[Ph₄P]₂[Sb₂S₁₅]

The reaction of antimony chloride, sulfur and tetraphenylphosphonium bromide in an aqueous ammonia solution under hydrothermal conditions yields orange crystals of bis(tetraphenylphosphonium) [mu]-sufido-[mu]-tetrasulfido-S¹:S⁴-bis[(pentasulfido-S¹,S⁵)antimonate], [(C₆H₅)₄P]₂[Sb₂S₁₅]. The structure contains tricyclic molecular Sb₂S₁₅^2- anions built up of two distorted [psi]-trigonal bipyramidally coordinated antimony centres which are connected by two S_x^2- units (x = 1,4) and bound to an additional S₅^2- ligand.

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