Synthesis and Characterization of the Cobalt Complexes of New BF2 + Bridged, Anthracene Substituted Bis(a-Dioxime) Macrocycles

Autor:	Piotr J. Chmielewski, Neil A. Stephenson, Ahmad S. Abusamleh, Daryle H. Busch, Luis Morales, P. Richard Warburton
Rok vydání:	1991
Předmět:	chemistry.chemical_classification Stereochemistry Ligand Coordination number chemistry.chemical_element Crystal structure Adduct chemistry.chemical_compound Crystallography Polycyclic compound chemistry Pyridine Materials Chemistry Physical and Theoretical Chemistry Cobalt Cyclophane
Zdroj:	Journal of Coordination Chemistry. 23:91-111
ISSN:	1029-0389 0095-8972
DOI:	10.1080/00958979109408245
Popis:	The synthesis, characterization and structure are described for new cobalt complexes, with a BF2 + bridged, bis(a-dioxime) ligand, based upon a sterically demanding framework derived from an anthracene Diels-Alder adduct. The ligand provides a deep cleft within which axial ligands and/or O2 can bind. The crystal structures of the bis- and mono(BF2 +) bridged complexes have space groups P21/c and P I, respectively, with unit cell dimensions a = 12.662(2) A, b = 16.430(3) A, c = 10.438(3) A, β = 103.51(2)°, a = 12.046(1)A, b = I7.596(3)A, c = 9.939(I)A, a = 105.15(1)°, β = 102.87(1)°, and γ = 78.13(1), respectively. For both complexes Z = 2 and the residuals R and R w were 0.070, 0.104, and 0.059, 0.075, respectively. ESR studies show that the cobalt(II) complexes have a strong tendency to bind two axial nitrogen bases, adopting a coordination number of six. The dioxygen affinity of the new cobalt(II) dioxygen carrier is limited by the competition between axial base binding and O2 binding. This ext...
Databáze:	OpenAIRE
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