ࡱ> '` 0MbjbjLULU>$.?.?W.<<<<<4. j??????? ?~~~~~~~$vhނ9~?????9~??~GGG???~G?~GGsXu?> pC<DSu(uD~0 {u(vDvPuvu,??G?????9~9~G??? ????...6<...<... IR Spectroscopy Tutorial: Alkanes  The spectra of simple alkanes are characterized by absorptions due to CH stretching and bending (the CC stretching and bending bands are either too weak or of too low a frequency to be detected in IR spectroscopy). In simple alkanes, which have very few bands, each band in the spectrum can be assigned. CH stretch from 30002850 cm-1 CH bend or scissoring from 1470-1450 cm-1 CH rock, methyl from 1370-1350 cm-1 CH rock, methyl, seen only in long chain alkanes, from 725-720 cm-1 The IR spectrum of octane is shown below. Note the strong bands in the 3000-2850 cm-1 region due to C-H stretch. The C-H scissoring (1470), methyl rock (1383), and long-chain methyl rock (728) are noted on this spectrum. Since most organic compounds have these features, these C-H vibrations are usually not noted when interpreting a routine IR spectrum. The region from about 1300-900 cm-1 is called the fingerprint region. The bands in this region originate in interacting vibrational modes resulting in a complex absorption pattern. Usually, this region is quite complex and often difficult to interpret; however, each organic compound has its own unique absorption pattern (or fingerprint) in this region and thus an IR spectrum be used to identify a compound by matching it with a sample of a known compound.   IR Spectroscopy Tutorial: Alkenes  Alkenes are compounds that have a carbon-carbon double bond, C=C. The stretching vibration of the C=C bond usually gives rise to a moderate band in the region 1680-1640 cm-1. Stretching vibrations of the C=CH bond are of higher frequency (higher wavenumber) than those of the CCH bond in alkanes. This is a very useful tool for interpreting IR spectra: Only alkenes and aromatics show a C-H stretch slightly higher than 3000 cm-1. Compounds that do not have a C=C bond show C-H stretches only below 3000 cm-1.The strongest bands in the spectra of alkenes are those attributed to the carbon-hydrogen bending vibrations of the =CH group. These bands are in the region 1000-650 cm-1 (Note: this overlaps the HYPERLINK "http://orgchem.colorado.edu/hndbksupport/irtutor/alkanesir.html" \l "fingerprint" \t "_blank"fingerprint region). Summary: C=C stretch from 1680-1640 cm-1 =CH stretch from 3100-3000 cm-1 =CH bend from 1000-650 cm-1 The IR spectrum of 1-octene is shown below. Note the band greater than 3000 cm-1 for the =CH stretch and the several bands lower than 3000 cm-1 for CH stretch (alkanes). The C=C stretch band is at 1644 cm-1. Bands for CH scissoring (1465) and methyl rock (1378) are marked on this spectrum; in routine IR analysis, these bands are not specific to an alkene and are generally not noted because they are present in almost all organic molecules (and they are in the fingerprint region). The bands at 917 cm-1 and 1044cm-1 are attributed to =C&Mac173;H bends.  It is interesting to overlay a spectrum of 1-octene with octane (shown below). Note how similar they are, except for the bands due to C=C or C=CH stretches/bends.   IR Spectroscopy Tutorial: Alkynes  Alkynes are compounds that have a carbon-carbon triple bond ( Ca"C ). The  Ca"C stretch appears as a weak band from 2260-2100 cm-1. This can be an important diagnostic tool because very few organic compounds show an absorption in this region. A terminal alkyne (but not an internal alkyne) will show a CH stretch as a strong, narrow band in the range 3330-3270 cm-1. (Often this band is indistinguishable from bands resulting from other functional groups on the same molecule which absorb in this region, such as the O-H stretch.) A terminal alkyne will show a CH bending vibration in the region 700-610 cm-1. Summary: Ca"C stretch from 2260-2100 cm-1  Ca"C H: C H stretch from 3330-3270 cm-1  Ca"C H: C H bend from 700-610 cm-1 The spectrum of 1-hexyne, a terminal alkyne, is shown below. Note the C H stretch of the C H bond adjacent to the carbon-carbon triple bond (3324), the carbon-carbon triple bond stretch (2126), and the CH bend of the C-H bond adjacent to the carbon-carbon triple bond (636). The other bands noted are CH stretch, scissoring, and methyl rock bands from the alkane portions of the molecule.  