Loading...
Further studies on the chemistry of molybdenyl adducts of [Pt₂(μ-S)₂(PPh₃)₄]: Hydrolysis, condensation and ligand exchange processes
Abstract
Reaction of [Pt₂(μ-S)₂(PPh₃)₄] with [MoO₂(acac)₂] in methanol gives the known five-coordinate Mo(VI) adduct [Pt₂(μ-S)₂(PPh₃)₄MoO₂(OMe)]⁺ isolated as its PF₆⁻, BPh₄⁻ and [Mo₈O₂₆]₄⁻ salts; the latter was structurally characterised, the polymolybdate anion being the uncommon γ form. Hydrolysis of [Pt₂(μ-S)₂(PPh₃)₄MoO₂(OMe)]⁺ in wet dichloromethane initially produces [Pt₂(μ-S)₂(PPh₃)₄MoO₂(OH)]⁺ and subsequently the bright yellow oxo-bridged dimolybdenum species [{Pt₂(μ-S)₂(PPh₃)₄MoO₂}₂O]₂⁺, structurally characterised as its tetraphenylborate salt, and found to contain two five-coordinate molybdenum centres. [{Pt₂(μ-S)₂(PPh₃)₄MoO₂}₂O]₂⁺ can be prepared directly from [Pt₂(μ-S)₂(PPh₃)₄] and [MoO₂(acac)₂] in wet MeCN. Slow reconversion to [Pt₂(μ-S)₂(PPh₃)₄MoO₂(OMe)]⁺ occurs when [{Pt₂(μ-S)₂(PPh₃)₄MoO₂}₂O]₂⁺ is dissolved in methanol. [Pt₂(μ-S)₂(PPh₃)₄MoO₂(OMe)]⁺ undergoes alkoxide exchange in dichloromethane-alcohol solutions to give [Pt₂(μ-S)₂(PPh₃)₄MoO₂(OR)]⁺ species (R = e.g. n-octyl). These reactions are easily monitored using electrospray ionisation mass spectrometry.
Type
Journal Article
Type of thesis
Series
Citation
Henderson, W., Nicholson, B.K., Bridson, J.H. & Kueh, J.T. (2011). Further studies on the chemistry of molybdenyl adducts of [Pt₂(μ-S)₂(PPh₃)₄]: Hydrolysis, condensation and ligand exchange processes. Inorganica Chimica Acta, available online 7 May 2011.
Date
2011
Publisher
Elsevier
Degree
Supervisors
Rights
This is an author’s accepted version of an article published in the journal: Inorganica Chimica Acta. © 2011 Elsevier.