Synthesis, structure and reactions of a palladium cluster compound containing bound acetonitrile, [Pd4(µ-SO2)2(µ3-SO2)(MeCN)(PPh3)4]
Abstract
The cluster compound [Pd5(µ-SO2)2(µ3-SO2)2(PPh3)5]1a reacts with acetonitrile to give a tetranuclear compound [Pd4(µ-SO2)2(µ3-SO2)(MeCN)(PPh3)4]2a. Compound 2a has been characterised by a single-crystal X-ray analysis, and shown to have a butterfly arrangement of palladium atoms with Pd–Pd bond distances between 2.754(1) and 2.969(1)Å. Comparison of the solid-state cross-polarisation magic angle spinning 31P-{1H} NMR spectrum with the low-temperature solution 31P-{1H} spectrum indicates that this structure is maintained in solution. However, at room temperature, solutions of 2a revert back to 1a. Like the triangulo-osmium clusters [Os3(CO)11(MeCN)] and [Os3(CO)10(MeCN)2], it has proved possible to replace the labile acetonitrile ligand, and [Pd5(µ-SO2)2(µ3-SO2)2(PMePh2)5]1b can be converted into [Pd4(µ-SO2)2(µ3-SO2)(PMePh2)5]3via the compound [Pd4(µ-SO2)2(µ3-SO2)(MeCN)(PMePh2)4]2b.
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