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.
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Jones et al. (1998) studied this question.
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