【摘要】 测定了一个苯环上不同位置被氨基取代的四苯基卟吩衍生物的吸收和发射光谱及荧光寿命。结果表明,邻位取代对光谱性质的影响表现出明显的特殊性,即电子跃迁强度减小和荧光寿命出现增大的趋势。这种邻位取代效应并不能用诱导效应来解释,它是由于取代基改变了苯环和卟啉环共轭相互作用的程度所致。更多还原

【Abstract】 The electronical absorption and fluorescence (?)nissien cha acteristics of tetraphenylporphyin with an amino group attached to different position of one of its four phenylrings have been examined. The results obtained reveal a pronounced ortho-substitution effect on the optical transition probability including electronical absorption and fluorescence decay. Based on the four orbital theory developed by M.Gouterman, this ortho-substitution effect can be interpreted in terms of the change in conjugation between the π-electron systems of both phenyland porphyrin rings due to the steric hindrance of the substituent.更多还原