IR_Absorption_Table_2009

IR_Absorption_Table_2009 - CHM!2201 Organic!Chemistry!Lab!I...

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Unformatted text preview: CHM!2201! Organic!Chemistry!Lab!I! ! Fall!2009! ! Department!of!Chemistry! Villanova!University! Infrared!Absorption!Bands! ! ! Important!OH,!NH!and!CH!Single!Bond!Stretching!Absorptions! Bond!Type! O"""""H! N"""""H! O"""""H! spC"""""H! sp C"""""H! sp3C"""""H! O! ! Family ! Alcohols! Amines,!amides! Carboxylic!acid! Alkyne! Alkene,!aromatic! Alkane! Aldehyde! Frequency!Range,!! cm"1! 3600!– 3200 3500!–!3200!! 3300!–!2500! 3320!– 3300 3100!–!3000! 3000!–!2800!! 2850!–!2700!! Comments ! Strong,!broad! Weak – medium.!!1°:!2!bands;!2°:!1!band;! 3°:!no!bands! Strong;!very!broad.!!Usually!strongest!at! ~3000!with!gradual!tapering!to!2500! Strong!–!medium! Medium!– weak.!May!be!shoulder!on! stronger!sp3C"H!band! Weak"medium.!!Intensity!proportional!to! number!of!C"H!alkane!bonds! Weak!to!medium,!usually!two!sharp!bands! ! 2 !!R—C"""""H! ! ! Important!CC!and!CN!Triple!Bond!Stretching!Absorptions! Bond!Type! C!!C! C!!N! Family ! Alkyne! Nitrile! Frequency!Range,! cm"1! 2260!–!2100! 2260!–!2220!! Comments ! Weak!–!medium!!! Medium! ! ! Important!CC,!CN!and!CO!Double!Bond!Stretching!Absorptions! Bond!Type! O! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Family ! Aldehyde! Ketone! Carboxylic!Acid! ! Ester! Amide! Imine! Alkene! Aromatic! Frequency!Range,! cm"1! 1740!–!1685! 1750!–!1660!! 1725!–!1665! 1775!–!1715! 1695!–!1615!! 1650!–!1550!! 1680!–!1600!! ~1600!and ~1500!–!1430! Comments ! Strong! Strong! Strong! Strong! Strong! ! Medium! Medium!–!weak;!narrow! Medium!–!weak!! !!R—C"""""H! O! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!R—C"""""R! O! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!R—C"""""OH! O! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!R—C"""""OR! O! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!R—C"""""N! N! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!R—C"""""R’! C!!C! ! ! Page!1!of!2! TMBare!(9/21/2009)! ! CHM!2201! Organic!Chemistry!Lab!I! ! Fall!2009! ! Department!of!Chemistry! Villanova!University! ! Infrared!Absorption!Bands! ! Important!CO!Single!Bond!Stretching!Absorptions! Bond!Type! RH2C"""OH! R2HC"""OH! R3C"""OH! O! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Family ! Primary!Alcohol! Secondary!Alcohol! Tertiary!Alcohol! Phenol! Ester! Frequency!Range,! cm"1! 1075!–!1000! 1130!–!1000!! 1210!–!1100! 1260!–!1180! 1310!–!1160! Comments ! Strong!–!medium!! Strong!–!medium!! Strong!–!medium!! Strong! Strong,!broad! ! !!!!!R—C"""""OR! ! Important!CH!Bending!Absorptions! Bond!Type! sp3C"""""H!!!! RCH!!CH2! R2C!!CH2! cis"RCH!!CHR’! trans"RCH!!CHR’! R2C!!CHR’! ! ! ! ! Family ! Alkane! Monosubstituted! Alkene! Disubstituted! terminal!Alkene! cis"Alkene! trans"Alkene! Trisubstituted! Alkene! Monosubstituted! Benzene! ortho"Disubstituted! Benzene! meta"Disubstituted! Benzene! Para"Disubstituted! Benzene! Frequency!Range,! cm"1! 1480!– 1430 1395!–!1340!!! 997!– 985! and 915!"!905! 895!–!885! 730!–!665! 980!–!960! 840!–!790! 770!– 730!!and 720!–!680! 770!–!735! 810!–!750!!and! 725!"!680! 860!"!800! Comments ! Weak!–!medium!! Medium! Usually!strong! Usually!strong! Usually!strong! Usually!strong! Usually!strong! Usually!strong! Usually!strong! Usually!strong! ! Miscellaneous!Diagnostic!Absorptions! Bond!Type! ! ! Family ! Monosubstituted! Benzene! ortho " Disubstituted! Benzene! meta " Disubstituted! Benzene! para"Disubstituted! Benzene! Frequency ! Range,!cm"1! 2000!–!1600! 2000!–!1600! Typical!Absorption! Pattern! Comments ! Weak;!multiple!bands.! Not!always!present.!! Weak;!multiple!bands.! Not!always!present.!! Weak;!multiple!bands.! Not!always!present.!! Weak;!multiple!bands.! Not!always!present.!! 2000!–!1600! 2000!–!1600! ! ! ! Page!2!of!2! TMBare!(9/21/2009)! ! ...
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This note was uploaded on 02/20/2012 for the course CHE 118B 118 taught by Professor Nasiri during the Winter '11 term at UC Davis.

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