Magnesium alcoholates as precursors for magnesia

Abstract

The synthesis, structural aspects and thermal behaviour of six different magnesium alcoholates are reported. The magnesium oxides obtained by decomposition of the alkoxides show different particle morphologies, as shown by scanning electron microscopy. The mechanism of the thermal decomposition of magnesium methanolate was studied in detail. The substance decomposed in three steps at 90, 330-350 and 360-400 "C. Two intermediates were characterized by elementary analysis (C, H) and IR spectroscopy.

Synthesis and Structural Characterization of a Novel Magnesium β‐Diketonatoalkoxide Complex: A New Precursor for the MOCVD of MgO

“…In common with other Mg alcoholates, [13] there is some disorder in the crystal as well as disorder associated with the t Bu groups. Full structural data for 1 is given in Table 1, and selected bond lengths and angles are shown in Tables 2 and 3, respectively.…”

“…The molecular structure of [Mg(thd)(m 3 -OMe)(MeOH)] 4 (1) was determined by X-ray diffraction (XRD) and is shown in Figure 1. The structure comprises a tetrahedron of magnesium atoms face-bridged by triply bridging m 3 -methoxide groups, generating a [Mg±O±Me] hetero-cubane core, similar to that in [Mg(OMe)(m 3 -OMe)(MeOH) 1,2 ] 4 [12] and related structures, [13] and analogous to the [Ca±O±Et] core in [Ca(thd)(m 3 -OEt)(EtOH)] 4 . [11] Similar hetero-cubane structures have also been observed in some barium alkoxides, [14] alkyl magnesium alkoxides, [15] and metal±or-ganic compounds such as methyl lithium.…”

Non-aqueous sol–gel synthesis of nano-structured metal fluorides

“…Magnesium fluoride is considered as a non-acidic metal fluoride and obtained by the sol-gel reaction similarly, e.g., from the methoxide solvate Mg(OCH 3 ) 2 Á2CH 3 OH [35], which structure is that of a tetrameric Mg-O-heterocubane spatial arrangement with oxygen in bridging and terminal positions. Thus, the above described calculation model can principally be applied to the related structure of the magnesium alkoxide and probably others, too.…”

Thermochemistry of alkaline-earth phenoxides

“…ð2Þ Assuming that the bonds in an alkaline-earth metal phenoxide compound are essentially ionic (many metal-organic compounds are not ionic crystals but their bonds still essentially ionic in nature) [12][13][14], it was possible to define the corresponding lattice energy, D lat U [M(OR) 2 ], as the internal energy change associated with the following process: MðORÞ 2 ðcrÞ ! M 2þ ðgÞ þ 2RO À ðgÞ ðM ¼ alkaline earth metal; R ¼ phenyl groupÞ:…”