Search

Ruthenium nanoparticles (NPs) supported over carbon thin films (Ru/C thin films) catalysts were synthesized by pulsed laser deposition and used as catalysts for hydrolysis of ammonia borane (AB). Highly irregular and porous carbon films with high surface area were deposited by varying Ar gas pressures during the deposition. By taking the advantage of phase explosion phenomena, occurring at high laser fluence, the surface of the carbon films were decorated with crystalline Ru NPs with size below ∼10 nm. Ru/C thin film catalyst produced H 2 with 6 times higher H 2 generation rate as compared to unsupported Ru NPs assembled film, and with a high turnover frequency value of 70.5 mol H 2 mol −1 Ru min −1 . A combination of morphological features and high content of sp 2 bonded C atoms provides good dispersion of Ru NPs over a large surface area. Both these features contribute in generating large number of active sites leading to the increase in catalytic efficiency. A possibility of using the present form of catalyst as an ON/OFF switch for H 2 production was also tested. Although the catalytic activity decreased with the number of hydrolysis cycles, Ru/C thin film catalyst was able to generate the expected amount of H 2 gas in each cycle when it was reused several times. The observed low activation energy (∼28 kJ mol −1 ) and high H 2 generation rate (15.5 L H 2 min −1 g −1 of Ru) by hydrolysis of AB suggest that Ru/C thin film catalyst is highly efficient. [ABSTRACT FROM AUTHOR]

A series of novel terpyridine derivatives of benzofuran (NP1–NP3) were synthesised by simple multicomponent one pot reaction among benzofuran-2-carbaldehyde, ammonium hydroxide and three different derivatives of acetyl pyridine with isolated yield up to 98%. All the synthesised molecules were characterised by NMR, HRMS, IR spectroscopies and single crystal XRD (CIF file CCDC no. 2078532 for TP1). Cu(II) complexes were prepared selectively with terpyridine derivative of 2-acetyl pyridine and characterised by single crystal XRD (CIF file CCDC no. 1525025 for TP-Cu). UV−Vis spectral studies were performed with all the prepared molecules. [ABSTRACT FROM AUTHOR]