Table 2: Ft-ir and Raman Assignment for 4-Ethoxy-Cinnamic Acid.

Assignments FT-IR Raman Assignments FT-IR Raman
νC‒Η (aryl) 3037 vw - β=C‒Η 1213 vs 1208 m
γΟΗ 3200-2600 w, br - ωCH3 1174 vs 1169 vs
νC‒Η (sp3) 2974 m
2928 m
2887 m		 - ρCH2 1157 m -
νC=Ο 1676 vs - βO‒Η 1117 s 1114 w
νC=C (alkene) 1622 s 1626 s νO‒CH2 1045 s 1049 w
νC‒C (aryl) 1600 vs 1597 vs γ=C‒Η (trans) 980 s 981 w
νC‒C (aryl) 1573 s 1575 m βC‒Η 942 m
νC‒C(aryl) 1510 vs γC‒Η 858 w 861 w
νC‒C (aryl) 1475 s γC‒Η (para-di-substitution) 835 s -
δCH2 1427 s 1423 m γC‒Η 802 m -
δCH3 1396 m - βC‒C‒C 785 m 782 w
νC‒OH 1335 s - γC‒Η 743 vw
692 m
673 vw		 749 vw
672 vw
νC‒COOH 1308 vs - βC‒C‒C 582 s 580 m
β=C‒Η 1285 s 1287 m γO‒Η 547 s -
νC‒O(CH2) 1248 vs 1246 m βC‒C‒C 515 m -

a ν‒stretching; β‒in-plane bending; δ‒deformation; ρ‒rocking; γ‒out-of-plane bending; ω‒wagging. b vw: very weak; w: Weak; m: Medium; A: strong; vs: very strong; br: Broad.