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New aqua N-heterocyclic carbene Ru(II) complexes with two-electron process as selective epoxidation catalysts: An evaluation of geometrical and electronic effects

New ruthenium complexes with general formula [RuII(T)(CN-Me)X] n+ (X = Cl- or H2O; T = 2,2′:6′, 2″-terpyridine, trpy, or N,N-bis(2-pyridyl)ethylamine, bpea; CN-Me = N-methyl-N′-2-pyridylimidazolium) have been prepared. The complexes obtained have been characterized in solution by spectroscopic (1D- and 2D-NMR and UV-vis) techniques, mass spectrometry, and elemental analysis. The chloro complexes have also been characterized by X-ray diffraction analysis. The redox properties of all the compounds were studied by CV revealing, for the reported Ru-OH2 complexes, bielectronic Ru(IV/II) redox processes throughout a wide pH range. The catalytic activity of aquo complexes was evaluated in the epoxidation of olefins using PhIO as oxidant, displaying in general good yields and high selectivities for the epoxide product. The influence of electronic and geometrical factors on the spectroscopic and electrochemical properties as well as on the catalytic activity is discussed. © 2013 American Chemical Society

This research has been financed by MINECO of Spain through Projects CTQ2010-21532-C02-01, CTQ2012-32436, and CTQ2009-08328

© Inorganic Chemistry, 2013, vol. 52, núm. 9, p. 5077-5087

American Chemical Society (ACS)

Author: Dakkach, Mohamed
Atlamsani, Ahmed
Parella Coll, Teodor
Fontrodona, Xavier
Romero García, Isabel
Rodríguez Pizarro, Montserrat
Date: 2013
Abstract: New ruthenium complexes with general formula [RuII(T)(CN-Me)X] n+ (X = Cl- or H2O; T = 2,2′:6′, 2″-terpyridine, trpy, or N,N-bis(2-pyridyl)ethylamine, bpea; CN-Me = N-methyl-N′-2-pyridylimidazolium) have been prepared. The complexes obtained have been characterized in solution by spectroscopic (1D- and 2D-NMR and UV-vis) techniques, mass spectrometry, and elemental analysis. The chloro complexes have also been characterized by X-ray diffraction analysis. The redox properties of all the compounds were studied by CV revealing, for the reported Ru-OH2 complexes, bielectronic Ru(IV/II) redox processes throughout a wide pH range. The catalytic activity of aquo complexes was evaluated in the epoxidation of olefins using PhIO as oxidant, displaying in general good yields and high selectivities for the epoxide product. The influence of electronic and geometrical factors on the spectroscopic and electrochemical properties as well as on the catalytic activity is discussed. © 2013 American Chemical Society
This research has been financed by MINECO of Spain through Projects CTQ2010-21532-C02-01, CTQ2012-32436, and CTQ2009-08328
Format: application/pdf
ISSN: 0020-1669 (versió paper)
1520-510X (versió electrònica)
Document access: http://hdl.handle.net/10256/11714
Language: eng
Publisher: American Chemical Society (ACS)
Collection: MICINN/PN 2011-2014/CTQ2010-21532-C02-01
Reproducció digital del document publicat a: http://dx.doi.org/10.1021/ic302863h
Articles publicats (D-Q)
Is part of: © Inorganic Chemistry, 2013, vol. 52, núm. 9, p. 5077-5087
Rights: Tots els drets reservats
Subject: Catalitzadors
Catalysts
Compostos heterocíclics
Heterocyclic compounds
Title: New aqua N-heterocyclic carbene Ru(II) complexes with two-electron process as selective epoxidation catalysts: An evaluation of geometrical and electronic effects
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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