Formation of a solubilized cobalt block oligomer from a M2L-type double helicate.
Dalton Trans
; (39): 4722-9, 2006 Oct 21.
Article
em En
| MEDLINE
| ID: mdl-17028681
ABSTRACT
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.
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Base de dados:
MEDLINE
Assunto principal:
Polímeros
/
Cobalto
Idioma:
En
Revista:
Dalton Trans
Assunto da revista:
QUIMICA
Ano de publicação:
2006
Tipo de documento:
Article