Gupta Monika, Pal Santanu Kumar
Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali , Knowledge City, Manauli 140306, India.
Langmuir. 2016 Feb 2;32(4):1120-6. doi: 10.1021/acs.langmuir.5b03353. Epub 2016 Jan 20.
A straightforward synthesis of multialkynylbenzene-bridged triphenylene-based dyad systems (via flexible alkyl spacers) that self-organize into room-temperature columnar structures over a long range is reported. The compounds with spacer lengths (n) of 8 and 10 exhibit a columnar rectangular mesophase whereas a compound with n = 6 shows a columnar rectangular plastic phase. Interestingly, the later compound (n = 6) shows the formation of well-nucleated spherulites of about several hundred micrometers that suggest the existence of a long-range uniform self-assembly of columns. All of these compounds show blue luminescence in solution and in the thin-film state under long-wavelength (365 nm) UV light. These compounds fulfill the described demands such as long-range columnar self-assembly at room temperature, a good yield with high purity, and blue-light emitters under the neat condition for possible potential applications in semiconductor devices. They also match the criteria of facile processing from the isotropic state because of their low isotropization temperature. This new class of materials is promising, considering the emissive nature and stabilization of the columnar mesophase at ambient temperature.
报道了一种简单的合成方法，通过柔性烷基间隔基合成多炔基苯桥连的基于三亚苯的二元体系，该体系能在室温下自组装成长程的柱状结构。间隔基长度（n）为8和10的化合物呈现柱状矩形中间相，而n = 6的化合物呈现柱状矩形塑性相。有趣的是，后一种化合物（n = 6）显示出形成了约几百微米的良好成核球晶，这表明存在柱状物的长程均匀自组装。所有这些化合物在长波长（365 nm）紫外光下的溶液和薄膜状态下均呈现蓝色发光。这些化合物满足了所述要求，如在室温下长程柱状自组装、高纯度的良好产率以及在纯净条件下作为蓝光发射体，有可能在半导体器件中得到潜在应用。由于它们的低各向同性温度，它们也符合从各向同性状态易于加工的标准。考虑到其发射性质和在环境温度下柱状中间相的稳定性，这类新型材料很有前景。
