Abstract: | The reaction of [AuIII(mnt)2]? with (n‐Bu4N)[BH4] in acetone leads to the formation of [AuII(mnt)2]2?, which is the second stable mononuclear AuII complex characterized by X‐ray structure analysis. (n‐Bu4N)2[AuII(mnt)2] crystallizes triclinic, P (a = 904.24(5), b = 989.55(5), c = 1627.35(10) pm, α = 92.040(7), β = 94.937(7), γ = 107.220(6)°, Z = 1) with two molecules acetone per unit cell. The anion is planar. From EPR investigations using single crystals of (n‐Bu4N)2[AuII(mnt)2] the g tensor components were derived. Information about magnetic exchange interactions were obtained from line width analyses. |