Azocalixarenes.7: Synthesis and study of the absorption properties of novel mono-azo substituted chromogenic calix[4]arenes
作者:HASALETTİN DELİGÖZ、ÖZLEM ÖZEN KARAKUŞ
DOI:10.3906/kim-1003-102
日期:——
Eight new mono-azo substituted chromogenic calix[4]arenes (1-8) were synthesized by diazo-coupling reactions in which 25,26,27-tribenzoyloxy-28-hydroxy-5,11,17-tri-(tert-butyl)calix[4]arene and diazonium salts (2-, 3-, and 4-nitroaniline; 4-phenyl azoaniline; 3- and 4-chloroaniline; or 2- and 4-methylaniline) formed the corresponding mono-azo substituted derivatives in high yields. The mono-azo substituted calix[4]arenes were characterized by UV-Vis, FT-IR, and ^1H-NMR spectroscopic techniques. Elemental analysis was also carried out. In addition, the effects of varying pH levels and solvents upon the absorption ability of azocalix[4]arenes substituted with electron-donating and electron-withdrawing groups at their o-, m-, and p- positions were studied. The results proved that the absorption maxima of the prepared compounds showed large bathochromic effects in comparison with analog compounds containing aromatic amine residue. Furthermore, concentration effects on the visible absorption maxima of the azocalix[4]arene compounds studied were also reported.
在重氮偶联反应中,25,26,27-三苯甲酰基氧基-28-羟基-5,11,17-三-(叔丁基)钙[4]炔和重氮盐(2-、3-和 4-硝基苯胺;4-苯基偶氮苯胺;3-和 4-氯苯胺;或 2-和 4-甲基苯胺)形成相应的单偶氮取代的衍生物,合成了八种新的单偶氮取代的发色性钙[4]炔(1-8);4-苯基偶氮苯胺;3-和 4-氯苯胺;或 2-和 4-甲基苯胺)高产率地形成了相应的单偶氮取代衍生物。 这些单偶氮取代的钙[4]烯通过紫外-可见光、傅立叶变换红外和^1H-核磁共振光谱技术进行了表征。 同时还进行了元素分析。 此外,还研究了不同 pH 值和溶剂对在 o、m 和 p 位上被电子供体和电子吸收体取代的偶氮钙并[4]烯的吸收能力的影响。 结果证明,与含有芳香胺残基的类似化合物相比,所制备化合物的吸收最大值显示出较大的浴色效应。 此外,还报告了浓度对所研究的偶氮羰基[4]炔化合物的可见吸收最大值的影响。