Synthesis, Characterization, Antioxidant, and Antibacterial Studies of Some Metal(II) Complexes of Tetradentate Schiff Base Ligand: (4E)-4-[(2-(E)-[1-(2,4-Dihydroxyphenyl)ethylidene]aminoethyl)imino]pentan-2-one

Table 2

FTIR spectral data of the Schiff base ligand H₂LL and its metal complexes.

Compound	ν(OH)·ν(H2O)	ν(CH3/CH2)	ν(C=N)	ν(C=C)	ν(C-O)	ν(M-N)	ν(M-O)
H2LL	3475 sb	2928 w, 2911 w	1612 vs	1534 s, 1480 m	1243 s, 1271 s	—	—
Cu(LL)·2H2O	3399 mb	2975 s, 2902 m	1588 vs	1535 s, 1439 s	1241 s, 1180 m	522 m	466 m
Ni(LL)·2H2O	3346 mb	2975 s, 2900 m	1584 vs	1534 s, 1442 s	1242 s, 1180 m	502 m	465 w
Co(LL)·3H2O	3422 mb	2976 s, 2902 s	1598 vs	1542 m, 1461 m	1250 s, 1190 m	504 m	427 m
Zn(LL)·H2O	3417 sb	2974 m, 2901 m	1588 vs	1534 s, 1481 m	1266 s, 1242 s	536 m	436 s

s: strong; b: broad; v: very; m: medium; w: weak.