| | Vibrations | Complex | Assignment |
| | 3600–3625 | 1, 2, 3, and 5 | O–H of carboxylic | | 1758–1784 | 1, 2, 3, and 5 | C=O [80] of carboxylic | | 1050–1150 | 1, 2, 3, and 5 | O–C stretches (2-bands) | | 735–745 | 1, 2, 4, and 5 | O–H bend (out-of-plane) | | 3228 | 1, 4 | C–H asymmetric vibration peculiar to pyrazol-1-ly unit | | 3050–3161 | All | C–H arene asymmetric vibration | | 1419 | All | Charge transfer Ru–L [81]
C–C
Arene (C–H) stretches | | 1337 | All but prominent in complex 2 | C–N stretches | | 597 | Complex 3 that is effect of carbonyl unit being very close to metal | Charge transfer | | 614–642 | Complexes 1, 2, 3, and 5 | O–H bend (out-of-plane) of carboxylic unit | | 300 | Complexes 1, 2, 3, and 5 | Peculiar to carboxylic | | 1477 | 4 | Ru–L charge transfer [82];
C–C; C–N | | 1419 | All | Ru–L charge transfer [82]; C–C; C–N | | 700 | 1, 2, 3 | Ru–Cl | | 751 | 2, 4, 5 with pyridine has peculiar | Ru–N(py) | | 847 | 3 | Ru–N(phen) | | 731 | 1, 4 | Ru–N(pz) | | 765 | 4, 5 (strong) | Ru–N(py) should result from the strong long bond of Ru with mid pyridine unit | | 797 | All | Ru–C | | 3161 | 2, 4, 5 | (C–H) antisymmetric stretches (py) | | 3224 | 1, 4 | (C–H) antisymmetric stretches (pz) | | 505 | 5 | Ru–N(py) close to 424–428 assigned to (Ru–S) [80] | | 300 | All | Bond deformations |
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