Insights into the use of [Ru(p-Cym)(bipy)Cl]Cl as precatalyst for solvolytic dehydrogenation of ammonia-borane
摘要:
A detailed study on the use of [Ru(p-Cym)(bipy)Cl]Cl as precatalyst for the solvolytic dehydrogenation of ammonia-borane (AB) is presented. A new [Ru(p-Cym)(bipy)(NH3)](PF6) was synthesized and its dication identified as the dormant state of the catalyst after release of the hydrogen pressure from the reaction mixture. Exhaustive analysis of the activation procedure permitted us to establish an optimized experimental protocol to form the actual catalyst from either [Ru(p-Cym)(bipy) Cl]Cl or related precursors. Following this procedure, 2.62 equivalents of hydrogen per mol of ammonia-borane were released in 2.7 min at 49 degrees C. Kinetic experiments and a comparison on the use of different precatalysts are also presented. (C) 2014 Elsevier B.V. All rights reserved.