A new type of metal sandwich structure [Ag{[Au(µ-N3,C2- bzim)]3}2]BF4·CH2Cl2 1, is formed by reacting the neutral, triangular cluster [Au(µ-N3,C2-bzim)]3 with Ag+; these units stack with two short intermolecular Au···Au distances of ca. 3.2 Å.
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Burini et al. (1998) studied this question.