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Organomagnesium clusters: Structure, stability, and bonding in archetypal models
Stockholm University, Faculty of Science, Department of Organic Chemistry.
2011 (English)In: Journal of Organometallic Chemistry, ISSN 0022-328X, E-ISSN 1872-8561, Vol. 696, no 25, 4104-4111 p.Article in journal (Refereed) Published
Abstract [en]

We have studied the molecular structure and the nature of the chemical bond in the monomers and tetramers of the Grignard reagent CH(3)MgCl as well as MgX(2) (X = H, Cl, and CH(3)) at the BP86/TZ2P level of theory. For the tetramers, we discuss the stability of three possible molecular structures of C(2h), D(2h), and T(d) symmetry. The most stable structure for (MgCl(2))(4) is D(2h), the one for (MgH(2))(4) is C(2h), and that of (CH(3)MgCl)(4) is T(d). The latter is 38 kcal/mol more stable with chlorines in bridge positions and methyl groups coordinated to a Mg vertex than vice versa. We find through a quantitative energy decomposition analysis (EDA) that the tetramerization energy is predominantly composed of electrostatic attraction Delta V(elstat) (60% of all bonding terms Delta V(elstat) + Delta E(oi)) although the orbital interaction Delta E(oi) also provides an important contribution (40%).

Place, publisher, year, edition, pages
2011. Vol. 696, no 25, 4104-4111 p.
Keyword [en]
Bond theory, Density functional calculations, Grignard reagents, Magnesium, Polar bonds
National Category
Inorganic Chemistry
URN: urn:nbn:se:su:diva-70642DOI: 10.1016/j.jorganchem.2011.06.014ISI: 000297152600028OAI: diva2:482978
authorCount :3Available from: 2012-01-24 Created: 2012-01-23 Last updated: 2012-01-24Bibliographically approved

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