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The title compound, [Nb6Cl12I2(H2O)4]·8THF (THF is tetrahydrofuran, C4H8O), comprises an uncharged niobium cluster unit surrounded by THF solvent molecules. The edges of the {Nb6} octahedron are μ2-coordinated by twelve chlorido ligands. Four in-plane (equatorial plane) aqua ligands and two iodido ligands coordinating above and below the plane are bound at the corners of the {Nb6} atomic octahedron. O—H...O hydrogen bonds are formed between the aqua ligands and the THF solvent molecules; one THF molecule is disordered over two positions with the major component having a site occupancy of 0.64 (2).