Synthesis and X-ray characterization of an iodine-bridged tetranuclear gold cluster, di-µ-iodo-tetrakis(triphenylphosphine)-tetrahedro-tetragold

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Abstract
The reaction of[Au9(PPh3)8][NO3]3with KI in acetone yields [Au4(µ-I)2(PPh3)4] which has been shown by X-ray crystallography to contain a tetrahedral gold cluster connected to four terminal triphenylphosphine groups and two edge-bridging iodine ligands; the latter bonding mode is novel for gold clusters.