Anion-induced structural diversity in 12-crown-4 complexes of transition metal salts

摘要

The synthesis and X-ray crystal structures of eight transition metal complexes of 12-crown-4 are reported. These are: [Mn(H_2O)_6][Mn(12-crown-4)_2]_2(ClO_4)_6·6H_2O (1), [Ni(H_2O)_6](ClO_4)_2·12-crown-4 (2), [Zn(12-crown-4)_2]_2[Zn(H_2O)_6](ClO_4)_6·(12-crown-4)_2·(H_2O)_2 (3), [Mn(12-crown-4)_2][MnCl_4]·H_2O (4), [Co(12-crown-4)Cl(H_2O)]_2(ClO_4)·H_2O (5), [Zn(12-crown-4)_2][ZnCl_3(H_2O)]_2 (6), [Cu(Br)_2(12-crown-4)] (7) and [Cd(12-crown-4)(NO_3)_2] (8). Depending on the identity of the counter anion, the structures fall into three groups: (1) hydrogen bonded polymers; (2) sandwich M(12-crown-4)_2 carions alternating with transition metal contining anions; and (3) neutral molecular species incorporating 12-crown-4.