The heterometallic alkoxide catena-poly[[tetra-mu(2)-tert-butoxo-1: 2 kappa(4) O: O; 1: 3 kappa(4) O: O-bis( tetrahydrofuran)-2 kappa O,3 kappa O-iron(III)dilithium( I)]-mu-bromo], [FeLi2Br(C4H9O)(4)(C4H8O)(2)](n), forms a one-dimensional chain through an a-glide. This conformation is achieved through the formation of Fe-III/O/Li/O rings and Li - Br - Li bridges.