Formation of a solubilized cobalt block oligomer from a M2L-type double helicate

The multi-dentate ligand, 2,3,5,6-tetrakis(2,2'-bipyridyl)pyrazine (L) and divalent cobalt self-assemble to a block co-polymer-like oligomer in solution, which contains at least the L(7)Co(8) fragment. The extent of oligomerization is sensitive to the water content in acetonitrile solution. In...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2006-10 (39), p.4722-4729
Main Authors: Heirtzler, Fenton, Santi, Saverio, Howland, Kevin, Weyhermüller, Thomas
Format: Article
Language:English
Subjects:
Binding Sites
Cobalt - chemistry
Crystallography, X-Ray
Molecular Conformation
Polymers - chemistry
Solubility
Water
Online Access:Get full text
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Summary:The multi-dentate ligand, 2,3,5,6-tetrakis(2,2'-bipyridyl)pyrazine (L) and divalent cobalt self-assemble to a block co-polymer-like oligomer in solution, which contains at least the L(7)Co(8) fragment. The extent of oligomerization is sensitive to the water content in acetonitrile solution. In the solid state, the simple monomer [LCo(2)(CH(3)CN)(4)][ClO(4)](4) is isolated. The X-ray structure of the crystallized material (containing four CH(3)CN solvate molecules) reveals a double-helical complex with two heptadentate Co(II) sites, and a helical pitch of approximately 28.1 A. Coupled Co(I/II) redox processes are observed between the two metal centres.
ISSN:1477-9226
DOI:10.1039/b605512e