Two new bis(aryl-imino)-acenaphthene, Ar-BIAN (Ar = 2,4,6-trimethylphenyl = mes) ligands, bearing the NO 2 group in the naphthalene moiety of the iminoacenaphthene at para-(5-NO 2 ) and meta-(4-NO 2 ) position, of formulations 1,2bis(mes-imino)-5-nitroacenaphthene, 1, and 1,2-bis(mes-imino)-4-nitroacenaphthene, 2, were synthesized. Their respective dinuclear iodide bridged copper(I) complexes [Cu 2 (μ-I) 2 (mes-BIAN-5-NO 2 ) 2 ], 3 and [Cu 2 (μ-I) 2 (mes-BIAN-4-NO 2 ) 2 ] , 4, were obtained in good yields by treatment with an equimolar amount of CuI. All compounds were characterized by elemental analysis, [a