Synthesis and coordination properties of palladium(II) and platinum(II) complexes with phosphonated triphenylphosphine derivatives |
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Authors: | Zbyněk Rohlík Jan Kotek Ivan Němec Ivan Lukeš |
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Institution: | a Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic b Department of Inorganic Technology, Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic |
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Abstract: | Two triphenylphosphine derivatives, diethyl 4-(diphenylphosphanyl)benzyl]phosphonate (3a) and tetraethyl {5-(diphenylphosphanyl)-1,3-phenylene]dimethylene}bis(phosphonate) (3b), and also the corresponding free acids 4a and 4b were prepared. These ligands were characterized by 1H, 13C and 31P NMR spectroscopy and mass spectrometry. A full set of their Pd(II) and Pt(II) complexes of the general formula MCl2L2] and one dinuclear complex trans-Pd2Cl4(3a)2] were synthesized and their isomerization behaviour in solution was studied. The complexes were characterized by 1H, 13C, 31P and 195Pt NMR spectroscopy, mass spectrometry and far-IR spectroscopy. The X-ray structures of all complexes with 3a or 3b have usual slightly distorted square-planar geometry on the metal ion. Salts of phosphonic acids 4a and 4b and their complexes are freely soluble in aqueous solution; therefore, they can be potentially useful in aqueous or biphasic catalysis. |
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Keywords: | Phosphonato phosphines Water soluble phosphines Phosphonate complexes Palladium complexes Platinum complexes Crystal structure determination Isomerism |
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