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.
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Demartin et al. (1981) studied this question.
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