Synthesis, Characterization, and In Vitro Cytotoxicity of Unsymmetrical Tetradentate Schiff Base Cu(II) and Fe(III) Complexes

Table 3

Selected typical signals of IR (cm⁻¹) spectra of the obtained ligands and synthetic complexes.

Compound	(O−H)	(C=N)	(C−N)	(C−O)	δ(O−H)	(M−N)	(M−O)
H2L1	2748	1611	1277	1187	758	—	—
[Cu(II)L1]	—	1607	1257	1148	745	530	503
[Fe(III)L1Cl]	—	1602	1258	1149	747	536	475
H2L2	2718	1615	1264	1202	757	—	—
[Cu(II)L2]	—	1619	1258	1149	743	531	504
[Fe(III)L2Cl]	—	1611	1254	1143	742	532	482
H2L3	2697	1614	1277	1181	757	—	—
[Cu(II)L3]	—	1616	1259	1179	746	538	504
[Fe(III)L3Cl]	—	1610	1260	1145	760	535	479
H2L4	2678	1612	1276	1181	756	—	—
[Cu(II)L4]	—	1617	1257	1172	755	522	504
[Fe(III)L4Cl]	—	1604	1258	1145	759	534	476
H2L5	2737	1611	1271	1212	740	—	—
[Cu(II)L5]	—	1604	1222	1160	742	528	411
[Fe(III)L5Cl]	—	1599	1251	1185	734	535	415