摘要
首次报告了２、６、７三羟基－９－（对氯）苯基荧光酮的合成文法．用分光光度法测出这个试剂共有四级的离解常数：ｐＫ１＝ ２．１４，ｐＫ２＝５．８６，ｐＫ３＝８．７９．ｐＫ４＝ １１．６８．应用休克分子轨道法．对不同酸度下存在的离子形式进行研究．从中性分子的－电荷密度分布大小，对四级离解常数进行归属，同时通过各离子形式的吸收峰波长的计算值与实测的实验值对照，进一步确认离解常数归属的合理性与可靠性．得出四级离解常数所联系的平衡形式。
The synthetic method or 2, 6, 7-trihydroxyl-9-(4'chlorophenyl)-3-fluorone is re- ported. The acidic dissociation constants of this reagent have been determined from spectrophometic data. These results may be summarized as follows: pK1=2.14, pK2= 5.86, pK3= 8.79, pK4=11.68. The ionic shapes of this reagent in media of various acidity have been studied by using Huckel molecular orbital (HMO) method. From distribu- tion of -electron, dissociation constants have been assigned. Comparing the experimental values with the theoretical values of maximum absorptive wave length, we can confirm that assignation of dissociation constants is reasonable.
出处
《福州大学学报（自然科学版）》
CAS
CSCD
1990年第3期104-107,共4页
Journal of Fuzhou University(Natural Science Edition)
关键词
有机试剂
对氯苯芴酮
离解
合成
acidic dissociation constant
organic reagent
Huckel molecular orbital method
