作者:Shigeharu Wakabayashi、Yuri Kato、Keiko Mochizuki、Rieko Suzuki、Mana Matsumoto、Yoshikazu Sugihara、Makoto Shimizu
DOI:10.1021/jo061684h
日期:2007.2.1
method for the synthesis of 1- and 2-pyridylazulenes, and of 1,3-dipyridylazulenes, is described. Color and spectral changes of these pyridylazulenes upon the addition of either acid or metal ions were investigated in detail. The color changed from blue to red upon the addition of trifluoroacetic acid or soft metal ions, depending on the substitution patterns of the pyridyl group on the azulene skeleton
描述了一种合成1-和2-吡啶基azulenes和1,3-二吡啶基azulenes的简便方法。详细研究了添加酸或金属离子后这些吡啶基azulenes的颜色和光谱变化。添加三氟乙酸或软金属离子后,颜色会从蓝色变为红色,具体取决于a烯骨架上吡啶基的取代方式。根据光谱数据检查质子化或配位产物的结构。发现在吡啶环的氮原子上发生金属离子的质子化或配位,而在z环的碳原子上未发生。还确定了几种用作pH指示剂的吡啶基azulenes的过渡间隔。