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

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Contents Vol 62(9)

doi:10.1071/CH09183

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, Guillem Aromí ^A ^D

^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





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Australian Journal of Chemistry 62(9) 1130–1136 http://dx.doi.org/10.1071/CH09183
Submitted: 1 April 2009 Accepted: 25 April 2009 Published online: 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.