Table 5 The calculated and experimental wavenumbers of the studied compound 3

υ _{(CH, aromatic)}

3096–3046

3090–3030

υ _(=C20H21)

3092

3090

υ _(=C22H23)

3053

υ _{(CHasym, CH3)}

3011–2971

3016–2919

υ _{(CHsym, CH3)}

2928–2922

2852

υ _(C=O)

1649

1626

υ_C20=C22

1614

1604

υ_{C=C (aromatic)}

1611–1489

1546–1500

δ_{CH in-plane methyl}

1466–1441

1469–1433

δ_{CH out-of-plane methyl}

1419–1396

1391

δ_{methyl umbrella}

1373–1367

1365

δ_{CH aromatic in plane}

1362–1333, 1265–1116, 1008

1353, 1345, 1237–1130

δ _{(=C-H in plane)}

1318, 1278

1299, 1290

δ_{CH aromatic out-of-plane}

967, 960, 937, 904–816, 765, 748–691

975, 960, 885–827, 760, 745–680

δ _{(=C-H out-of-plane)}

995, 883

996, 885

δ_{methyl rocking}

1049–1014

1070–1015