title: Crystal structure of hexa-kis-(dmpu)-di-μ2-hydroxido-dialuminium tetraiodide dmpu tetra-solvate [dmpu is 1,3-di-methyl-tetra-hydro-pyrimidin-2(1H)-one]: a centrosymmetric dinuclear aluminium complex containing AlO5 polyhedra.
abstract: The structure of the title compound, [Al2(OH)2(C6H12N2O)6]I4·4C6H12N2O (systematic name: di-μ2-hydroxido-bis-{tris-[1,3-di-methyl-tetra-hydro-pyrimidin-2(1H)-one-κO]aluminium} tetra-iodide 1,3-di-methyl-tetra-hydro-pyrimidin-2(1H)-one tetra-solvate), is composed of two Al(C6H12N2O)3 moieties linked into a centrosymmetric dinuclear unit by a pair of bridging hydroxide ions. The aluminium cations show a distorted trigonal bipyramidal AlO5 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 mol-ecules and the iodide counter-anions inter-act with the complex cation by weak non-classical C-H⋯I and C-H⋯O hydrogen bonds.
authors.affiliation: Department of Chemistry and Biotechnology, PO Box 7015, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden.
authors.forename: Daniel
authors.initials: D
authors.lastname: Lundberg
authors.affiliation: Institute of Nuclear Chemistry and Technology, Dorodna 16, PL-03-195 Warsaw, Poland.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Lyczko
keywords: crystal structure; dmpu; five-coordination; group 13 metals; space-demanding solvent