ИСТИНА

A new, three-dimensional crystalline organic frameworks (F-2 and CF-2) were obtained, linked by hydrogen bonds and additionally stabilized by the opposite charges of the components (Fig. 1). The materials were proved to be an efficient media for stabilizing metal nanoparticles. For example, Pd@F2 (А-2) was simply made by mixing an aqueous solution of tetrasodium salt of tetraphenylmethane-tetrasulphonate (TPSM) and PdCl4 salt of protonated tetrakis(4-aminophenyl)methane under H2 in water to give the black powder of A-2. Pd@CF2 (A-3) was obtained by mixing the dipalladium salt of tetraphenylmethane tetrasulfonic acid and a chiral tetraamine hydrochloride in water in a stream of hydrogen. The materials contained 17-20% of Pd and were not pyrophoric. A-2 and A-3 could be used as efficient heterogeneous catalysts of acetylene derivatives reductions with its activity similar to that of Pd/C. A-2 reduced the aldehyde and epoxide groups very slowly and allowed the reduction of the acetylene groups to be hydrogenated selectively in the presence of the aldehyde groups. The behavior contrasts with that of Pd/C which reduces both aldehyde and acetylene groups simultaneously. A rational for the behaviour was put forward. A-3 is being used for asymmetric reduction of double C-C bonds.