共查询到18条相似文献,搜索用时 116 毫秒
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利用真空蒸发的方法在玻璃载片上沉积了 18烷基取代螺吡喃薄膜 ,并利用光吸收谱和光电子谱研究了薄膜的光致变色特性及变色前后分子结构的变化情况。实验结果发现 ,真空蒸发沉积的 18烷基取代螺吡喃薄膜具有良好的光致变色性能 ,在紫外光的照射下可以发生明显的光致变色反映。光电子谱分析 :经紫外线照射后 ,N1s、O1s光电子峰发生明显的变化 ,说明经紫外线照射后分子结构发生了变化 ,导致分子内部电荷的重新分布。另外紫外线照射后氧含量增加 ,这是因为紫外线照射后薄膜表面对水汽的吸附能力增加所致 相似文献
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以β-萘酚经亚硝化反应得到中间体1-亚硝基-2-萘酚;以苯肼、3-甲基-2-丁酮为原料合成得到2,3,3-三甲基-3H-吲哚,经碘甲烷季铵盐化后在碱性条件下与1-亚硝基-2-萘酚反应得到1,3,3-三甲基吲哚啉螺萘并(噁)嗪光致变色化合物.通过1H NMR、IR和元素分析确证了中间体和目标分子的结构;讨论了温度对1-亚硝基-2-萘酚合成的影响、制备吲哚季铵盐时溶剂的选择以及目标化合物的合成与光致变色机理.目标化合物的甲醇溶液经紫外光照射后由无色变为淡兰色,显示了良好的光致变色性能. 相似文献
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真空蒸发沉积18烷基取代螺吡喃薄膜的光致变色及光电子谱研究 总被引:1,自引:0,他引:1
利用真空蒸发的方法在玻璃载片上沉积了18烷基取代螺吡喃薄膜,并利用光吸收谱和光电子谱研究薄膜的光致变色特性及变色前后分子结构的变化情况。实验结果发现,真空蒸发沉积的18烷基取代螺吡喃薄膜具有良好的光致变色性能,在紫外光的照射下可以发生明显的光致变色反映。光电子谱分析:经紫外线照射后,N1s、O1s光电子峰发生明显的变化 ,说明经紫外线照射后分子结构发生了变化,导致分子内部电荷的重新分布。另外紫外线照射后氧含量增加,这是因为紫外线照射后薄膜表面对水汽的吸附能力增加所致。 相似文献
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双缩合螺吡喃的合成与光谱性能 总被引:1,自引:0,他引:1
利用过量Fischer碱与3,5-二溴水杨醛反应合成了4-(2-亚甲基-1,3,3-三甲基吲哚啉-2′-基)-6,8-二溴-1,3′,3′-三甲基-螺[3,4-二氢-2H-1-苯并吡喃-2,2′-吲哚啉],经元素分析、红外光谱、核磁共振氢谱和熔点确认了其化学结构.利用紫外-可见光谱和荧光光谱对目标化合物的吸收光谱和光致发光光谱进行了研究,探索了目标产物的光致变色 性能.结果表明,该化合物较相应单缩合螺吡喃多了1个吲哚单元且熔点提高了50℃,其紫外-可见吸收光谱中开环体在 555nm处有最大吸收波长,荧光光谱中在433nm处可观察到荧光. 相似文献
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介绍了苯氧基萘并萘醌类化合物的合成方法及光致变色性能特点,并对该研究领域进行了展望。 相似文献
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设计并合成了苯并二呋喃酮、双偶氮-9,10-蒽二酮、苯并噻蒽以及偶氮-1,3,4-噻二唑4个系列的有机色素类化合物,并用UV,IR,1H NMR和元素分析表征了结构.采用飞秒激光,运用简并四波混频法,研究了化合物的三阶非线性光学性能.它们的三阶非线性光学极化率χ(3)为2.64~3.95×10-13esu,非线性折射n2为4.85~7.27×10-12esu,分子二阶超极化率γ为2.85~3.72×10-31esu.探索了化合物的分子结构对三阶非线性光学性能的影响.长的共轭链、吸供取代基和杂环的引入、取代基强的供电子或吸电子能力等因素有利于获得较大的三阶非线性光学性能. 相似文献
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合成了4种以间苯二甲酸、间苯二酚为中心,硝基为端基的芳香酯类香蕉形液晶(M1~M4)。利用红外光谱(IR)、核磁共振谱(1 H NMR)及元素分析对其分子结构进行了表征,通过差示扫描量热(DSC)、偏光显微分析(POM)、热重分析(TG)对其介晶性能、相行为及热稳定性进行了研究。结果表明,所合成的香蕉形化合物(M1~M4)均有液晶性,呈现树叶、马赛克、扇形、球粒及纹影织构;升、降温时的液晶区间分别为32.9~57.2℃(M1除外)与28.4~96.5℃;随着分子刚性增加,它们的tm、ti、tic值明显提高;该类物质热稳定性良好,5%热失重温度均在285℃以上。 相似文献
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Sulphate-based magnesium-zinc-aluminium synthetic hydrotalcite-like compounds have been prepared by coprecipitation with a sodium hydroxide solution. The corresponding metal solutions were coprecipitated at pH 10, aged in the mother liquor, washed several times and dried at 40 °C. Whatever the ratio of metal ions in the initial metal sulphate solutions, hydrotalcite compounds were formed during coprecipitation. The temperature of preparation and ageing time did not effect the final crystal structure. By comparing the properties of the Mg-Al layered compounds, it seems that when the zinc content increases, the thermal stability of the hydrotalcite-like compounds decreases. 相似文献
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《International Journal of Inorganic Materials》1999,1(1):67-72
CdS and ZnS mixtures, Fe2O3 and TiO2 pillars were constructed in the interlayer of montmorillonite, layered double hydroxide, H4Nb6O17 and H2Ti4O9 by the intercalation reactions. The thicknesses of the semiconductors incorporated were less than 1 nm and the band gap energies of them were slightly larger than those of normal crystalline ones. The photocatalytic activities of the semiconductors incorporated were superior to those of unsupported ones. The incorporation of semiconductors in the interlayers of semiconducting layered compounds such as H2Ti4O9 and H4Nb6O17 was much more efficient in enhancing the hydrogen production activity than when an insulator such as montmorillonite and layered double hydroxide was used, since the recombination of photo-induced electrons and holes was depressed by the electron transfer from the incorporated semiconductors to the semiconducting host layer. 相似文献
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Red, blue and green emitting lamp phosphors such as Eu3+ doped Y2O3 (red phosphor), Eu2+ doped Ba0·64Al12O18·64, BaMgAl10O17 and BaMg2Al16O27 (blue phosphors) and Ce0·67Tb0·33MgAl11O19 and Eu2+, Mn2+ doped BaMgAl10O17 (green phosphors) have been prepared by the combustion of the corresponding metal nitrates (oxidizer) and oxalyl dihydrazide/urea/carbohydrazide
(fuel) mixtures at 400°–500°C within 5 min. The formation of these phosphors has been confirmed by their characteristic powder
X-ray diffraction patterns and fluorescence spectra. The phosphors showed characteristic emission bands at 611 nm (red emission),
430–450 nm (blue emission) and 515–540 nm (green emission). The fine-particle nature of the combustion derived phosphors has
been investigated using powder density, particle size and BET surface area measurements.
Paper presented at the poster session of MRSI AGM VI, Kharagpur, 1995 相似文献