2026-04-17T01:55:04Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/117132024-06-18T13:50:31Zcom_2072_452955com_2072_2054col_2072_453073

00925njm 22002777a 4500 dc Dakkach, Mohamed author Fontrodona, Xavier author Parella Coll, Teodor author Atlamsani, Ahmed author Romero García, Isabel author Rodríguez Pizarro, Montserrat author info:eu-repo/date/embargoEnd/2026-01-01 info:eu-repo/date/embargoEnd/2026-01-01 2014 New Ru complexes containing the bpea-pyr ligand (bpea-pyr stands for N,N-bis(pyridin-2-ylmethyl)-3-(1H-pyrrol-1-yl)propan-1-amine), with the formula [RuCl2(bpea-pyr)(dmso)] (isomeric complexes 2a and 2b) or [Ru(CN-Me)(bpea-pyr)X)]n+ (CN-Me = 3-methyl-1-(pyridin-2-yl)-1H- imidazol-3-ium-2-ide; X = Cl, 3, or X = H2O, 4), have been prepared and fully characterized. Complexes 3 and 4 have been anchored onto an electrode surface through electropolymerization of the attached pyrrole group, yielding stable polypyrrole films. The electrochemical behaviour of 4, which displays a bielectronic Ru(IV/II) redox pair in solution, is dramatically affected by the electropolymerization process leading to the occurrence of two monoelectronic Ru(IV/III) and Ru(III/II) redox pairs in the heterogeneous system. A carbon felt modified electrode containing complex 4 (C-felt/poly-4) has been evaluated as a heterogeneous catalyst in the epoxidation of various olefin substrates using PhI(OAc)2 as an oxidant, displaying TON values of several thousands in all cases and good selectivity for the epoxide product This research was financed by MINECO of Spain through projects CTQ2010-21532-C02-01, CTQ2012-32436 and CTQ2009-08328. The authors acknowledge STR from UdG for technical support http://hdl.handle.net/10256/11713 Catalitzadors Catalysts Catàlisi heterogènia Heterogeneous catalysis Polypyrrole-functionalized ruthenium carbene catalysts as efficient heterogeneous systems for olefin epoxidation