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More than Steric Effects: Unlocking the Coordination Chemistry of Barium Pyrazolates
Author(s) -
O'Brien Anna Y.,
Hitzbleck Julia,
Torvisco Ana,
Deacon Glen B.,
RuhlandtSenge Karin
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200701020
Subject(s) - chemistry , steric effects , agostic interaction , barium , alkaline earth metal , coordination complex , ligand (biochemistry) , hydrogen bond , monomer , stoichiometry , organometallic chemistry , chirality (physics) , crystallography , stereochemistry , inorganic chemistry , metal , polymer , crystal structure , molecule , organic chemistry , biochemistry , receptor , nambu–jona lasinio model , chiral symmetry breaking , physics , quantum mechanics , quark
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(Me 2 pz) 2 (pmdta)} 2 ] ( 1 ), [{Ba(Phpz) 2 (pmdta)} 2 ] ( 2 ), [{Ba( t Bupz) 2 (pmdta)} 2 ] ( 3 ), [{Ba(MePhpz) 2 (tmeda)} 2 ] ( 5 ), [{Ba(Ph 2 pz) 2 (tmeda)} 2 ] · TMEDA ( 6 ), the polymer [{Ba( t Bupz) 2 (NH 3 ) 2 } n ] ( 4 ), and the monomer [Ba(Ph 2 pz) 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)