Solvent free, Ni-nanoparticle catalyzed greener synthesis and photophysical studies of novel 2H-indazolo[2,1-b] phthalazine-trione derivatives

A nickel nanoparticle (NPs) catalyzed one-pot three component reaction of phthalhydrazide, dimedone and aryl aldehydes under solvent free conditions has been reported. The present approach offers the advantages of simple methodology, clean and mild reaction conditions, short reaction time, low environmental impact, high yield, and excellent purity. The synthesized compounds (2H-indazolo[2,1-b] phthalazine-trione) are found to be suitable candidates for efficient fluorogenic assays to monitor bio-chemical environments.