New Schiff base [M(NaNp)(Sal)Cl2] metal complexes, where M = Mn(II), Ni(II), Cu(II), or Fe(III), were synthesized. The Schiff base, previously prepared from the reaction of 2-hydroxynaphthaldehyde and naphthalene-1-amine, was mixed with salicylic acid to synthesize the complexes. The characterization of these complexes was performed using powder X-ray diffraction (PXRD), ultraviolet-visible spectroscopy (UV-Vis), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The functional groups involved in the bonding were identified by comparing the FTIR spectra of the Schiff base and its metal complexes. Except for the Fe(III) complex, which was found to be octahedral, the Schiff base complexes were determined to be tetrahedral in geometry based on the FTIR spectra. It was discovered that these compounds coordinate via the carbonyl-O atom, the hydroxyl group's oxygen, and the azomethine group's nitrogen. The UV-Vis spectroscopy data revealed a hypsochromic .....

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