Hydridotriplatinum chemistry and a stepwise electrophilic ligand substitution mechanism
Abstract
The cluster complex [Pt3(µ3-H)(µ-dppm)3]+(1)(dppm = Ph2PCH2PPh2) can be protonated rapidly and reversibly to give [Pt3(µ3-H)2(µ-dppm)3]2+ and [Pt3(µ2-H)3(µ-dppm)3]3+; auration of (1) with LAu+(L = PPh3) gives [Pt3(µ3-H)(µ3-AuL)(µ-dppm)3]2+, which can be deprotonated to [Pt3(µ3-AuL)(µ-dppm)3]+ and then further aurated to [Pt3(µ3-AuL)2(µ-dppm)3]2+, thus providing a route to novel platinum cluster hydrides and showing clearly how electrophilic ligand substitution at the cluster can occur by a bimolecular, stepwise mechanism.