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Synthesis, spectral and molecular studies of half-sandwich arene ruthenium and Cp*Rh/Cp*Ir complexes containing bidentate P-N and E–N ligands (E = S, Se) based on diphenyl(2-pyridyl)phosphine

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The chalcogenide ligands {E=PPh2Py} (E = O, S, Se) were prepared by direct oxidation of diphenyl(2-pyridyl)phosphine using H2O2, S, and Se powder, respectively. The reaction of ligand with starting metal precursors [(arene)RuCl2]2 {M = Ru, arene = benzene; p-cymene} and [Cp*MCl2]2 (M = Rh, Ir) afforded a series of cationic half-sandwich complexes, [(arene/Cp*)MCl{κ 2-(NE)-EPPh2Py)}]+. Reaction of O=PPh2Py with precursors yielded known complexes [(arene/Cp*)MCl{κ 2-(PN)-PPh2Py)}]+ instead of expected complexes [(arene/Cp*)MCl{κ 2-(NO)-O=PPh2Py)}]+. All new complexes were isolated as counterion and characterized by spectroscopic techniques like FT-IR, NMR, mass, and UV–vis. Some representative complexes were structurally determined by X-ray crystallographic analysis, revealing typical three-legged piano stool geometry around the metal center with a five-membered metallacycle.
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Keywords: Arene ligands; Diphenyl(2-pyridyl)phosphine ligands; Iridium; Rhodium; Ruthenium

Document Type: Research Article

Affiliations: 1: Department of Chemistry, North Eastern Hill University, Shillong, India 2: Department of Chemistry, Pondicherry University, Puducherry, India

Publication date: November 2, 2015

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