Crystal structure of hexa­kis­(dmpu)-di-μ(2)-hydroxido-dialuminium tetraiodide dmpu tetra­solvate [dmpu is 1,3-di­methyl­tetra­hydro­pyrimidin-2(1H)-one]: a centrosymmetric dinuclear aluminium complex containing AlO(5) polyhedra

The structure of the title compound, [Al(2)(OH)(2)(C(6)H(12)N(2)O)(6)]I(4)·4C(6)H(12)N(2)O (systematic name: di-μ(2)-hydroxido-bis­{tris­[1,3-di­methyl­tetra­hydro­pyrimidin-2(1H)-one-κO]aluminium} tetra­iodide 1,3-di­methyl­tetra­hydro­pyrimidin-2(1H)-one tetra­solvate), is composed of two Al(C(6)H(12)N(2)O)(3) moieties linked into a centrosymmetric dinuclear unit by a pair of bridging hydroxide ions. The aluminium cations show a distorted trigonal bipyramidal AlO(5) coordination environment formed only by monodentate ligands. The Al—O bond lengths are in the range 1.789 (2)–1.859 (2) Å (mean bond length = 1.818 Å). The non-coordinating iodide anions compensate the charge of the complex cation. The remaining solvent mol­ecules and the iodide counter-anions inter­act with the complex cation by weak non-classical C—H⋯I and C—H⋯O hydrogen bonds.