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chromatography第六节黄酮类化合物的结构研究一、紫外光谱在黄酮类化合物结构研究中的应用（一）黄酮类化合物在甲醇溶液中的紫外（UV）光谱特征
O
O
黄酮类化合物结构中的交叉共轭体系
O
O
苯甲酰基系统带II240280
m1黄酮和黄酮醇
O
桂皮酰基系统带I300400
m
O
OH
O
O
黄酮共同特点：带I、带II均为强峰区别：黄酮带I304350
m统连有助色团OH）
黄酮醇
带II
250280
m
黄酮醇带I358385
m（带Ⅰ红移，因桂皮酰系
8
fB环含氧取代对带I的影响
OHHOO
HOOOHOHOHO
HO
OOHOHOHO
OHOHO
红移357
mA环含氧取代对带II的影响
HOOHO
红移367
m
O
370
m
HOO
HO
O
OH
O
OH
O
红移252
m2、异黄酮及二氢黄酮（醇）
O
红移262
m
O
274
m
二r