More than Steric Effects: Unlocking the Coordination Chemistry of Barium Pyrazolates

To further our understanding of the coordination chemistry of the heavy alkaline earth metals, we here report on a family of barium pyrazolates bearing various substitution patterns that illustrate the delicate balance between ligand bulk, donor size, stoichiometry, and hapticity, while emphasizing...

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Bibliographic Details
Published in:European Journal of Inorganic Chemistry 2008-01, Vol.2008 (1), p.172-182
Main Authors: O'Brien, Anna Y., Hitzbleck, Julia, Torvisco, Ana, Deacon, Glen B., Ruhlandt-Senge, Karin
Format: Article
Language:English
Subjects:
Barium
Coordination modes
CVD precursors
N ligands
Pyrazolates
Structure elucidation
Synthetic methods
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Summary:To further our understanding of the coordination chemistry of the heavy alkaline earth metals, we here report on a family of barium pyrazolates bearing various substitution patterns that illustrate the delicate balance between ligand bulk, donor size, stoichiometry, and hapticity, while emphasizing the importance of secondary interactions including π‐bonding, agostic interactions, and hydrogen bonding to stabilize these heavy‐metal complexes. The dimeric compounds [{Ba(Me2pz)2(pmdta)}2] (1), [{Ba(Phpz)2(pmdta)}2] (2), [{Ba(tBupz)2(pmdta)}2] (3), [{Ba(MePhpz)2(tmeda)}2] (5), [{Ba(Ph2pz)2(tmeda)}2]·TMEDA (6), the polymer [{Ba(tBupz)2(NH3)2}n] (4), and the monomer [Ba(Ph2pz)2(tmeda)2]·TMEDA (7), were prepared using a variety of synthetic methods and were characterized spectroscopically and structurally. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.200701020