Mesitylene Osmium(II) Complexes Containing the Functional Phosphane tBuP(CH2CO2Me)2 and Anionic Species Derived Thereof as Bi- and Tridentate Ligands
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Gerhard Henig
Abstract
The dichloroosmium(II) compound [(mes)OsCl2(L)] (2) with L = tBuP(CH2CO2Me)2 reacts with one or two equivalents of AgPF6 to give the mono- or dicationic complexes 3 and 4 containing the phosphanediyldiester as a bi- or tridentate chelating ligand. Complex 4 undergoes, in the presence of water, partial hydrolysis to give the difluorophosphatoosmium(II) derivative 5 in quantitative yield. Treatment of 4 with two equivalents of KOtBu affords by deprotonation at both CH2 groups of L the neutral complex 6, in which one PCHCO2Me unit of the dianionic ligand |tBuP(CHCO2Me)2]2- forms a five-membered and the other PCHCO2Me unit a three-membered ring with the metal. The reaction of 6 with water leads selectively to the formation of the chelate complex 7 containing the phosphanediylbis(carboxylate) [tBuP(CH2CO2)2]2- as a tripodal ligand.
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