A Molecular Chain of Four CoII Ions Stabilized by a Tris-Pyridyl/Bis-β-Diketonate Ligand

Leoní A. Barrios; David Aguilà; Olivier Roubeau; Keith S. Murray; Guillem Aromí

doi:10.1071/CH09183

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A Molecular Chain of Four Co^II Ions Stabilized by a Tris-Pyridyl/Bis-β-Diketonate Ligand

Leoní A. Barrios ^A , David Aguilà ^A , Olivier Roubeau ^B , Keith S. Murray ^C and Guillem Aromí ^A ^D

+ Author Affiliations

- Author Affiliations

^A Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain.

^B Instituto de Ciencia de Materiales de Aragón, CSIC and Universidad de Zaragoza, Plaza San Francisco s/n, 50009 Zaragoza, Spain.

^C School of Chemistry, Building 23, Monash University, Clayton, Vic. 3800, Australia.

^D Corresponding author. Email: guillem.aromi@qi.ub.es

Australian Journal of Chemistry 62(9) 1130-1136 https://doi.org/10.1071/CH09183
Submitted: 1 April 2009 Accepted: 25 April 2009 Published: 17 September 2009

Abstract

The synthesis and characterization of a tris-pyridyl/bis-β-diketone molecule (H₂L) is reported. This compound acts as a hexadentate ligand towards Co^II to facilitate the assembly of a tetranuclear molecular chain of closely spaced metals with formula [Co₄L₂(MeOH)₈](NO₃)₄ (1), which exhibits a very flat [Co₄L₂]⁴⁺ platform, as determined by single-crystal X-ray diffraction crystallography. Complex 1 readily exchanges axial methanol ligands with water molecules. The bulk magnetization of the resulting hydrate, 1a, shows that the metals in the [Co₄L₂]⁴⁺ moiety exhibit spin-orbit coupling and antiferromagnetic exchange interactions.

Acknowledgements

G.A. thanks the AGAUR (Generalitat de Catalunya) for a Mobility Research Fellowship. G.A., L.B., and D.A. thank the Spanish Ministry of Science and Education for financial support. O.R. thanks the Spanish National Research Council (CSIC) for financial support. K.S.M. thanks the Australian Research Council for a Discovery Grant. The authors thank Dr Irene Fernández from the Unitat d’Espectrometria de Masses (SSR) University of Barcelona and Prof. Christine McKenzie from Syddansk Universitet for extensive help and assistance during the interpretation of mass spectrometry experiments.

References

A Molecular Chain of Four CoII Ions Stabilized by a Tris-Pyridyl/Bis-β-Diketonate Ligand

Abstract

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A Molecular Chain of Four Co^II Ions Stabilized by a Tris-Pyridyl/Bis-β-Diketonate Ligand