Simple solvothermal synthesis of a novel Er3+ and Nd3+ doped Sr2As2O7 nanomaterials and investigation of catalytic performance for synthesis of organic compounds

Doping some lanthanide ions into Sr2As2O7 crystal system is reported for thefirst time by a simple solvothermal method using Sr(NO3)2, As2O3, Er2O3 andNd2O3 compounds. Characterization of the as-synthesized nanomaterials isdone by powder X-ray (PXRD) analysis. Rietveld's analysis data confirmed thatthe synthesized materials were crystallized in a mixture of three crystal phases.FESEM images revealed that dopant ion type had a considerable effect on themorphology of the final product. The data showed that the morphology of thesynthesized materials was comb-like structure and particle. Direct bandgapenergy (Eg) of the materials obtained using ultraviolet-visible spectra showed thatthe Eg was about 3.5 eV. The synthesized nanomaterials were used as catalysts inthe Biginelli reactions. The data confirmed that the materials could behave asLewis acid catalyst in the reactions. The catalytic performance of the synthesizedsample was 92% when the catalyst amount was 0.03 g, the reaction temperature was90 °C and the reaction time was 100 min.