Nanoporous titania-supported gold nanoparticles have been synthesized through the deposition–precipitation method, and the synthesized nanoparticles have been characterized by XRD, SEM, HRTEM, EDAX, BET adsorption isotherm, and IR and UV–vis spectral techniques. The efficiency of this catalyst toward green organic synthesis has been studied by carrying out the 1,3-dipolar cycloaddition of organic azides with a variety of terminal alkynes in water. The reaction proceeds regioselectively yielding the corresponding 1,4-disubstituted-1,2,3-triazole derivative in good to excellent yield.

A simple microwave assisted protocol for the construction of maleimides from various anilines and dialkyl acetylene dicarboxylates has been demonstrated. The AIE property of one of the maleimide derivatives has been studied in detail. The maleimide is AIE-active, and its color, fluorescence efficiency, quantum yield and fluorescence lifetime can be readily tuned by adding water to the THF solution. Compound 3a is found to be weakly luminescent when it is dissolved in THF, but its luminescence intensity increases enormously by the gradual addition of water up to 90% with associated increase in quantum yield and fluorescence lifetime.

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