Anionic, cationic, and neutral: Gaseous gold dihalides can exist in three different oxidation states, namely: AuX2−, AuX2, and AuX2+ (see scheme; X=Cl, Br). The dihalide structure is strongly preferred for anionic and neutral species, whereas experiment and theory suggest the presence of XX bonds in the cations.
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Schröder et al. (2003) studied this question.
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