The crystal structure of a heterobimetallic crown ether complex: [Na(dibenzo-18-crown-6)][FeCl4]

Slow evaporation of a solution of ferric chloride and dibenzo-18-crown-6 in 31 CH₃CNCH₃OH produced single crystals of the title complex. This heterobimetallic crown ether complex, Na(dibenzo-18-crown-6)]FeCl₄], crystallizes in the monoclinic space group P2_t/n with cell parameters (at 22°C)a=14.608(6),b=10.466(9),c=17.276(9)Å, =91.47(6)°, andD _calc=1.46 g cm^–3 for Z=4. The structure consists of discrete ions with the shortest Na ... Cl distance a lengthy contact of 3.56(1)Å. The average Na...O separation is 2.69(3)Å. The FeCl₄]^– anion exhibits a distorted tetrahedral geometry with an average Fe–Cl bond length of 2.16(2)Å.