厦门大学化学化工学院：《有机化学》课程教学资源（授课教案）第十八章 有机波谱 Spectroscopy Spectroscopy

第十八章有机波谱 Spe

第十八章 有机波谱 Spectroscopy Spectroscopy

红外光谱仪 红外光谱

Organic Chemistry Organic Chemistry Xiamen Xiamen University University 18.1 红外光谱

Synchronous motor Chart Synchronous motor Reference Attenuator 人 IR Source Grating Detector Chopper ①D Sample Monochromat ⑨D Filter odulat Pre amplifier Synchronous amp rectifier

Organic Chemistry Organic Chemistry Xiamen Xiamen University University

f(m1+ mo 12 2TC m1×m2 nnu e v=the frequency in cm-l f= the force constant a c=the velocity of light ⑨D

Organic Chemistry Organic Chemistry Xiamen Xiamen University University f(m 1+ m 2 ) m 1 × m 2 ν ~ = 2 π c 1 ν ~ = the fr equen cy i n c m-1 f = the fo rce c onstant c = th e v elo c ity o f ligh t

L振动类型 Stretching(伸缩振动 _ Bending(弯曲振动)

Organic Chemistry Organic Chemistry Xiamen Xiamen University University 振动类型 振动类型 Stretching( Stretching(伸缩振动 伸缩振动 )) Bending ( Bending (弯曲振动 弯曲振动 ))

Yaye umber cm 4000 5000 2500 2000 150 3012001100 R-0一H R一N一H R -C≡H ①D wavelength, micron ⑨D

Organic Chemistry Organic Chemistry Xiamen Xiamen University University

Bond O-H N一H C-H ≡C-H C-H C≡N C≡C C=C 1620~1680 C=0 1630~1780 Aromatic ring 1500and1650~1550

Organic Chemistry Organic Chemistry Xiamen Xiamen University University 1630 ~ 1780 3590 ~ 3650 Frequency Range (cm-1 Bond ) Aromatic ring 1500 and 1650 ~ 1550 1620 ~ 1680 2100 ~2200 2220 ~ 2260 3010 ~ 3095 ~ 3300 2853 ~ 2962 3300 ~ 3500 O H C O C C C C C N C H C H N H C H

Frequency [Cm1) ③20,111,12,1 ASSIGNMENTS 3350oH· Stretch 2950-CH Aliphatic Stretch 2860-CH Aliphatic Stretch 3350 1425-CH Bending 1425 1065. co Stretch 2860 1065 ①D 2950 ⑨D

Organic Chemistry Organic Chemistry Xiamen Xiamen University University

18.1.1 Hydrocarbons 100 1985 1417 9938912 1825 3080 sp'C-H stretching 1465 993 2965 asymmetric CH 2932 asymmetric CH 2876 symmetric CH3 1643 2845 symmetric CH2 92 1-Pentene CH3 CH2 CH2 CH=CH2 er cr

18.1.1 Hydrocarbons

18681750 Overtones 1170 spC-H stretch 1085 3062 2920 1030 8gcE销cm 1605 rIno 1496 696 Toluene -CH 729 4000 1500