Reversible CO exchange at platinum(0). An example of similar complex properties produced by ligands with very different stereoelectronic characteristics

Sebastian J K Forrest, Paul G. Pringle*, Hazel A. Sparkes, Duncan F. Wass

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

10 Citations (Scopus)

Abstract

The ligands 1,2-C6H4(CH2PtBu2)2 (La) and 1,2-C6H4(PtBu2)(CH2PtBu2) (Lb) displace norbornene (nbe) from [Pt(η2-nbe)3] to give [PtL(η2-nbe)] where L = La (1a) or Lb (1b); 1a is fluxional on the NMR timescale. Reaction of 1a,b with CO gives the corresponding monocarbonyls [PtL(CO)] where L = La (2a) or Lb (2b) which then react further, and reversibly, to give the dicarbonyls [PtL(CO)2] where L = La (3a) or Lb (3b). The CO interchange between 2a,b and 3a,b is compared with the only other such system (2f and 3f), which are complexes of (C2F5)2PCH2CH2P(C2F5)2 (Lf). Ethene reacts smoothly with 2a to give (4a) and H2 with 2a generates some [PtH2(La)]. Protonation of 2a gives [Pt(La)(H)(CO)][B(C6F5)4] (5a) whose crystal structure has been determined. Similarly protonation of 2b gives [Pt(Lb)(H)(CO)][B(C6F5)4] as a mixture of geometric isomers 5b-6b.

Original languageEnglish
Pages (from-to)16335-16344
Number of pages10
JournalDalton Transactions
Volume43
Issue number43
DOIs
Publication statusPublished - 21 Nov 2014

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