A series of fluorescence-containing indazole-fused ring systems were made with the support of g-C₃N₄/CuO as a catalyst via non-conventional (microwave) method. We have synthesized g-C₃N₄/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

通过非常规（微波）方法，以g -C ₃ N ₄ / CuO为催化剂，制备了一系列含荧光的吲唑稠合环体系。我们已经通过机械化学方法合成了g -C ₃ N ₄ / CuO纳米复合材料。此外，还使用各种仪器技术，例如傅立叶变换红外光谱（FT-IR），X射线粉末衍射（XRD），能量色散X射线光谱（EDS）和透射电子显微镜（TEM），研究了其形态和组成。另外，我们合成了嘧啶基[1，2- b在使用微波辐射的一步法中，无需任何溶剂即可得到吲唑-4-基甲醇基序。使用响应表面方法（RSM）优化了嘧啶并[1，2- b ]吲唑-4-基甲醇基序。可以轻松进行此准备工作，并授权对基材进行概述。嘧啶并咪唑核心结构表现出最显着的光物理性能。当使用乙酸乙酯作为溶剂时，大多数嘧啶并咪唑支架出现溶剂化变色，并伴随蓝绿色荧光移动而激发。该结果表明合成的嘧啶并咪唑核心基序作为荧光团具有巨大的潜力，这将有助于我们研究几种应用。

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