Synthesis, structure, redox properties, and catalytic activity of new ruthenium complexes containing neutral or anionic and facial or meridional ligands: An evaluation of electronic and geometrical effects

Isabel Serrano, Xavier Sala, Elena Plantalech, Montserrat Rodríguez, Isabel Romero, Susanna Jansat, Montserrat Gómez, Teodor Parella, Helen Stoeckli-Evans, Xavier Solan, Mercè Font-Bardia, Balamurugan Vidjayacoumar, Antoni Llobet

Research output: Contribution to journalArticleResearchpeer-review

17 Citations (Scopus)

Abstract

The synthesis of a family of new Ru complexes containing meridional or facial tridentate ligands with the general formula [RuII(T)(D)(X)] n+ [T = 2,2′:6′,2″-terpyridine or tripyrazolylmethane; D = 4,4′-dibenzyl-4,4′,5,5′-tetrahydro-2, 2′-bioxazole (S,S-box-C) or 2-[((1′S)-1′-(hydroxymethyl)- 2′-phenyl)ethylcarboxamide]-(4S)-4-benzyl-4,5-dihydrooxazole (S,S-box-O); X = Cl, H2O, MeCN or pyridine] has been described. All complexes have been spectroscopically characterized in solution through 1H NMR and UV-vis techniques. Furthermore, all of the chloro complexes presented here have also been characterized in the solid state through monocrystal X-ray diffraction analysis. The oxazolinic S,S-box-C ligands undergo a Ru-assisted hydrolysis reaction generating the corresponding amidate anionic oxazolinic ligands S,S-box-O, which are also strongly attached to the metal center and produce a strong σ-donation effect over the Ru metal center. The redox properties of all complexes have also been studied by means of cyclic voltammetry, strongly reflecting the nature of the ligands; both effects, geometrical (facial vs meridional) and electronic (neutral vs anionic), can be unveiled and rationalized. Finally, the reactivity of the Ru-OH2 complexes has been tested with regard to the epoxidation of trans-stilbene, and it has been shown that, in this particular case, the reactivity is practically not dependent on the redox potentials of the catalyst but, in sharp contrast, it is strongly dependent on the geometry of the tridentate ligands. © 2007 American Chemical Society.
Original languageEnglish
Pages (from-to)5381-5389
JournalInorganic Chemistry
Volume46
Issue number13
DOIs
Publication statusPublished - 25 Jun 2007

Fingerprint

Dive into the research topics of 'Synthesis, structure, redox properties, and catalytic activity of new ruthenium complexes containing neutral or anionic and facial or meridional ligands: An evaluation of electronic and geometrical effects'. Together they form a unique fingerprint.

Cite this