IR Spectrum of Octane wavelength (um) 2.5 3 3.5 4 4.5 5 5.56 7 8 9 10 11 1213141516 10 (b) 80 CH2 CH3 rock rock 60 CH2 -FF scissor C-H stretch CH:(CH2)CH; 20 n-octane 0 4000 3500 3000 2500 200018001600140012001000 800 600 wavenumber(cm) fingerprint region
IR Spectrum of Octane
Decane 100 CH3(CH2)1oCH3 2370 50 2953 In-plane bending In-plane bending or scissoring (o.CH2) or rocking (p CH2) 3 -1465cm ~720 cm 4000 3000 2000 1000 Wavenumbers(cm)
Decane
2,2,4-Trimethylpentane 100 CH3 CH3 CH3-CH-CHz-C-CH3 50 CH3 3.70 0 4000 3000 2000 1000 Wavenumbers(cm)
2,2,4-Trimethylpentane
Hybridization of Carbon Affects v of Absorption sp hybridized,one-fourth s character 2800-3000cm- sp2 hybridized,one-third s character 3000-3100cm-J -C=C-H sp hybridized,one-half s character 3300cm-1
Hybridization of Carbon Affects n of Absorption
Hexane and Hexene wavelength (um 35 44.5 55.5 6 910 1213141516 80 60 40 FFE4z-FF4ZO C-H bending CH(CH,).CH, C一H stretch (a)n-hexane 4000 3500 3000 2500 200018001600 140012001000 800 600 wavenumber(cm） wavelength(μm) 3.5 4.5 5.5 6 8 910 11 12 13141516 00 CH(CH)CH=CH 60 3080 (b)1-hexene =C一H stretch alkane C-H stretch 1642 C=C stretch C-H bending 计 4000 3500 3000 2500 200018001600140012001000 800 600 wavenumber(cm-)
Hexane and Hexene