1st picture is of the acid, 2nd is the base
% Transmittance 10 65 70 5 4000 75 80 85 06 95 ACID 3500 3071.42 3000 2827.58 2554 61 2500 Wavenumbers (cm-1) 2000 1915.45 1678.52 009 1496.42 1601.08 1582.75 1453.08 1420 59 1323.62 1288.98 1127.73 1185.04 1101.00 1072.72 1026 60 1000 100008 93221 804.95 703.82 683 63 686 30 % Transmittance -0 10 30 35 5 8 8 8 8 4000 BASE 3500 3368.02 3201.31 3000 3033.87 2500 Wavenumbers (cm-1) 2000 2161.33 1886.44 1613.84 1500 151381 1261.74 1330.40 1293.OZ 1179.18 1145,88 1098.98 1032.93 1017.98 956 19 1000 865.57 830.91 813.96 734 97 70272 4. IR Analysis Analyzing your spectra, make sure that: All signals are labeled on IR (functional groups, molecular motions) Structures of compounds are drawn on spectra enabling signal identification Acid functional group Molecular motion Observed wavenumber [cm'' Literature value (range) [em') Peak intensity Peak shape Base functional group Molecular motion Observed wavenumber(cm'1 Literature value (range) [em') Peak intensity Peak shape Infrared absorption bands and corresponding molecular motions found in common functional groups 3600 3550 - 3500 1300 - 1000 ALCOHOLS AND PHENOLS Alcohol O-H stretching Phenol O-R stretching C-o stretching ETHERS C-O-stretching 1100 Wavenumber Assignment (cm) and molecular motion ALKANES 2960 Mothyl symmetric C-H stretching 2930 Methylene asymmetric C-H stretching 2870 Methyl asymmetric C-H stretching 2850 Methylone symmetric C-H stretching 1470 Methyl asymmetrical C-H bending 1485 Methylone scissoring 1380 Methyl symmetrical C-H bending 1305 Methylene wagging 1300 Methylene twisting 720 Methylone rocking 2900-2700 1740 - 1720 1730-1700 ALDEHYDES AND KETONES Aldehyde C-H stretching Alphatic aldehyde C. stretching Alphasic ketone CO stretching Aromatic aldehydo CEO stretching Aromatic ketone 2.0 stretching 1720 - 1680 1700 - 1680 3100 - 3000 1680-1600 1400 1000 - 600 ALKENES =C-H stretching CEO stretching -CHin-plane bending -C-Hout-of-plane bending 1750-1730 1730 - 1705 1310 - 1250 1300-1100 ESTERS Aliphatic C=0 stretching Aromatic CeO stretching Aromatec O stretching Alphesc C- stretching 3300-3250 2280-2100 700-600 ALKYNES =C-H stretching CHC stretching =C-H bending 3300-2500 1700 1430 1240 330 CARBOXYLIC ACIDS O-H stretching CEO stretching C-O-Hin-plano bonding C-stretching c-O-Hout-of-plane bending 3100 - 3000 2000 - 1700 AROMATICS C-H stretching overtone and combination bands C=C stretching In-plane C-H bending Out-of-plano C-H bonding 1600 - 1430 1275 - 1000 900 - 630 1840-1800 1780-1740 1300-1100 ANHYDRIDES CO stretching CEO stretching C-o stretching ACYL HALIDES C-O stretching symmetric stretching Oxime N-stretching Norte N-o stretching Nitrato NO2 bonding 986 - 930 870-840 710-690 1810-1800 1300-1000 800-400 3335 2780 1615 1360-1250 1210-1020 850-750 AMINES N-H stretching N-CH stretching NH, scissoring, N-H bending Aromatic C-N stretching Aliphatic C-N stretching NH, wagging and twisting N-H wagging HAUDES C-F wretching C-X stretching DX = F.OLBOX 1) 715 3360 - 3340 3300 - 3250 3190-3170 AMIDES 1. Amide NH, asymmetric stretching 2 arride N H stretching 1. amide NH symmetria stretching 1' amid CHO stretching 2 amide - stretching 19 amide NH, bending 2 amide N-H bending C-N stretching 2 amide N-H wagging 1680 - 1660 1680-1640 1650-1620 1560 - 1530 750 - 650 2260-2240 2240 - 2220 2180 - 2110 2160 - 2120 2130-2100 1690- 1620 1680-1650 1600 - 1620 NITROGEN-BASED GROUPS Aliphatio nitrie Can stretching Aromatic nitrile CaN stretching Aliphatic isonitrile-NEC stretching Aride NuN stretching Aromatic isonitrile-NC stretching Oxime C-N-OH stretching Nitrite N. stretching Ntrate NO, asymmetric stretching Aliphatic nitro compound NO, asymmetric stretching Aromatic nitro compound NO. asymmetric stretching Azo compound Ne stretching Alphatid nitro compound NO, symmetric stretching Aromatic nitro compound NO. 1560 - 1530 1540 - 1500 1450-1400 1390 - 1370 1370 - 1330
