Volume 634, Issue 8 pp. 1301-1308
Article

Zur Reaktivität von alkylthioverbrückten 44-CVE-triangularen Platinclustern: Umsetzungen mit bidentaten Phosphanliganden

Christian Albrecht

Christian Albrecht

Halle/Saale, Institut für Chemie der Universität

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Clemens Bruhn

Clemens Bruhn

Kassel, Institut für Chemie der Universität

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Christoph Wagner

Christoph Wagner

Halle/Saale, Institut für Chemie der Universität

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Dirk Steinborn Prof. Dr.

Corresponding Author

Dirk Steinborn Prof. Dr.

Halle/Saale, Institut für Chemie der Universität

Martin-Luther-Universität Halle-Wittenberg, Institut für Chemie Anorganische Chemie, Kurt-Mothes-Straße 2, D-06120 Halle / GermanySearch for more papers by this author
First published: 26 May 2008
Citations: 4

Professor Heinrich Nöth zum 80. Geburtstag gewidmet

Abstract

On the Reactivity of Alkylthio Bridged 44 CVE Triangular Platinum Clusters: Reactions with Bidentate Phosphine Ligands

The 44 cve (cluster valence electrons) triangular platinum clusters [{Pt(PR3)}3(μ-SMe)3]Cl (PR3 = PPh3, 2a; P(4-FC6H4)3, 2b; P(n-Bu)3, 2c) were found to react with PPh2CH2PPh2 (dppm) in a degradation reaction yielding dinuclear platinum(I) complexes [{Pt(PR3)}2(μ-SMe)(μ-dppm)]Cl (PR3 = PPh3, 3a; P(4-FC6H4)3, 3b; P(n-Bu)3; 3e) and the platinum(II) complex [Pt(SMe)2(dppm)] (4), whereas the addition of PPh2CH2CH2PPh2 (dppe) to cluster 2a afforded a mixture of degradation products, among others the complexes [Pt(dppe)2] and [Pt(dppe)2]Cl2. On the other hand, the treatment of cluster 2a with PPh2CH2CH2CH2PPh2 (dppp) ended up in the formation of the cationic complex [{Pt(dppp)}2(μ-SMe)2]Cl2 (5). Furthermore, the terminal PPh3 ligands in complex 3a proved to be subject to substitution by the stronger donating monodentate phosphine ligands PMePh2 and PMe2Ph yielding the analogous complexes [{Pt(PR3)}2(μ-SMe)(μ-dppm)]Cl (PR3 = PMePh2, 3c; PMe2Ph, 3d). NMR investigations on complexes 3 showed an inverse correlation of Tolmans electronic parameter ν with the coupling constants 1J(Pt,P) and 1J(Pt,Pt). All compounds were fully characterized by means of NMR and IR spectroscopy. X-ray diffraction analyses were performed for the complexes [{Pt{P(4-FC6H4)3}}2(μ-SMe)(μ-dppm)]Cl (3b), [Pt(SMe)2(dppm)] (4), and [{Pt(dppp)}2(μ-SMe)2]Cl2 (5).

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