IR Spectroscopy Tutorial: Alkyl Halides  Alkyl halides are compounds that have a CX bond, where X is a halogen: bromine, chlorine, fluorene, or iodine (usually Br or Cl in the organic chemistry teaching labs). In general, CX vibration frequencies appear in the region 850-515 cm-1, sometimes out of the range of typical IR instrumentation. CCl stretches appear from 850550 cm-1, while CBr stretches appear at slightly lower wavenumbers from 690-515 cm-1. In terminal alkyl halides, the CH wag of the CH2X group is seen from 1300-1150 cm-1. Complicating the spectra is a profusion of absorptions throughout the region 1250-770 cm-1, especially in the smaller alkyl halides. Note that all of these bands are in the fingerprint region. In summary, the following bands are specific to alkyl halides: CH wag (-CH2X) from 1300-1150 cm-1 CX stretches (general) from 850-515 cm-1 CCl stretch 850-550 cm-1 CBr stretch 690-515 cm-1 The spectra of 1-bromopropane and 1-chloro-2-methylpropane are shown below. Note the CBr or CCl stretches in the region 850-515 cm-1. They also show CBr or CCl wag in the region 1300-1150 cm-1.   Even though both 1-bromopropane and 1-chloro-1-methylpropane have similar spectra and the bands that distinguish one from the other are in the fingerprint region, if the two spectra are overlayed, examination of the fingerprint region readily shows that they are different compounds. (Shown below.)  IR Spectroscopy Tutorial: Aromatics  The =CH stretch in aromatics is observed at 3100-3000 cm-1. Note that this is at slightly higher frequency than is the CH stretch in alkanes. This is a very useful tool for interpreting IR spectra: Only alkenes and aromatics show a CH stretch slightly higher than 3000 cm-1. Compounds that do not have a C=C bond show CH stretches only below 3000 cm-1.Aromatic hydrocarbons show absorptions in the regions 1600-1585 cm-1 and 1500-1400 cm-1 due to carbon-carbon stretching vibrations in the aromatic ring. Bands in the region 1250-1000 cm-1 are due to CH in-plane bending, although these bands are too weak to be observed in most aromatic compounds. Besides the CH stretch above 3000 cm-1, two other regions of the infrared spectra of aromatics distinguish aromatics from organic compounds that do not have an aromatic ring: 2000-1665 cm-1 (weak bands known as "overtones") 900-675 cm-1 (out-of-plane or "oop" bands) Not only do these bands distinguish aromatics, but they can be useful if you want to determine the number and positions of substituents on the aromatic ring. The pattern of overtone bands in the region 2000-1665 cm-1 reflect the substitution pattern on the ring. The pattern of the oop CH bending bands in the region 900-675 cm-1 are also characteristic of the aromatic substitution pattern. Details of the correlation between IR patterns in these two regions and ring substitution are available in the literature references linked in the left frame (especially the books by Shriner and Fuson, Silverstein et. al., and the Aldrich Library of IR Spectra). In some instances, it is useful to remember that aromatics in general show a lot more bands than compounds that do not contain an aromatic ring. If you are presented with two spectra and told that one is aromatic and one is not, a quick glance at the sheer multitude of bands in one of the spectra can tell you that it is the aromatic compound. Summary: CH stretch from 3100-3000 cm-1 overtones, weak, from 2000-1665 cm-1 CC stretch (in-ring) from 1600-1585 cm-1 CC stretch (in-ring) from 1500-1400 cm-1 CH "oop" from 900-675 cm-1 The spectrum of toluene is shown below. Note the =CH stretches of aromatics (3099, 3068, 3032) and the CH stretches of the alkyl (methyl) group (2925 is the only one marked). The characteristic overtones are seen from about 2000-1665. Also note the carbon-carbon stretches in the aromatic ring (1614, 1506, 1465), the in-plane CH bending (1086, 1035), and the CH oop (738).  