Molecular engineering of nanoscale order in organic electro-optic glasses
Molecular engineering of nanoscale order in organic electro-optic glasses
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DOI：
10.1039/c2jm14915j
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发表时间：
2012-03
影响因子：
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通讯作者：
S. Hammond;Jessica Sinness;Sara Dubbury;Kimberly A. Firestone;J. Benedict;Z. Wawrzak;Olivier Clot
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文献类型：
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作者：
S. Hammond;Jessica Sinness;Sara Dubbury;Kimberly A. Firestone;J. Benedict;Z. Wawrzak;Olivier Clot
有机电光材料中块状纳米级有序的合理设计，其中强偶极-偶极相互作用往往比用于自组装过程的较弱力占主导地位，仍然是一个有吸引力但难以捉摸的目标。为此，合成了一系列伪盘状偶极非线性光学发色团并对其进行了充分表征。理论指导和迭代分子设计过程已成功地在有机电光玻璃中实现了长程纳米级有序。小角度薄膜 X 射线衍射实验证明了大多数这些材料的自组装层状形态。使用同步加速器 X 射线源的低温晶体学提供了代表性系统的结构。这种结构与薄膜 X 射线衍射、原子力显微镜、紫外-可见-近红外吸收光谱和折射率实验相结合，阐明了薄膜中的纳米级有序性。讨论了这些材料在电光方面的应用。
The rational design of bulk nanoscale order in organic electro-optic materials, where the strong dipole–dipole interactions tend to dominate over the weaker forces exploited for self-assembly processes, remains an attractive yet elusive goal. Towards this end, a series of pseudo-discotic dipolar nonlinear optical chromophores have been synthesized and fully characterized. Theoretical guidance and an iterative molecular design process have succeeded in engineering long-range nanoscale order in organic electro-optic glasses. Small-angle thin-film X-ray diffraction experiments demonstrate a self-assembled lamellar morphology in a majority of these materials. Cryogenic crystallography, using a synchrotron X-ray source, afforded the structure of a representative system. This structure, in concert with thin-film X-ray diffraction, atomic force microscopy, UV-vis-NIR absorption spectroscopy, and refractive index experiments elucidated the nanoscale order in the films. Application of these materials in electro-optics is discussed.