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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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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