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Synthetic and ESI mass spectrometric investigations of Pt, Pd, Ir, Ru and Rh complexes of a polyether-functionalised thiourea ligand.


Reaction of PhNCS with the polyetheramine Jeffamine® M600 H2NCHMeCH2(OCHMeCH2)nOCH2CH2OMe gave the polyether-functionalised thiourea PhNHC(S)NHCHMeCH2(OCHMeCH2)nOCH2CH2OMe. Neutral bis(phosphine) platinum(II) and palladium(II) complexes [M{SC(NPh)N(CHMeCH2(OCHMeCH2)nOCH2CH2OMe)}(PPh3)2], containing the thiourea dianion ligand, were prepared by reaction of [MCl2(PPh3)2] (M = Pt, Pd) with the thiourea and Me3N base in refluxing methanol. Closely related cationic complexes containing thiourea monoanion ligands were isolated by addition of NaBPh4 to the reaction mixtures. Corresponding organo-ruthenium, -iridium and -rhodium complexes were prepared by the reaction of [(η6-p-cymene)RuCl2]2 or (Cp*MCl2)2 (M = Ir, Rh; Cp* = 5-C5Me5) with the thiourea. Positive-ion ESI mass spectrometry was shown to be a convenient and powerful technique for the investigation of these complexes. A model Rh complex was also prepared from the short-chain analogue PhNHC(S)NHCH2CH2OMe.

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