The salts Cs-4[Re6S8(OH)(6)]center dot 6H(2)O (1) and Cs-4[Re6Se8(OH)(6)]center dot 8H(2)O (2) were obtained by the reactions of Re6S8Br2 and Re6Se8Br2 with a CsOH melt with further solution of the products in water and crystallization of 1 and 2 from the aqueous solutions. The structure of the compounds was established by X-ray single crystal diffraction analysis. Compound 1 crystallizes in the orthorhombic space group Pbca with unit cell parameters a = 14.175(2) angstrom, b = 11.321(2) angstrom, c = 17.503(2) angstrom, V = 2808.5(7) angstrom(3), Z = 4, d(calc) = 5.003 g/cm(3); compound 2 crystallizes in the triclinic space group P (1) over bar with unit cell parameters a = 9.020(4) angstrom, b = 9.127(4) angstrom, c = 10.289(4) angstrom, alpha = 79.589(7)degrees, beta = 75.829(7)degrees, gamma = 72.186(7)degrees, V = 776.8(6) angstrom(3), Z = 1, d(calc) = 5.402 g/cm(3).