Polyol-Metall-Komplexe, 43 [1]. Galactarato-Komplexe mit Aluminium und Kupfer(II) / Polyol Metal Complexes, 43 [1]. Galactarato Complexes with Aluminium and Copper(II)

Na6[Al6(Gal1,6A21,2,5,6H−4)4(OH)8] ∙ 21 H2O (1) crystallizes from alkaline aqueous solutions of galactaric acid (Gal1,6A2) and aluminium nitrate. Crystal structure analysis (P1̄, a = 9.09950(10), b = 15.1996(2), c = 21.9667(3) Å , α = 96.6190(5), β = 90.5307(4), γ = 103.5658(5)°, V = 2931.66(6) Å3, Z = 2) and solid state 27Al NMR spectroscopy reveal rings of six edge-sharing AlO6 octahedra, the O-atoms stemming from four galactarato and eight hydroxo ligands. The potassium homologue K6[Al6(Gal1,6A21,2,5,6H−4)4(OH)8] ∙ 23 H2O (2) is not isotypic (P21/c, a = 9.7604(6), b = 22.0843(17), c = 30.1534(17) Å , β = 95.970(7)°, V = 6464.4(7) Å3, Z = 4), but the anion structure is the same. Pure polyolato coordination of entirely deprotonated galactarate has been found in Na4[Cu(Gal1,6A2H−6)]] ∙ 12 H2O (3). In 3, a coordination polymer is formed by the copper atoms and the erythro-bis-diolate ligand (P1̄, a = 5.9711(2), b = 9.5319(3), c = 9.7794(3) Å , α = 99.883(2), β = 100.807(2), γ = 105.9182(11)°, V = 510.90(3) Å3, Z = 1).