IR Spectroscopy Tutorial: Alcohols  Alcohols have characteristic IR absorptions associated with both the O-H and the C-O stretching vibrations. When run as a thin liquid film, or "neat", the OH stretch of alcohols appears in the region 3500-3200 cm-1 and is a very intense, broad band. The CO stretch shows up in the region 1260-1050 cm-1. OH stretch, hydrogen bonded 3500-3200 cm-1 CO stretch 1260-1050 cm-1 (s) The spectrum of ethanol is shown below. Note the very broad, strong band of the OH stretch (3391) and the CO stretches (1102, 1055).  IR Spectroscopy Tutorial: Ketones  The carbonyl stretching vibration band C=O of saturated aliphatic ketones appears at 1715 cm-1. Conjugation of the carbonyl group with carbon-carbon double bonds or phenyl groups, as in alpha, beta-unsaturated aldehydes and benzaldehyde, shifts this band to lower wavenumbers, 1685-1666 cm-1. See also: HYPERLINK "http://orgchem.colorado.edu/hndbksupport/irtutor/carbonylsir.html" \t "_blank"carbonyl stretching frequencies HYPERLINK "http://orgchem.colorado.edu/hndbksupport/irtutor/carbonab.html" \t "_blank"unsaturation/saturation refresher Summary: C=O stretch: aliphatic ketones 1715 cm-1 alpha, beta-unsaturated ketones 1685-1666 cm-1 The spectrum of 2-butanone is shown below. This is a saturated ketone, and the C=O band appears at 1715. Note the CH stretches (around 2991) of alkyl groups. It's usually not necessary to mark any of the bands in the fingerprint region (less than 1500 cm-1).  IR Spectroscopy Tutorial: Aldehydes  The carbonyl stretch C=O of saturated aliphatic aldehydes appears from 1740-1720 cm-1. As in ketones, if the carbons adjacent to the aldehyde group are unsaturated, this vibration is shifted to lower wavenumbers, 1710-1685 cm-1. See also: HYPERLINK "http://orgchem.colorado.edu/hndbksupport/irtutor/carbonylsir.html" \t "_blank"carbonyl stretching frequencies HYPERLINK "http://orgchem.colorado.edu/hndbksupport/irtutor/carbonab.html" \t "_blank"unsaturation/saturation refresher Another useful diagnostic band for aldehydes is the O=CH stretch. This band generally appears as one or two bands of moderate intensity in the region 2830-2695 cm-1. Since the band near 2830 cm-1 is usually indistinguishable from other CH stretching vibration bands (recall that the CH stretches of alkanes appear from 3000-2850 cm-1), the presence of a moderate band near 2720 cm-1 is more likely to be helpful in determining whether or not a compound is an aldehyde. If you suspect a compound to be an aldehyde, always look for a peak around 2720 cm-1; it often appears as a shoulder-type peak just to the right of the alkyl CH stretches.Summary: HC=O stretch 2830-2695 cm-1 C=O stretch: aliphatic aldehydes 1740-1720 cm-1 alpha, beta-unsaturated aldehydes 1710-1685 cm-1 The spectra of benzaldehyde and butyraldehyde are shown below. Note that the O=C stretch of the alpha, beta-unsaturated compound -- benzaldehyde -- is at a lower wavenumber than that of the saturated butyraldehyde. Note the O=CH stretches in both aldehydes in the region 2830-2695 cm-1, especially the shoulder peak at 2725 cm-1 in butyraldehyde and 2745 cm-1 in benzaldehyde.   IR Spectroscopy Tutorial: Carboxylic Acids  Carboxylic acids show a strong, wide band for the OH stretch. Unlike the OH stretch band observed in alcohols, the carboxylic acid OH stretch appears as a very broad band in the region 3300-2500 cm-1, centered at about 3000 cm-1. This is in the same region as the CH stretching bands of both alkyl and aromatic groups. Thus a carboxylic acid shows a somewhat "messy" absorption pattern in the region 3300-2500 cm-1, with the broad OH band superimposed on the sharp CH stretching bands. The reason that the OH stretch band of carboxylic acids is so broad is becase carboxylic acids usually exist as hydrogen-bonded dimers. The carbonyl stretch C=O of a carboxylic acid appears as an intense band from 1760-1690 cm-1. The exact position of this broad band depends on whether the carboxylic acid is saturated or unsaturated, dimerized, or has internal hydrogen bonding. See also: HYPERLINK "http://orgchem.colorado.edu/hndbksupport/irtutor/carbonylsir.html" \t "_blank"carbonyl stretching frequencies The CO stretch appears in the region 1320-1210 cm-1, and the OH bend is in the region 1440-1395 cm-1 and 950-910 cm-1, although the 1440-1395 band may not be distinguishable from CH bending bands in the same region. Summary: OH stretch from 3300-2500 cm-1 C=O stretch from 1760-1690 cm-1 CO stretch from 1320-1210 cm-1 OH bend from 1440-1395 and 950-910 cm-1 The spectrum of hexanoic acid is shown below. Note the broad peak due to OH stretch superimposed on the sharp band due to CH stretch. Note the C=O stretch (1721), CO stretch (1296), OH bends (1419, 948), and CO stretch (1296).  IR Spectroscopy Tutorial: Esters  The carbonyl stretch C=O of aliphatic esters appears from 1750-1735 cm-1; that of , -unsaturated esters appears from 1730-1715 cm-1. See also: HYPERLINK "http://orgchem.colorado.edu/hndbksupport/irtutor/carbonylsir.html" \t "_blank"carbonyl stretching frequencies The C O stretches appear as two or more bands in the region 1300-1000 cm-1. Summary: C=O stretch aliphatic from 1750-1735 cm-1 , -unsaturated from 1730-1715 cm-1 C O stretch from 1300-1000 cm-1 The spectra of ethyl acetate and ethyl benzoate are shown below. Note that the C=O stretch of ethyl acetate (1752) is at a higher wavelength than that of the , -unsaturated ester ethyl benzoate (1726). Also note the C O stretches in the region 1300-1000 cm-1.   IR Spectroscopy Tutorial: Amines  The N H stretches of amines are in the region 3300-3000 cm-1. These bands are weaker and sharper than those of the alcohol OH stretches which appear in the same region. In primary amines (RNH2), there are two bands in this region, the asymmetrical NH stretch and the symmetrical NH stretch.  Secondary amines (R2NH) show only a single weak band in the 3300-3000 cm-1 region, since they have only one NH bond. Tertiary amines (R3N) do not show any band in this region since they do not have an NH bond. (A shoulder band usually appears on the lower wavenumber side in primary and secondary liquid amines arising from the overtone of the NH bending band: this can confuse interpretation. Note the spectrum of aniline, below.) The NH bending vibration of primary amines is observed in the region 1650-1580 cm-1. Usually, secondary amines do not show a band in this region and tertiary amines never show a band in this region. (This band can be very sharp and close enough to the carbonyl region to cause students to interpret it as a carbonyl band.) Another band attributed to amines is observed in the region 910-665 cm-1. This strong, broad band is due to NH wag and observed only for primary and secondary amines. The CN stretching vibration of aliphatic amines is observed as medium or weak bands in the region 1250-1020 cm-1. In aromatic amines, the band is usually strong and in the region 1335-1250 cm-1. Summary: NH stretch 3400-3250 cm-1 1 amine: two bands from 3400-3300 and 3330-3250 cm-1 2 amine: one band from 3350-3310 cm-1 3 amine: no bands in this region NH bend (primary amines only) from 1650-1580 cm-1 CN stretch (aromatic amines) from 1335-1250 cm-1 CN stretch (aliphatic amines) from 12501020 cm-1 NH wag (primary and secondary amines only) from 910-665 cm-1 The spectrum of aniline is shown below. This primary amine shows two NH stretches (3442, 3360); note the shoulder band, which is an overtone of the NH bending vibration. The CN stretch appears at 1281 rather than at lower wavenumbers because aniline is an aromatic compound. Also note the NH bend at 1619.  The spectrum of diethylamine is below. Note that this secondary amine shows only one NH stretch (3288). The CN stretch is at 1143, in the range for non-aromatic amines (1250-1020). Diethylamine also shows an NH wag (733).  Triethylamine is a tertiary amine and does not have an NH stretch, nor an NH wag. The CN stretch is at 1214 cm-1 (non-aromatic).  