Synthesis and structural characterisation of the mixed metal clusters [Rh2Pt3(μ-CO)5(CO)4(PPh3)3] and [Rh2Pt2(μ-CO)3(CO)4(PPh3)3]; crystal structure of [Rh2Pt3(μ-CO)5(CO)4(PPh3)3] †
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Abstract
Two novel mixed metal rhodium–platinum clusters have been synthesized by the reaction of [Rh4(CO)12] with [Pt(PPh3)3]. The structure of [Rh2Pt3(µ-CO)5(CO)4(PPh3)3] 1 has been established by a single crystal X-ray diffraction study. The tetranuclear cluster [Rh2Pt2(µ-CO)3(CO)4(PPh3)3] 2 has been characterised by FAB mass spectrometry and shown by various multinuclear NMR techniques (13C, 31P, {31P–31P} COSY and {13C–103Rh} and {31P–103Rh} heteronuclear multiple quantum coherence, HMQC) to adopt a butterfly type structure. The carbonyl migration pathways in 2 have been established by a combination of EXSY and 1-D variable temperature measurements; independent localised exchange about the hinge rhodium atoms and interchange of bridging and semi-bridging carbonyls on the Pt–Rh bonds occur.
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