Excited-state Reactions of Coumarins in Aqueous Solutions. I. The Phototautomerization of 7-Hydroxycoumarin and Its Derivative

化学 4-羟基香豆素 水溶液 衍生工具(金融) 激发态 香豆素 光化学 计算化学 有机化学 原子物理学 物理 金融经济学 经济 催化作用
作者
Tetsuo Moriya
出处
期刊:Bulletin of the Chemical Society of Japan [Oxford University Press]
卷期号:56 (1): 6-14 被引量:86
标识
DOI:10.1246/bcsj.56.6
摘要

Abstract The kinetics and mechanism of the reaction in the photo-excited state of 7-hydroxycoumarin and its derivative have been studied in aqueous solutions by means of measuring the fluorescence spectra and the fluorescence lifetime. The four fluorescence bands have been identified as emissions from the neutral, anionic, tautomeric, and cationic forms of 7-hydroxycoumarins. The quantitative analysis was performed by using the rate equation which included the term for the direct conversion of the excited neutral molecule to its tautomer in addition to the usual reaction term of dissociation. The rate constants of the tautomerization and dissociation were discussed in detail, and it was revealed that the tautomerization in aqueous solutions was mainly caused by the transfer of a proton between two active sites in the molecule. Such an intramolecular proton-transfer of the coumarins, found first in this paper, is considered to be promoted by water molecules with a hydrogen bond surrounding the excited molecule.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
dongdong发布了新的文献求助10
刚刚
刚刚
时臣的错完成签到,获得积分10
刚刚
1秒前
梦伶发布了新的文献求助50
1秒前
1秒前
郭小宝发布了新的文献求助10
2秒前
DrCoLd发布了新的文献求助10
2秒前
杜科研完成签到,获得积分10
2秒前
刘阳完成签到,获得积分10
2秒前
clairr发布了新的文献求助30
4秒前
Ren应助左左采纳,获得10
4秒前
4秒前
丙子哥完成签到,获得积分10
5秒前
5秒前
无花果应助科研通管家采纳,获得10
5秒前
倪小呆发布了新的文献求助10
5秒前
研友_VZG7GZ应助科研通管家采纳,获得10
5秒前
我是老大应助科研通管家采纳,获得10
5秒前
岳岳完成签到,获得积分10
5秒前
5秒前
坦率的匪应助科研通管家采纳,获得10
5秒前
5秒前
脑洞疼应助科研通管家采纳,获得20
6秒前
MchemG应助科研通管家采纳,获得10
6秒前
无花果应助科研通管家采纳,获得10
6秒前
6秒前
完美世界应助科研通管家采纳,获得10
6秒前
华仔应助科研通管家采纳,获得10
6秒前
李健应助科研通管家采纳,获得10
6秒前
6秒前
爆米花应助科研通管家采纳,获得10
6秒前
科研通AI2S应助科研通管家采纳,获得10
6秒前
7秒前
橘子海完成签到,获得积分20
7秒前
7秒前
7秒前
7秒前
7秒前
momo应助科研通管家采纳,获得10
7秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3988827
求助须知:如何正确求助?哪些是违规求助? 3531183
关于积分的说明 11252671
捐赠科研通 3269809
什么是DOI,文献DOI怎么找? 1804780
邀请新用户注册赠送积分活动 881885
科研通“疑难数据库(出版商)”最低求助积分说明 809021