IR Spectroscopy Tutorial: Nitro Groups  The NO stretching vibrations in nitroalkanes occur near 1550 cm-1 (asymmetrical) and 1365 cm-1 (symmetrical), the band at 1550 cm-1 being the stronger of the two. If the nitro group is attached to an aromatic ring, the NO stretching bands shift to down to slightly lower wavenumbers: 1550-1475 cm-1 and 1360-1290 cm-1. Summary: NO asymmetric stretch from 1550-1475 cm-1 NO symmetric stretch from 1360-1290 cm-1 Compare the spectra of nitromethane and m-nitrotoluene, below. In nitromethane, the NO stretches are at 1573 and 1383, while in nitrotoluene, they are a little more to the right, at 1537 and 1358.   IR Spectroscopy Tutorial: How to analyze IR spectra  If you have followed this tutorial group-by-group, you will realize that in even rather simple, mono-functional molecules there are so many IR bands that it is not feasible to assign every band in an IR spectrum. Instead, look for tell-tale bands -- the region from 4000-1300 cm-1 is particularly useful for determining the presence of specific functional groups. You can rely on the HYPERLINK "http://orgchem.colorado.edu/hndbksupport/specttutor/irchart.html" \t "_blank"IR correlation charts (linked in the left frame), but we recommend (in fact, in organic chem 1 lab, we require) that you memorize the distinctive bands of the common functional bands: 3500-3300 cm-1NH stretch1&Mac251;, 2&Mac251; amines3500-3200 cm-1OH stretchalcohols, a broad, strong band3100-3000 cm-1CH stretchalkenes3000-2850 cm-1CH stretchalkanes1760-1665 cm-1C=O stretchketones, aldehydes, esters1680-1640 cm-1C=C stretchalkenesBegin by looking in the region from 4000-1300. Look at the CH stretching bands around 3000: Indicates:Are any or all to the right of 3000?alkyl groups (present in most organic molecules)Are any or all to the left of 3000?a C=C bond or aromatic group in the moleculeLook for a carbonyl in the region 1760-1690. If there is such a band: Indicates:Is an OH band also present?a carboxylic acid groupIs a CO band also present?an esterIs an aldehydic CH band also present?an aldehydeIs an NH band also present?an amideAre none of the above present?a ketone(also check the HYPERLINK "http://orgchem.colorado.edu/hndbksupport/irtutor/carbonylsir.html" \t "_blank"exact position of the carbonyl band for clues as to the type of carbonyl compound it is) Look for a broad OH band in the region 3500-3200 cm-1. If there is such a band: Indicates:Is an OH band present?an alcohol or phenolLook for a single or double sharp NH band in the region 3400-3250 cm-1. If there is such a band: Indicates:Are there two bands?a primary amineIs there only one band?a secondary amineOther structural features to check for: Indicates:Are there CO stretches?an ether (or an ester if there is a carbonyl band too)Is there a C=C stretching band?an alkeneAre there aromatic stretching bands?an aromaticIs there a Ca"C band?an alkyneAre there -NO2 bands?a nitro compoundIf there is an absence of major functional group bands in the region 4000-1300 cm-1 (other than C H stretches), the compound is probably a strict hydrocarbon. Also check the region from 900-650 cm-1. Aromatics, alkyl halides, carboxylic acids, amines, and amides show moderate or strong absorption bands (bending vibrations) in this region. As a beginning student, you should not try to assign or interpret every peak in the spectrum. Concentrate on learning the major bands and recognizing their presence and absence in any given spectrum.In the organic chem teaching labs, you usually know what compound you started with and what compound you are trying to make. For instance, if you are oxidizing an alcohol to a ketone, your product should show a carbonyl band but no hydroxyl band. If no carbonyl band is present, the experiment was not successful. If both carbonyl and hydroxyl bands are present, the product is not pure. Spectroscopy Tutorial: Reference  Table of Characteristic IR Absorptions You can download this chart as a HYPERLINK "http://orgchem.colorado.edu/hndbksupport/specttutor/irchart.pdf"printable acrobat pdf file. frequency, cm1bondfunctional group36403610 (s, sh)!"#jms u b d = > ? @ A b ӾrWB)j=hTBh8NCJOJQJU^JaJ4jhDh8NCJOJQJU^JaJmHnHu&h2h8N5CJOJQJ\^JaJ#h2h8NCJH*OJQJ^JaJ)h2h8NB*CJOJQJ^JaJph h2h8NCJOJQJ^JaJ)jhTBh8NCJOJQJU^JaJ&h2h8N5CJOJQJ\^JaJ/h2h8N5B* CJOJQJ\^JaJphf"$V w  r = ? 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