Synthesis and characterization of 2H-pyrano[3,2-c]coumarin derivatives and their photochromic and redox properties
作者:Chin-Neng Huang、Pei-Yu Kuo、Chi-Hui Lin、Ding-Yah Yang
DOI:10.1016/j.tet.2007.07.041
日期:2007.10
A series of 2H-pyrano[3,2-c]chromen-5-one derivatives were synthesized and characterized. Their photochromic and redox properties were investigated by the UV–vis absorption spectroscopy. While compounds with one or two phenyl groups incorporated at the 2-position were present in both ring-opened (5a and 10a) and ring-closed (6a and 11a) forms, the incorporation of an N,N-dimethylamino group on either
合成并表征了一系列2 H-吡喃并[3,2 - c ]铬-5-酮衍生物。通过紫外可见吸收光谱研究了它们的光致变色和氧化还原特性。虽然在2位上带有一个或两个苯基的化合物以开环(5a和10a)和闭环(6a和11a)的形式存在,但N,N-二甲基氨基的掺入情况芳环的“α”仅导致开环(5b和10b)形式的形成。闭环形式13和 18在吡喃部分的3-位带有甲基取代基的化合物不能表现出光致变色行为。在芳环上具有N,N-二甲基氨基的化合物23在可见光区域显示出增加的肩部吸收,并且在紫外线照射下颜色发生明显变化。当用硼氢化钠处理时,非荧光10b立即从深红色变为无色。还原后的28为蓝色荧光,量子产率为0.46,可通过DDQ氧化还原为原始颜色。