S. No.

Schiff bases

FT-IR (cm⁻¹)

Experimental

DFT (B3LYP/6-311G (d,p))

ν_>C=N-

ν_ph-OH

ν_ph-C-O

ν_ph-N=C-

ν-_N=CH-/

ν-_N=C(CH3)-

ν_>C=N-

ν_ph-OH

ν_{ph-C-O /} ν_Ph-OCH3-

ν_ph-N=C<

ν-_N=CH-/

ν-_N=C(CH3)-

1.

SA

1671

3363

1367

1274

3020

1663

3832

1305

1199

3178

2.

AA

1656

3399

1362

1276

3054

1685

3833

1321

1253

3178

3.

VA

1692

3375

1371

1281

3029

1708

3831

1325

1209

2987

4.

NA

1642

3308

1373

1296

3069

1652

3838

1389

1279

3183