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Water soluble platinum(II) and palladium(II) complexes of alkyl sulfonated phosphines |
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| Authors: | Janet L Wedgwood Ann P Hunter Roman A Kresinski Andrew W.G Platt Bridget K Stein |
| Affiliation: | a Chemistry Division, Staffordshire University, College Road, Stoke-on-Trent ST4 2DE, UK b EPSRC National Mass Spectrometry Service Centre, Chemistry Department, University of Wales, Swansea, Singleton Park, Swansea SA2 8PP, UK |
| Abstract: | The reactions of the alkylsulfonated phosphines LM=Ph2P(CH2)nSO3Na/K (n=2, 3, 4) with K2PtCl4 and K2PdCl4 have been studied in homogeneous aqueous solution as a function of pH. In homogeneous acidic solution the protonated phosphines react to give cis- and trans-PtCl2(LH)2. The biphasic reaction between 1,5-cyclooctadiene platinum(II) chloride in dichloromethane and acidified aqueous LNa/K gives a higher proportion of the cis isomer. In neutral solution the initial reaction to give [PtCl(LNa/K)3]+Cl− is followed by slow formation of cis-PtCl2(LNa/K)2. K2PdCl4 reacts more rapidly to give PdCl2(LNa/K)2. In homogeneous alkaline solution rapid oxidation of the phosphine occurs with only small amounts of platinum complex being observable. The biphasic reaction yields phosphine oxide in the aqueous layer and a small amount of the chelate complexes PtL2 in the organic. Representative complexes have been isolated and characterised and the mechanisms for the reactions discussed. The electrospray mass spectra of solutions of the isolated complexes have been recorded in both positive and negative ionisation modes. The positive ionisation spectra are complicated, but platinum and palladium containing ions derived from loss of chloride, H+ and HCl are observed in the negative ionisation spectra. |
| Keywords: | Platinum complexes Palladium complexes Water soluble complexes Alkyl sulfonated phosphine complexes |
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