Table 1 IR absorption bands and their assignments

3454^S/B

NH₂ stretching

[47]

3332^S/B

3332^S/B

3205^S/M B

3200^S/B

3202^S/M B

H-bonded NH Stretching

[48,49,50,51]

3026^S

3049^S/B

3026^S

Aromatic C–H stretching/H-bonded (N–H)

[52,53,54]

2921^S

2926^S

2921^S

Aliphatic CH stretching

[55]

2857^M

2859^S

2503^W

2600^S

2618^M/B

1668^S

1659^S/M

C=O

[56]

1604^SH/Sh

1578^M/B

1593^S

1445^S

1418^S

1448^S

C–N stretching/C=C stretching of benzene ring

[52, 53]

1394^S

1288^W

1303^M

CH₂ bending

[57]

1248^M

1199^M

1083^S/B

1090^B

1074^S/B

In plan deformation (CH) (mono substituted ring)

[52, 53, 58]

758^S/SH

742^M

753^S

Out of plan NH bend/out-of-plan deformation CH (mono substituted or 1,2-di substituted ring)

[48, 52,53,54, 57,58,59]

694^S/SH

691^M

694^S

Out of plan NH bend/out-of-plan ring bending (mono substituted ring) and/or aryl C–Cl stretching vibration

[52,53,54, 57, 59, 60]

615^W

612^S/SH

612^M/SH