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Table 2 Experimental FT-IR, FT-Raman frequencies and assignment for 2A3MP and 2A4MP

From: Tautomerization, molecular structure, transition state structure, and vibrational spectra of 2-aminopyridines: a combined computational and experimental study

FT-IR frequency (cm−1)

FT-Raman frequency (cm−1)

Assignment

2A3MP

2A4MP

2A3MP

2A4MP

3470

3431

3468

3430

NH2 asym. stretch

3335

3300

3338

3305

NH2 sym. stretch

3068

3096

3067

3095

CH asym. stretch

–

–

3033

3060

CH stretch

3024

3055

3019

3041

CH stretch

2974

2980

2980

2980

CH3 asym. stretch

2935

2919

2925

2955

CH3 asym. stretch

2858

–

2864

2900

CH3 sym. stretch

1623

1646

1618

1646

NH2 scissoring

1449

1453

–

–

CH3 asym. scissoring

1384

1374

1379

1370

CH3 sym. scissoring

1282

1268

1264

1270

C=N stretch

1250

1248

1195

1246

CH in- plane bending

1196

1177

1188

1177

C–CH3 stretch

1135

1130

1137

1130

CH in- plane-bending

1080

1040

1068

1038

CH in- plane-bending

1035

1035

1031

1033

CH3 rocking

–

–

855

830

CH out-of-plane

774

788

762

786

CH out-of-plane

–

–

750

750

CH out-of-plane

524

455

525

455

NH2 wagging

–

 

288

 

C–CH3 in-plane-bending

–

 

251

 

C–CH3 out-of-plane