文档介绍：第十章一、红外谱图解析红外吸收光谱analysisofinfraredspectrograph分析二、未知物结构确定infraredabsorptionstructuredeterminationofspec-troscopy,(CH3,CH,,CH)(C-C,C--H)61460cm3000cm1CHδ1380cm-1重叠CH2。1465cm1CH,r720cm1(面内摇摆)(CH)nCH2对称伸缩2853cm1±10n>4CH3对称伸缩2872cm1±10CH不对称伸缩2926cm1±10CH3不对称伸缩2962cm1±105:02:28a)由于支链的引入,H1385-1380cm1155cm1CH1:11372-1368cm1170cmCH1405-1385cm1C-CHCH1372-1365cm1250cm1c)当-CH3与O,N等电负性高的原子相连时,其对称伸缩振频率低移,强度降低约4倍;而对称变形振动频率升高,强度增加约13倍。OCH3v2850~2810,81470~1440:NCH3v2820~2760,δ1450~143815:02:28d)CH2面内变形振动(CH2),证明长碳链的存在n=1770~785cm1(中)n=2740~750cm1(中)n=3730~740cm1(中)m4720cm1(中强)e)CH2和CH3的相对含量也可以由1460cm-1和1380cm-的峰强度估算强度正庚烷正十二正二十八烷烷150014001300cm1150014001300cm1150014001300cm115:02:28100聚丙烯OR2000Wavenumbers(cm-15:02:280090840305:02:28Wavenumbers正已烷C一H弯曲报动7c-H伸缩振动CHI(CH)c|cIH101**********:02:,炔烃=C-HCH伸缩CH变形振动振动C=Ca)C-H伸编振动(>3000cm1)HCHcU(C-H)3080cm3030cm-13080-3030cm-13080cmC-CH23030cm-1CH3300cm-13000cm129002800cm15:02:28b)C=C伸缩振动(1680-1630cm1)RU(c-c)反式烯三取代烯1680-1665cm1R四取代烯弱,尖R2分界线1660cmR顺式烯乙烯基烯1660-1630cm1亚乙烯基烯H中强,尖5:02:28总结i分界线1660cm1ⅱ顺强,反弱i四取代(不与O,N等相连)无U(c=c)峰iv端烯的强度大V共轭使U(C=C)下降20-30cmH-C=C-R0c=C2140-2100cm1(弱)R1C=CR21c=c22060-2190cm(5)5:02:28