: We straightforwardly synthesized 18 different types of palladium nanoparticles by using a series of palladium metal precursors and ionic liquids. All the materials went for XRD, TEM, and ICP-OES analysis, before going to Heck cross-coupling reaction as a catalyst. We evaluated the catalytic performance of our developed IL#Pd MNP catalyst over Heck cross-coupling reaction between different terminal olefins with various 3-iodo-benzopyrones, including sterically hindered, electron-rich, electron neutral and electron-deficient systems. We obtained the Heck cross-coupling reaction product in good to average yield under phosphine free reaction condition with an added advantage of 6 times catalyst recycling.

Nanocrystalline samples of CaWO 4 were prepared at room temperature by simple chemical precipitation. The samples were characterized by X-ray diffraction and scanning electron microscopy. Energy dispersive X-ray analysis confirmed the elements present in the sample. The frequency and temperature dependence of the dielectric constant and ac electrical conductivity of the nanomaterial were investigated. Very low dielectric loss in nanocrystalline CaWO 4 powder was observed at high frequencies. The values of ac electrical conductivity calculated from the permittivity studies were found to increase as frequency increased, conforming to small polaron hopping.