Precipitation of Spherical Magnesium(II) Cresolate Particles
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- 作者：Timothy J. Boyle ; Eric N. Coker ; Cecilia A. Zechmann ; James A. Voigt ; Mark A. Rodriguez ; Richard A. Kemp ; and Michael Zum Mallen
- 刊名：Chemistry of Materials
- 出版年：2003
- 出版时间：January 14, 2003
- 年：2003
- 卷：15
- 期：1
- 页码：309 - 319
- 全文大小：756K
- 年卷期：v.15,no.1(January 14, 2003)
- ISSN：1520-5002
文摘
Magnesium bis-o-cresol (or o-methylphenoxide), [Mg(oMP)2]n (1), was prepared througha variety of synthetic routes that involved the stoichiometric reaction of o-methylphenol(H-oMP), with Mg(Bu)2, Mg{N(Si(CH3)3)2}2(THF)2, or the bulk metal (Mg0). In all cases thelow-temperature product was found to be soluble, while precipitation occurred at highertemperatures. The precipitate could only be redissolved by the addition of pyridine or asimilarly strongly coordinating Lewis base. The pyridine and NH3 adducts of 1 were isolatedas monomeric species, whereas the THF adduct proved to be the dimeric [Mg(
ages/entities/mgr.gif">-oMP)(oMP)(THF)2]2, 2. For a limited set of conditions, sufficient control over the precipitation kineticsof the reaction between Mg(Bu)2 and H-oMP was realized to yield spherical morphologies.The window of spherulitic growth was small and could only be partially controlled by varyingreaction conditions during the precipitation. Use of seed particles to control nucleation eventsduring precipitation was found to lead to increased monodispersity of spherical [Mg(oMP)2]nprecipitate powders.