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요약정보
酚酞衍生物的合成及其变色反应 / Synthesis of Phenolphthalein Derivatives and Their Color Change Reaction
Resource Type
Academic Journal
Authors
申杨
;
朱涵熙
;
程立言
;
庄俊鹏
;
王涛
;
Yang Shen
;
Hanxi Zhu
;
Liyan Cheng
;
Junpeng Zhuang
;
Tao Wang
Source
大学化学 / University Chemistry
. 38(5):202-210
Subject
酚酞衍生物
变色反应
紫外-可见光谱
给电子效应
Language
Chinese
ISSN
1000-8438
Online Access
Find it @ DONGA
초록
为了提高化学及相关专业高年级本科生有机化学实验的综合技能,本文设计了酚酞衍生物的合成、分离、紫外光谱的测定以及趣味变色的综合实验.分别通过四种苯酚的衍生物,在甲基磺酸中与邻苯二甲酸酐反应合成了酚酞衍生物,通过中和、萃取、抽滤、旋蒸、重结晶等基本有机合成的操作分离提纯.酚酞衍生物的乙醇溶液均是无色的,但随着取代基的变化,酚酞衍生物的碱性水溶液的颜色从红色向蓝色逐渐过渡.这一现象清楚地表明了取代基的给电子效应使得酚酞碱式结构的紫外最大吸收波长发生了明显的红移.酚酞衍生物在pH<0的强酸溶液中显色,而在pH>12的强碱性水溶液中是无色的,这与酚酞在不同pH下的分子结构密切相关.本实验用Gaussian软件优化了不同pH条件下酚酞衍生物的结构,探讨了酚酞衍生物的分子结构和颜色之间的关系.最后利用酚酞的酸碱变色反应,设计了多组趣味实验,让学生深刻体会化学实验中的学以致用和寓教于乐.
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