Schiff bases and their la(III) complexes: Conventional and microwave-assisted synthesis, physicochemical and spectroscopic analysis

• Published in: Malaysian Journal of Chemistry
• Main Author: Nasaruddin N.H.; Ahmad S.N.; Bahron H.; Rahman N.M.M.A.; Yusof N.S.M.
• Format: Article
• Language: English
• Published: Malaysian Institute of Chemistry 2021
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85110064283&partnerID=40&md5=daa094b0bf70d18362e8e9f14448c2c2

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.