The reaction of the Pt(I)Pt(I)Pt(II) triangulo cluster Pt-3(mu -PBu2t)(3)(H)(CO)(2) (1) with TfOH (Tf = CF3SO2) affords the hydride-bridged cationic derivative [Pt-3(mu -PBu2t)(2)(mu -H)((PBu2H)-H-t)(CO)(2)]OTf (2). With TfOD the reaction gives selectively [Pt-3(mu -PBu2t)(2)(mu -D)((PBu2H)-H-t)(CO)(2)] OTf (2-D-1), implying that the proton is transferred to a metal center while a P-H bond is formed by the reductive coupling of one of the bridging phosphides and the terminal hydride ligand of the reagent. The reaction proceeds through the formation of a thermally unstable kinetic intermediate which was characterized at low temperatures, and was suggested to be the GO-hydrogen-bonded (or protonated) [Pt-3(mu -PBu2t)(3)(H)(CO)(2)]. HOTf (3). An ab initio theoretical study predicts a hydrogen-bonded complex or a proton-transfer tight ion pair as a possible candidate for the structure of the kinetic intermediate.

Mechanism of Protonation of [Pt3(mu-PBu2)3(H)(CO)2],yielding the Hydride-Bridged [Pt3(mu-PBu2)2(mu-H)(PBu2H)(CO)2]OTf(Tf=CF3SO3),and the Spectroscopic and Theoretical Characterization of a Kinetic Intermediate

LEONI, PIERO;MARCHETTI, FABIO;PASQUALI, MARCO;
2001

Abstract

The reaction of the Pt(I)Pt(I)Pt(II) triangulo cluster Pt-3(mu -PBu2t)(3)(H)(CO)(2) (1) with TfOH (Tf = CF3SO2) affords the hydride-bridged cationic derivative [Pt-3(mu -PBu2t)(2)(mu -H)((PBu2H)-H-t)(CO)(2)]OTf (2). With TfOD the reaction gives selectively [Pt-3(mu -PBu2t)(2)(mu -D)((PBu2H)-H-t)(CO)(2)] OTf (2-D-1), implying that the proton is transferred to a metal center while a P-H bond is formed by the reductive coupling of one of the bridging phosphides and the terminal hydride ligand of the reagent. The reaction proceeds through the formation of a thermally unstable kinetic intermediate which was characterized at low temperatures, and was suggested to be the GO-hydrogen-bonded (or protonated) [Pt-3(mu -PBu2t)(3)(H)(CO)(2)]. HOTf (3). An ab initio theoretical study predicts a hydrogen-bonded complex or a proton-transfer tight ion pair as a possible candidate for the structure of the kinetic intermediate.
A., Fortunelli; Leoni, Piero; Marchetti, Fabio; Pasquali, Marco; F., Sbrana; M., Selmi
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/177070
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