Synthesis and Catalytic Activity of Functional Ionic Ruthenium Compounds
|School||East China Normal University|
|Keywords||Functionalized Ionic Liquid Ruthenium Complexes Oxidation reaction Hydrogenation reaction Hydrogen transfer reactions|
This paper design The synthetic ligand functionalized ionic liquid (including phosphine ligands functionalized ionic liquid nitrogen ligand functionalized ionic liquids , and nitrogen - phosphine bidentate ligands functionalized ionic liquids , Figure 1 ) , and two kinds of ruthenium complexes functionalized ionic liquid ( Figure 2 ) . And investigated transition metal ruthenium compounds auxiliary ligand functionalized ionic liquids under the catalytic oxidation reaction and reduction reaction performance : a ) in ordinary ionic liquid medium , RuCl3.3H2O and ligand functionalized ionic liquids directly in two ways mixed for catalytic molecular oxygen in the alcohol oxidation reaction of the oxidant ; ) RuCl3 · 3H2O with phosphine ligands functionalized ionic liquid the coordination occurs first synthesized ruthenium complexes functionalized ionic liquid , then ordinary ionic liquid media investigated aldehydes and ketones of ruthenium complexes functionalized ionic liquid catalytic reduction reaction and molecular oxygen as the oxidant alcohol oxidation reaction performance . Experimental results show that no cooxidant participation conditions, with oxygen as the oxidant, ordinary ionic liquid as a solvent , containing phosphine or nitrogen ligands functionalized ionic liquid and RuCl3 · 3H2O The catalytic system can be effectively catalyzed more alcohols choice oxidation , high selectivity to generate the corresponding aldehyde or ketone . Wherein weaker ligand nitrogen ligands functionalized ionic liquid is more conducive to the activity and selectivity of the ruthenium catalysts ; However, in the ionic liquid system of this feature , the staple catalyst recycling is still not be able to effectively achieve . Situ 31P NMR analysis showed that the oxidative degradation of the ligand functionalized ionic liquid itself is the root causes that lead to the ruthenium catalyst deactivation . The synthesis of new ruthenium complexes functionalized ionic liquid ([RuCl4 (DPPBMIM) 2] PF6) catalyst , aldehydes and ketones hydrogenation and hydrogen transfer reactions exhibit excellent catalytic activity and the catalyst can be recycled many times catalytic activity remained unchanged ; template reaction , molecular oxygen oxidation of benzyl alcohol as the effects of the catalyst of ( [ RuCl4 ( DPPBMIM ) 2 ] H2PW12O40 of the oxidation activity - experiments show that phosphorus tungstate ( [ H2PW12040 - ) counter anion , can significantly enhance the ruthenium complex cation ([RuCl4 (DPPBMIM) 2]) the thermal stability and antioxidant capacity , which reflects better than [ RuCl4 ( DPPBMIM ) 2 ] PF6 catalytic activity and stability .