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The gold(I) complexes (pip)2Au+Cl- and (Cy2NH)AuCl (pip=piperidine, Cy=cyclohexyl) crystallise as loose dimers; in the ionic species N–H···Cl- hydrogen bonding is the main secondary interaction, whereas in the neutral complex the N–H···Cl hydrogen bonding is weaker but is compensated by an auriophilic interaction.
Jones et al. (Thu,) studied this question.