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 2

Unsymmetrical tetradentate Schiff base ligands and their Fe(III) complexes.

Ligand	R	Fe(III) complex
H2L1	H	[Fe(III)L1Cl]
H2L2	F	[Fe(III)L2Cl]
H2L3	Cl	[Fe(III)L3Cl]
H2L4	Br	[Fe(III)L4Cl]
H2L5	t-Bu	[Fe(III)L5Cl]
H2L6	OCH3	[Fe(III)L6Cl]