Both increasing the Iso-to-Col transition and lowering the solidifying temperatures of a triazine-based dendrimer by introducing CN polar groups in the dendritic core

淡江大學機構典藏 > 理學院 > 化學學系暨研究所 > 期刊論文 > Item 987654321/118896

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题名:	Both increasing the Iso-to-Col transition and lowering the solidifying temperatures of a triazine-based dendrimer by introducing CN polar groups in the dendritic core
作者:	Lee, Cheng-Hua;Huang, Chun-Chi;Li, Chia-Ying;Lai, Long-Li;Lee, Jey-Jau;Hsu, Hsiu-Fu
日期:	2019-10-20
上传时间:	2020-07-13 12:10:23 (UTC+8)
出版者:	Royal Society of Chemistry
摘要:	Two new triazine-based dendrimers 1a and 1b, containing –NY(CH2)3NY– linkers between two G3 dendrons (1a: Y = Bz, 1b: Y = 4-cyanoBz; Bz = benzyl), were successfully prepared in ∼32 and ∼34% yields, respectively. Compared with dendrimer 1c that contains –NH(CH2)3NH– linkers between two G3 dendrons, dendrimer 1a exhibits a similar mesogenic range to 1c, but 1b possesses a broader mesophase-temperature range than 1c. Surprisingly, dendrimer 1b not only increases the isotropic-phase-to-columnar-mesophase (Iso-to-Col) transition temperature but also lowers the solidifying temperature on cooling. It is believed that the CN groups in the dendritic linker of 1b increase both the molecular interaction between dendrimers, leading to its increasing Iso-to-Col transition temperature, and dendritic distances within columns, leading to its decreasing solidifying temperature.
關聯:	Journal of Materials Chemistry C 7(45), p.14232-14238
DOI:	10.1039/C9TC04004H
显示于类别:	[化學學系暨研究所] 期刊論文

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