| Summary: | Two lanthanum(III) Schiff base complexes, 2,2'-((1E,1'E)-((2,2-dimethylpropane-1,3-diyl)bis (azanylylidene))bis(methanylylidene))diphenollanthanum(III) [La(AD1H)] and 6,6'-((1E, 1'E)- ((2,2-dimethylpropane-1,3-diyl)bis(azanylylidene))bis(methanylylidene))bis(2- methoxyphenol) lanthanum(III) [La(AD1OMe)] were successfully synthesized. The complexes were prepared by conventional reflux and microwave-assisted synthesis methods where a minimum amount of solvent was used, with a shorter reaction time for the latter. Both ligands and their lanthanum(III) complexes were characterized by spectroscopic and physicochemical analyses. The shift of v(C=N) to a higher frequency by 15-18 cm-1 indicated that the complexation to La(III) through the azomethine N was established. It was further supported through the shifting of the azomethine proton signal to higher chemical shifts with Δδ=0.19-0.23 ppm. In addition, the shifting of the n-π∗(C=N) band in UV-Vis spectra with Δλ= 2-16 nm also indicated the involvement of azomethine nitrogen in the complexation. © 2021 Malaysian Institute of Chemistry. All rights reserved.
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