Synthesis, Characterization, and Biological Activity of N′-[(Z)-(3-Methyl-5-oxo-1-phenyl-1,5-dihydro-4H-pyrazol-4-ylidene)(phenyl)methyl]benzohydrazide and Its Co(II), Ni(II), and Cu(II) Complexes

Table 4

Relevant IR absorption bands for the ligand and metal complexes.

Compound	O–H	N–H	C=O^a	C=O^b	C=N	N–N	C–O	M–O	M–N
L^1	—	3132	1645	1596	—	1117	—	—	—
Cu(L^1)2·H2O	3448	3311	1597	—	1567	1026	1440	519	418
Ni(L^1)2·H2O	3376	3059	1621	—	1570	1027	1437	509	460
Co(L^1)2·H2O	3468	3275	1623	—	1566	1025	1438	510	472

Hydrazide moiety, ^bpyrazolone ring.