[Display omitted] The amantadinium iodoacetatobismuthate(III) [C 10 H 15 NH 3 ·(CH 3) 2 CO] 2 [BiI 3.67 (CH 3 COO) 1.33 ] is a new hybrid halometallate with iodide ions partially replaced by oxygen-containing acetates to form stronger interaction between the anionic and cationic substructures. The title compound as well-shaped orange-red crystals was synthesized by a facile reaction in acetone solution in the presence of glacial acetic acid. The crystal structure of the compound consists of the infinite anionic chains [BiI 3.67 (CH 3 COO) 1.33 ]2– and the countercations [C 10 H 15 NH 3 ·(CH 3) 2 CO]+; according to the optical absorption data, the test compound is a semiconductor with a band gap of 2.06 eV. [ABSTRACT FROM AUTHOR]