discotic molecules towards polar surfaces, resulting in homeotropic self assembly when the compounds are processed from the isotropic state between two surfaces and, for the first time, as a thin film on a single surface. It is established that the degree of homeotropic order is influences by the phase behavior the supramolecular order in the bulk and the surface affinity of the corresponding derivatives. These results are important for the design of photovoltaic cells based on HBC derivatives.
机译：使用偏振光学显微镜和广角X射线散射研究了具有各种长度的燕尾式烷基链的六-peri-六苯并并戊二烯（HBC）衍生物的自组织热性质。结果表明，取代芳族核的周边侧链之间空间相互作用的尺寸相关的增加导致各向同性温度大大降低，从而允许在实际温度下进行热处理。此外，在侧链中引入醚键可增强盘状分子对极性表面的亲和力，当化合物从两个表面之间的各向同性态（首次成为薄膜）进行加工时，可导致同型自组装在一个表面上。建立了垂直序度受本体中超分子序的相行为和相应衍生物的表面亲和力的影响。这些结果对于基于HBC衍生物的光伏电池设计非常重要。

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