Abstract
Phosphine exchange at square-planar trans-Pt(SnPh3)2(PMe2Ph)2 has been studied by 31P NMR spectroscopy as a function of ligand concentration and temperature in C6D6 using magnetisation transfer techniques. Exchange of a specific phosphine takes place according to a second order rate law with kex298 = 33.1 ± 3 dm3 mol−1 s−1, ΔH‡ = 24.4 ± 7 kJ mol−1 and ΔS‡ = −131 ± 23 J K−1 mol−1. The highly negative activation entropy and the rate law indicate an associative mode of activation. In spite of the overall large steric requirements of the four tertiary ligands the activation parameters indicate a fairly closed transition state, possibly due to an electronic stabilisation of the transition state by the π-acidic stannyl ligands.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Chemical Society, Dalton Transactions
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
