4-methoxychalcone 90 85 80 75 70 65 60 55 50 45 40 35 30- 25 20 15 10 4000 3500 3000 2500 2000 1500 1000 500 Wavenumbers (cm-1) %Transmittance 3014.90 2841.30 1655.22 1587.37 1576.52 1460.04 1444 40 1333.72 1417.29 1316.13 1301.70 1209.60 1180.24 1166.83 1111.25 1028.90 1014.62 983.47 823 63 814.49 777.95 720.96 687.48 658.07 635.24 617.97 513.34 469.59 432.12

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