Synthesis, Spectral Characterization, and In Vitro Cytotoxicity of Some Fe(III) Complexes Bearing Unsymmetrical Salen-Type Ligands Derived from 2-Hydroxynaphthaldehyde and Substituted Salicylaldehydes

Table 3

Selected typical signals of IR spectra of the obtained ligands and synthetic complexes.

Compound	ν(O-H; N-H)	ν(C=N)	ν(C=O)	ν(C-N)	ν(C-O)	ν(M−N)	ν(M−O)
H2L1	2715	1611	1541	1278	1211	—	—
[Fe(III)L1Cl]	—	1597	1532	1252	1189	548	456
H2L2	2740	1618	1542	1274	1200	—	—
[Fe(III)L2Cl]	—	1599	1532	1246	1185	531	455
H2L3	2780	1618	1543	1278	1211	—	—
[Fe(III)L3Cl]	—	1597	1531	1260	1188	552	456
H2L4	2775	1611	1542	1276	1211	—	—
[Fe(III)L4Cl]	—	1598	1533	1258	1187	534	455
H2L5	2858	1615	1542	1288	1210	—	—
[Fe(III)L5Cl]	—	1600	1532	1256	1186	539	456
H2L6	2836	1615	1540	1273	1207	—	—
[Fe(III)L6Cl]	—	1596	1530	1254	1190	545	456