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Issue 17, 2015
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Polydentate chalcogen reagents for the facile preparation of Pd2 and Pd4 complexes

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Abstract

The silylated organochalcogen reagents 1,2-(Me3SiSCH2)2C6H4, 1a and 1,2-(Me3SiSeCH2)2C6H4, 1b were prepared from the corresponding organobromides and lithium trimethylsilanechalcogenolate Li[ESiMe3] (E = S, Se). They have been characterized by multinuclear NMR spectroscopy (1H, 13C, 77Se) and electrospray ionization mass spectrometry. 1a and 1b react under mild conditions with (1,3-bis(diphenylphosphino)propane)palladium(II) chloride, [PdCl2(dppp)], to provide the dinuclear organochalcogenolate-bridged complexes [(dppp)2Pd2-μ-κ2S-{1,2-(SCH2)2C6H4}]X2, [2a]X2 and [(dppp)2Pd2-μ-κ2Se-{1,2-(SeCH2)2C6H4}]X2, [2b]X2 (X = Cl, Br) in good yield, respectively. Furthermore, the tetranuclear palladium complex [(dppp)4Pd4-μ-κ4S-{1,2,4,5-(SCH2)4C6H2}]X4, [3]X4 (X = Cl, Br) can be synthesized from the reaction of the tetrathiotetrasilane 1,2,4,5-(Me3SiSCH2)4C6H2, and [PdCl2(dppp)]. The structures of [2a]X2, [2b]X2 and [3]X4 were determined by single crystal X-ray diffraction methods. A variety of NMR experiments including two-dimensional homonuclear and heteronuclear correlated spectra were used to probe the solution behaviour of the dinuclear complexes in more detail. These complexes were further characterized by electrospray ionization (ESI) mass spectrometry, and for [2a]X2 and [2b]X2, UV–Vis absorption spectroscopy.

Graphical abstract: Polydentate chalcogen reagents for the facile preparation of Pd2 and Pd4 complexes

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Publication details

The article was received on 16 Jan 2015, accepted on 23 Mar 2015 and first published on 08 Apr 2015


Article type: Paper
DOI: 10.1039/C5DT00197H
Citation: Dalton Trans., 2015,44, 8267-8277
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    Polydentate chalcogen reagents for the facile preparation of Pd2 and Pd4 complexes

    M. Azizpoor Fard, M. J. Willans, B. Khalili Najafabadi, T. I. Levchenko and John. F. Corrigan, Dalton Trans., 2015, 44, 8267
    DOI: 10.1039/C5DT00197H

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