摘要
用分光光度法测定了邻羟基苯基萤光酮（Ｏ－ＨＰＦ）与间羟基苯基萤光酮（ｍ－ＨＰＦ）的氢离解常数，结果为： Ｏ－ＨＰＦｐＫ１＝２．７３ ｐＫ２＝５．６２ ｐＫ３＝６．３９ ｐＫ４＝９．５８ ｐＫ５＝１１．１７ ｍ－ＨＰＦ ｐＫ１＝２．３２ ｐＫ２＝５．７０ ｐＫ３＝６．７３ ｐＫ４＝９．１５ ｐＫ５＝１１．２９应用休克分子轨道（ＨＭＯ）法，计算了不同酸度下各离子形态的π电子分布与理论的最大吸收峰波长。这些结果与试剂吸收光谱数据相比较，各级的离解常数获得了归属。
From spectrophotometric study, the acidic dissociation constants of O-hydroxyphenylfluorone (O-HPF) and m-hydroxyphenylfluorone (m-HPF) have been determined. The results may be summarized as follows: O-HPF pK1 = 2.73 pK2= 5.62 pK3= 6.39 pK, = 9.58 pK5= 11.17 m-HPF pK1 = 2.32 pK2 = 5.70 pK3 = 6.73 pK4= 9.15 pK3= 11.29 The π-electronic distributions and theoretic maximum absorption wave lengths of the ionic shape of the reagents in media of various acidity have been calculated by means or the Huckel molecular orbital (HMO) method. Comparing these results with experimental data from absorption spectra, the assignation of dissociation constants may be accom plished.
出处
《福州大学学报（自然科学版）》
CAS
CSCD
1991年第4期112-117,共6页
Journal of Fuzhou University(Natural Science Edition)
关键词
氢离解常数
萤光酮
分光光度法
acidic dissociation constant
2,3,7-trihydroxyphenylfluorone
Huckel molecu-lar method
