3089.4 Sp2 C-H stretch 2964.93 Sp3 C-H stretch 1720.23 C=O stretch, conjugated e

Question

3089.4 Sp2 C-H stretch 2964.93 Sp3 C-H stretch 1720.23 C=O stretch, conjugated ester 1615.41 C=C stretch, aromatic 1530.25 N=O asymmetric stretch?? 1445.09 C=C stretch, aromatic 1366.47 C-C rocking, methyl group 1309.96 N=O symmetric stretch?? 1261.66 Sp2 C-O stretch?? 1143.74 Sp2 C-O stretch?? 842.39 C-N stretch?? 731.02 C-H out of plane bending, m- disubstituted aromatic??
IR of Methyl Nitrobenzoate Product (NaCl press) 95 90 80.0 75 70.0 60.0 50. 45 3800 3600 3400 3200 3000 2800 2600 2400 2200 2000 1800 1600 1400 1200 1000 800 Wevenumbers (am-1)

Explanation / Answer

The IR assignments are shown below.

3089.4      aromatic C-H stretch
2964.93    Sp3 C-H stretch
1720.23    C=O stretch, conjugated ester
1615.41    C=C bending, aromatic
1530.25    N-O asymmetric stretch nitro compounds
1445.09    C=C bending, aromatic
1366.47    C-H rocking, methyl group
1309.96    N-O symmetric stretch nitro compounds
1261.66    C-O stretch esters
1143.74    C-N stretch
731.02      C–H rock alkanes

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