Table 1.

Assignment of the most characteristic bands in the FT-IR transmittance spectra of L. nobilis L. EOs based on literature [23,24,25] and spectra of reference compounds.

Wavenumber (cm−1)		Assignment	Relevant Constituent(s)
Zero order Spectrum	2nd Derivative Spectrum
Characteristic group vibrations
3440	-	vs(OH)	linalool, terpinene-4-ol, α-terpineol
3073; 2985 (sh)	3075; 2986	vs(=CH2 mono, 1,1) or vas(CH2) in cyclopropyl rings	methyleugenol α-, β-pinene, sabinene, spathulenol, linalool, limonene
2965; 2879	2967; 2879–2870	vas(CH3)	1,8-cineole α-, β-pinene, sabinene, linalool, terpinene-4-ol
	2947–2945	νs(CH3–C=) or (CH3)2–C–electronegative or (CH2) in cyclobutane	1,8-cineole, other unidentified
2925; 2853 (sh)	2924; 2853	vs(CH2)	sabinene, linalool, β-pinene 1,8-cineole
2834 (sh)	2833	(Ar–CH2–O) or Ar–OCH3	methyleugenol, eugenol
2724	2725	–CHO	unidentified
1730	1732	ν(C=O)	α-terpinyl, bornyl, linalyl acetates
	1713–1695	–C=O–OH or aryl –C(H)=O	alkyl ketones (cyclic), aryl aldehydes
1655–1640 (br)	1660–1630	v(C=C) isolated or cyclic	sabinene, linalool, methyleugenol
1514	1516–1514	v(C=C) (ring)	methyleugenol, eugenol, p-cymene
1440–1510	1467–1465	v(C=C–C) (ring) or δ(CH2)	methyleugenol, eugenol p-cymene
Skeletal vibrations
1446	1445;1433	δs(CH2) cyclopropyl, cyclobutyl	sabinene, spathulenol, α-, β-pinene
1375–1363	1377; 1364–1360	vs(CH3–C=O) δs(CH3) gem	1,8-cineole, α-terpinyl acetate
1259; 1167–1155	1262–1258; 1155	vas(C–O–C) aromatic vs(C–O–C) aromatic v(O=C–O)	methyleugenol, eugenol acetate esters
1080	1080	v(C–O–C)	1,8-cineole
1032 (sh)	1033–1031	vas(CH2–O–C=O)	acetates of primary alcohols
1018	1017		α-pinene, γ-terpinene
995	985	δ(C–H)	1,8-cineole
	920–916	(CH3)3–C–O or 5-membered cyclic ethers
	887	ω (C–H) γ (=CH2)	pinene limonene
	843
	816	ω (C–H)	p-cymene
	801–797	δ(sp2 C–H)
	770–764	δ(sp2 C–H)

ν, stretching vibration; δ, in plane deformation vibration; γ, out of plane deformation vibration ω, wagging vibration; sh, shoulder; br, broad.