Ligand/Chelate

υNO₂

υOH(H₂O)

υNH₂

υC=N

υM-O

υM-N

nm (cm⁻¹)

Schiff Base (L¹)

-

3337

-

1588

-

-

375 (26,666)

2-nitroaniline (L²)

1507

-

3349

-

-

-

282 (35,461), 318 (31,447)

[Cr(L¹L²)(OH)₂]・6H₂O

1507

3480

3375

1597

746

523

385 (25,974)

[Co(L¹L²)(OH)(H₂O)]・6H₂O

1482

3410

3300

1600

641

537

413 (24,213), 754 (13,263)

[Ni(L¹L²)(OH)(H₂O)]・6H₂O

1488

3408

3316

1600

748

441

294 (34,014), 396 (25,253)

[Cu(L¹L²)(OH)(H₂O)]・3H₂O

1508

3487

3347

1597

746

521

387 (25,840), 797 (12,547)