title: Discrete magnesium hydride aggregates: a cationic Mg13H18 cluster stabilized by NNNN-type macrocycles.
abstract: Large magnesium hydride aggregates [Mg13 (Me3 TACD)6 (μ2 -H12 )(μ3 -H6 )][A]2 ((Me3 TACD)H=1,4,7-trimethyl-1,4,7,10-tetraazacyclododecane; A=AlEt4 , AlnBu4 , B{3,5-(CF3 )2 C6 H3 }4 ) were synthesized stepwise from alkyl complexes [Mg2 (Me3 TACD)R3 ] (R=Et, nBu) and phenylsilane in the presence of additional Mg(II) ions. The central magnesium atom is octahedrally coordinated by six hydrides as in solid α-MgH2 of the rutile type. Further coordination to six magnesium atoms leads to a substructure of seven edge-sharing octahedra as found in the hexagonal layer of brucite (Mg(OH)2 ). Upon protonolysis in the presence of 1,2-dimethoxyethane (DME), this cluster was degraded into a tetranuclear dication [Mg2 (Me3 TACD)(μ-H)2 (DME)]2 [A]2 .
authors: Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen (Germany).
authors: Daniel
authors: D
authors: Martin
authors: Klaus
authors: K
authors: Beckerle
authors: Silvia
authors: S
authors: Schnitzler
authors: Thomas P
authors: TP
authors: Spaniol
authors: Laurent
authors: L
authors: Maron
authors: Jun
authors: J
authors: Okuda
keywords: cluster compounds; hydrides; hydrogen; macrocylic ligands; magnesium