Polycations Stabilised by Borosulfates: [Au3Cl4][B(S2O7)2] and the One‐Dimensional Metal [Au2Cl4][B(S2O7)2](SO3)

(SO4)‐rich silicate analogue borosulfates are able to stabilise cationic cluster‐like and chain‐like aggregates. Single crystals of [Au3Cl4][B(S2O7)2] and [Au2Cl4][B(S2O7)2](SO3) were obtained by solvothermal reaction with SO3, and the electronic properties were investigated by means of density functional theory–based calculations. [Au3Cl4][B(S2O7)2] exhibits a cluster‐like cation, and the cationic gold‐chloride strands in [Au2Cl4][B(S2O7)2](SO3) are found to resemble one‐dimensional metallic wires. This is confirmed by polarisation microscopy. A different dimension: The borosulfates [Au3Cl4][B(S2O7)2] and [Au2Cl4][B(S2O7)2](SO3) were obtained through the reaction of AuCl3 with and in SO3. The [B(S2O7)2]− anions serve as charge compensation for cluster‐like and chain‐like polycations. The latter are found in [Au2Cl4][B(S2O7)2](SO3) and resemble one‐dimensional metals according to DFT‐based quantum‐chemical calculations. This is confirmed experimentally by polarisation microscopy.