OICC Press Journal of Nanostructure in Chemistry 2193-8865 10 4 (December 2020) 2020 09 16 Fabricating a g-C3N4/CuO heterostructure with improved catalytic activity on the multicomponent synthesis of pyrimidoindazoles 10.1007/s40097-020-00350-0 EN Duraipandi Devi Priya Chemistry of Heterocycles and Natural Product Research Laboratory, Department of Chemistry, School of Advanced Science, Vellore Institute of Technology, Vellore, Tamilnadu, 632014, IN Md. Maksudur Rahman Khan Department of Chemical Engineering, College of Engineering, Universiti Malaysia Pahang, Gambang, Pahang, 26300, MY Selvaraj Mohana Roopan Chemistry of Heterocycles and Natural Product Research Laboratory, Department of Chemistry, School of Advanced Science, Vellore Institute of Technology, Vellore, Tamilnadu, 632014, IN Journal Article 2020 09 16 Abstract A series of fluorescence-containing indazole-fused ring systems were made with the support of g -C 3 N 4 /CuO as a catalyst via non-conventional (microwave) method. We have synthesized g -C 3 N 4 /CuO nanocomposites by mechanochemical process; further, its morphology and composition were studied using various instrumental techniques like Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and transmission electron microscopy (TEM). Also, we have synthesized pyrimido[1, 2- b ] indazole-4-yl methanol motifs without any solvent in single-step methodology utilizing microwave irradiation. The pyrimido[1, 2- b ] indazole-4-yl methanol motifs were optimized using response surface methodology (RSM). This preparation was effortlessly accessible, and the overview of the substrates was authorized. The pyrimidoindazole core structures exhibit the most remarkable photo physical properties. Most of the pyrimidoindazole scaffold appears in solvatochromism and excited with blue–green fluorescence shift while using ethyl acetate as solvent. This result indicates that synthesized pyrimidoindazole core motifs have prodigious potential as fluorophores which will help us to study several applications. Graphic abstract