Frequencies on ATR-FTIR spectra (cm1)

Assignment of bonds

Mode of vibration

CARVACROL

810 - 807

C-H out-of-plane

wagging

1125 - 1085

ortho-substitution,

-

995 - 990

1:2:4-Substituion

-

1380, 1360

isopropyl group

symmetric and asymmetric bending

1520 - 1513

C-H (CH3)

waging

1600, 1580, 1500

C=C

stretching

3000 - 2850

C-H

symmetric and asymmetric stretching

3360 - 3330

-OH

stretching

THYMOL

806 - 804

C-H out-of-plane

waging

1045, 1003

1:3:4-substitution

-

1170 - 1140

meta-substitution

-

1380, 1360

isopropyl group

symmetric and asymmetric bending

1520 - 1513

C-H (CH3)

waging

1600, 1580, 1500

C=C

stretching

3000 - 2850

C-H

symmetric and asymmetric stretching

3360 - 3330

-OH

stretching

P-CYMENE

812 - 811

CH-out-of-plane

waging

1055, 1019

para-substitution

-

1380, 1360

isopropyl group (-CH-CH3CH3)

symmetric and asymmetric bending

1515 - 1513

C-H (CH3)

waging

3000 - 2850

C-H

symmetric and asymmetric stretching