Lai Long-Li, Lee Cheng-Hua, Wang Ling-Yung, Cheng Kung-Lung, Hsu Hsiu-Fu
Department of Applied Chemistry, National Chi Nan University, Puli, Nantou, Taiwan 545.
J Org Chem. 2008 Jan 18;73(2):485-90. doi: 10.1021/jo701990w. Epub 2007 Dec 23.
Dendrons Gn-Cl and Gn-NH (n = 2-4) and novel dendrimers Gn-N approximately N-Gn (n = 2-4) based on triazine and piperazine units were efficiently prepared in good yields without employing the protection and deprotection processes and are fully characterized by 1H NMR and 13C NMR spectroscopies, elemental analysis, and mass spectroscopy. These compounds are transparent and possess good thermal stability. G4-Cl shows a monotropic columnar phase in a narrow range with a coexisting crystalline phase. Dendron G4-NH shows a rectangular column-phase, and dendrimer G4-N approximately N-G4 exhibits a monotropic hexagonal columnar phase. These identifications were supported by the polarizing optical scope and powder XRD studies.
基于三嗪和哌嗪单元的树枝状分子Gn-Cl和Gn-NH（n = 2 - 4）以及新型树枝状聚合物Gn-NN-Gn（n = 2 - 4）在不采用保护和脱保护过程的情况下以高收率高效制备，并通过1H NMR和13C NMR光谱、元素分析和质谱进行了全面表征。这些化合物是透明的，具有良好的热稳定性。G4-Cl在较窄范围内呈现单向柱状相且伴有共存的结晶相。树枝状分子G4-NH呈现矩形柱状相，树枝状聚合物G4-NN-G4呈现单向六方柱状相。这些鉴定结果得到了偏光显微镜和粉末XRD研究的支持。
