Self-assembled structures of bent-shaped π-conjugated compounds: effect of siloxane groups for nano-segregation,CrystEngComm

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Self-assembled structures of bent-shaped π-conjugated compounds: effect of siloxane groups for nano-segregation
CrystEngComm ( IF 2.6 ) Pub Date : 2020-11-05 , DOI: 10.1039/d0ce01325k
Atsushi Seki _{1,

2,

3,

4,

5} , Shinobu Uemura _{1,

2,

3,

4,

5} , Masahiro Funahashi _{1,

2,

3,

4,

5}

Affiliation

Controlling nanostructures of organic compounds is an essential issue for optimization of functions such as ferroelectricity, and mass transport and carrier transport properties. The competition and interplay of various intermolecular interactions play key roles in the formation of fine structures. Herein, we discuss the tuning of layer and columnar structures of polar bent-shaped molecules. Two types of bent-shaped π-conjugated compounds were synthesized. While alkenyl-terminated compound 1 forms layered assemblies, disiloxy-terminated compound 2 forms nanofibres. The bulky disiloxane units should contribute to the decrease of crystallinity and the inhibition of two-dimensional layer structures. The morphology of the columnar self-assemblies of compound 2 is quite different from that of the layered aggregates of compound 1. Furthermore, the morphology of the equimolar mixture 1/2 is changed in relation to the aggregation rate. The introduction of the bent-shaped skeleton and bulky disiloxane units successfully tunes the nanostructures. These results suggest the utility of the bent-type molecular shape and oligosiloxane units to form fine nano-segregated structures.

中文翻译：

弯曲形π共轭化合物的自组装结构：硅氧烷基团对纳米分离的影响

控制有机化合物的纳米结构是优化功能（如铁电性以及质量传输和载流子传输特性）的重要问题。各种分子间相互作用的竞争和相互作用在精细结构的形成中起关键作用。在这里，我们讨论极性弯曲形分子的层和柱状结构的调整。合成了两种弯曲形状的π共轭化合物。烯基封端的化合物1形成层状组件，而二甲氧基封端的化合物2形成纳米纤维。庞大的二硅氧烷单元应有助于降低结晶度并抑制二维层结构。化合物2的柱状自组装体的形态与化合物1的层状聚集体完全不同。此外，等摩尔混合物的形态1 / 2相对于聚集率被改变。弯曲形骨架和庞大的二硅氧烷单元的引入成功地调节了纳米结构。这些结果表明弯曲型分子形状和低聚硅氧烷单元形成精细的纳米分离结构的实用性。

更新日期：2020-11-19

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