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Silica nanoparticles/ammonium thiocyanate (nano SiO 2 /NH 4 SCN) and H 3 PO 4 embedded on nano silica (H 3 PO 4 @nano SiO 2 ) in the presence of NH 4 SCN were found to be effective systems for the thiocyanation of some arylamines and indoles to afford their corresponding thiocyanated adducts at 70°C under solventfree conditions. The recovery and reusability of nano SiO 2 as a prompting system have been investigated. A simple procedure for the synthesis of H 3 PO 4 @nano SiO 2 has also been represented. In addition, a plausible mechanism of thiocyanation has also been suggested. N H N H SCN Nano SiO 2 / NH 4 SCN Solvent-free, 70ºC 1h, 90%

Using Ag nanoparticles on basalt fibers as a thermal and chemical resistant surface is a novel method for Suzuki coupling reactions. The characterization of this catalyst was done with various analytical tools. It was used as a heterogeneous catalyst and separated from the reaction medium easily. Also, it is economically advantageous, and we use it several times without reducing its catalytic activity.

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