Number on graph peaks from left to right: Figure 8.2 IR spectrum of salicylamide
ID: 1052576 • Letter: N
Question
Number on graph peaks from left to right:Figure 8.2 IR spectrum of salicylamide Table 8.1. Fingerprint Infrared Absorptions for Substituted Aromatics Ring substitution pattern Espected peaks (em Monosubstituted Substitution Pattern Eample a770-715 (strong) 770-730 (strong 20-760 (strong) 1,2-Disubstituted 1,3-Disubstituted 1.4-Disubstituted 870-500 (strong) 1,2,3-Trisubstituted 790-750 (strong) 1,2,4-Trisubstituted 850-800 (strong) 1,3,5-Trisubstituted 910-830 (strong The numbers here apply to substitution patterns, not nomenclature
Explanation / Answer
Salicylamide is an aromatic compound that has substitution at the ortho position.
It has an amide functiona group and it is expected to have a strong peak at 1640-1690 cm-1. The given spectra has that peak at 1671 cm-1
Unsubstituted amides should have a peak at 3100-3500cm-1 and the spectra given above also has asymmetric doublet 3397cm-1
NH bending at 1550-1640 cm-1 should be seen. Interestingly the spectra given also has that at 1630cm-1
According to the above table, it should a stron absorption frequency in the range of 770-730cm-1 (1,2 disubstituted). Noteworthy that there is a strong peak at 750cm-1 in the given spectra too.
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