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Molecules 2006, 11(7), 528-538; doi:10.3390/molecules11070528
Article

Synthesis and Structure of a Sodium Complex of an Aromatic β-Diketone and Pyrazolylpyridine

1, 1, 2
,
1 and 1,*
1 Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal 2 Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, UK
* Author to whom correspondence should be addressed.
Received: 23 May 2006 / Accepted: 14 July 2006 / Published: 17 July 2006
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Abstract

Reaction of NaH with a THF solution of Eu(BTA)3(pypzH) [BTA = 1-benzoyl-3,3,3-trifluoroacetonate, pypzH = 2-(3-pyrazolyl)pyridine] leads to the formation of theeuropium-free tetrasodium complex [Na4(pypzH)2(μ4-BTA)2(μ2-BTA)2]. Single-crystal X-ray diffraction studies revealed the presence of a centrosymmetric Na hybrid tetramer,which fully occupies the contents of the triclinic unit cell. The crystal structure containstwo individual Na cations, Na(1) and Na(2), which have highly irregular {NaN2O3} and{NaO6} local coordination environments, respectively. One of the key features is thepresence of a central {Na4O6} core, which is unprecedented for Na . Externally to this{Na4O6} cluster pyrazolylpyridine organic molecules are N,N-chelated to Na(1). Eventhough all of the organic residues contain aromatic rings, the crystal packing of individualcentrosymmetric tetrasodium [Na4(pypzH)2(μ4-BTA)2(μ2-BTA)2] molecular moieties isessentially driven through geometrical aspects combined with weak C–H···π interactions,rather than the expected a priori π-π interactions. The material also contains classicalstrong hydrogen bonds, even though these do not directly contribute to the packingdriving forces.
Keywords: Sodium; bridging ligands; N ligands; O ligands; coordination modes; aggregation Sodium; bridging ligands; N ligands; O ligands; coordination modes; aggregation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Coelho, A.C.; Almeida Paz, F.A.; Klinowski, J.; Pillinger, M.; Gonçalves, I.S. Synthesis and Structure of a Sodium Complex of an Aromatic β-Diketone and Pyrazolylpyridine. Molecules 2006, 11, 528-538.

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