Synthesis of [2,2-Bipyridine]-1,1′-diium Tricyanomethanide as a Bifunctional Nanostructured Ionic Liquid: Application to the Synthesis of 2-Aryl-5-methyl-2,3-dihydro-1H-3-pyrazolone Derivatives

{[2,2-BPyH][C(CN)(3)](2)} was synthesized and fully characterized by IR, H-1 NMR, C-13 NMR, mass, X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric (TG), and differential thermal (DTA) analysis. [2,2-Bipyridine]-1,1-diium tricyanomethanide {[2,2-BPyH][C(CN)(3)](2)} as a bifunctional nanostructure ionic liquid beneficial catalyzed the synthesis of 2-aryl-5-methyl-2,3-dihydro-1H-3-pyrazolone derivatives via the one-pot, four-component condensation reaction of aromatic aldehydes, ethyl acetoacetate, phenyl hydrazine, and -naphthol under solvent-free conditions at room temperature. The major advantages of the offered process are efficient catalysis and recyclability of catalyst.