Asian Journal of Research in Chemistry

Green synthesis is adopted these days preferentially over traditional one as the later one demands toxic, hazardous reagents which have been posing threat to both human being and ecology. The work discussed here involve synthesis of Binuclear octa coordinated lanthanide(III) complexes of 2, 3-dihydroxy-1, 4-napthoquinone derivative possessing [M₂L₃(H₂O)4] composition by both conventional and ultrasound assisted methods. Microwave synthesis is another green option to reckon with for the synthesis of the same complex. However, ultrasound assisted synthesis is used for the first time for the same cause and is found to give not only much higher yield but also more atom efficient or atom economical and is better placed in respect of less time consumption unlike conventional route. It implies that the pathways followed in nonconventional methods like using ultrasound or microwaves must have been following alternative sustainable pathways with less time consumption, better recovery efficiency, and using eco-benign reagents. If water is used as reaction medium it is found to exhibit much higher atom efficiency than conventional organic solvents like ethanol. A comparison is made between the ultrasound assisted synthesis and conventional chemistry based methods and the former is found to generate the far better against the later one. The resultant complexes have been characterized by UV-Vis, FT-IR, ¹H NMR spectroscopy.