Table 2 FT-IR spectroscopy of methanol extract of C. vulgaris

2926.01

Amine salts

N–H

2854.65

Amine salts

N–H

2358.94

Carbon dioxide

O=C=O

1728.22

Aldehyde

C=O stretching

1710.86

Aliphatic ketone

C=O stretching

1467.83

Alkene methylene group

C–H bending

1444.68

Alkene methyl group

C–H bending

1379.10

phenol

O–H bending

1274.94

Aromatic ester

C–O stretching

1261.45

Alkyl aryl ether

C–O stretching

1018.41

Sulphoxide

S=O

802.39

Alkene

C=C bending

763.91

Halo compound

C–Cl stretching

750.31

Mono-substituted

C–H bending