A Rhodium (I) complex with hexylamine and chloride ligands, catalytically active in the selective hydrogenation of 1-heptyne

LIPRANDI, D; CAGNOLA, E; QUIROGA, M.; L´ARGENTIERE, P

Industrial & Engineering Chemical Research

American Chemical Society

Año: 2006 vol. 45 p. 5836 - 5840

0888-5885

A rhodium (I) complex containing chloro and hexylamine was obtained, which shows catalytic activity for the 1-heptyne semihydrogenation, at mild conditions (303 K and 150 kPa), in homogeneous as well as heterogeneous systems using g-alumina as support. FTIR spectra indicate that the hexylamine molecule is one of the ligands present in the complex species. On the other hand, the analysis of the results of XPS and elemental composition suggest that the complex is tetra-coordinated with an empirical formula [RhCl(NH2(CH2)5CH3)3], and that this one attaches to the support and it is not destroyed under reaction conditions. The absence of complex leaching from the supported catalyst was verified by XPS, Atomic Absorption analysis for Rh in solution, and catalyst re-using tests. When supported, the complex shows higher activity and selectivity than it does when unsupported, and also than the classic Lindlar catalyst used as a reference; this fact may be attributed, at least in part, to electronic and geometrical effects.