COMPLEXES OF 3RD GROUP ELEMENTS WITH [(EN)2M(III)(OH)2] LIGANDS (M=CR, CO)

Heteronuclear complexes are formed on reaction of cis-[(en)2M(III)(OH)(H2O)]2+ (M = Cr, Co; en = ethylenediamine) with A(III), Ga(III), In(III) and Tl(III) in aqueous solution. The following salts with tetranuclear cations have been isolated: [Al{(OH)2-Cr(en)2}3](S2O6)3 . 13 H2O (1), [Al{(OH)2Co(en)2}3](S2O6)3 . 5 H2O (2), [Ga{(OH)2Co(en)2}3](S2O6)3 . 5 H2O (3), [In((OH)2-Cr(en)2}3](S2O6)3 . 6 H2O (5), and [In{(OH)2Co(en)2}3]-(ClO4)4Cl2 . 4 H2O (6). Furthermore, the dinuclear neutral complexes [InCl4{(OH)2Cr(en)2}] (4) and [TlCl4{(OH)2-Cr(en)2}] - 0.5 H2O (7) are prepared. X-ray analyses confirm that in all cases the [(en)2M(III)(OH)2] groups act as bidentate ligands in the hydroxo-bridged heterometallic complexes.