The title complex comprises two Ni(2+) ions, four fluorinated ligands and two water molecules in a centrosymmetric dinuclear complex. This compound was crystallized from benzene-CH(2)Cl(2), and two types of crystals, viz. the title benzene tetrasolvate, [Ni(2)(C(15)HF(10)O(2))(4)(H(2)O)(2)].4C(6)H(6), (I), and the previously reported benzene disolvate, [Ni(2)(C(15)HF(10)O(2))(4)(H(2)O)(2)].2C(6)H(6), (II) [Hori et al. (2009). Bull. Chem. Soc. Jpn, 82, 96-98], were obtained as pseudopolymorphs. In the crystal structure of (I), the four benzene solvent molecules interact closely with all the pentafluorophenyl groups of the complex through arene-perfluoroarene interactions. The molecular structures of the two compounds show essentially the same conformation, although the benzene molecules are accommodated in a columnar packing in (I), while they are isolated from each other in (II).