DABCO‐Directed Self‐Assembly of Bisporphyrins (DABCO=1,4‐Diazabicyclo[2.2.2]octane)
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説明
<jats:title>Abstract</jats:title><jats:p>Three isomeric zinc bisporphyrins have been prepared by covalently linking together two aminoporphyrins with an isophthalic acid derivative. The porphyrins differ in the substitution pattern on the <jats:italic>meso</jats:italic> phenyl groups, that is, <jats:italic>ortho</jats:italic>, <jats:italic>meta</jats:italic>, or <jats:italic>para</jats:italic>. Titrations carried out by UV‐visible and <jats:sup>1</jats:sup>H NMR spectroscopy have been used to map out the stabilities and the stoichiometries of the complexes formed with 1,4‐diazabicyclo[2.2.2]octane (DABCO) in chloroform. The <jats:italic>ortho‐</jats:italic> and <jats:italic>meta‐</jats:italic>substituted bisporphyrins form 1:1 intramolecular sandwich complexes. The <jats:italic>para‐</jats:italic>substituted bisporphyrin cannot adopt the cofacial conformation required for this type of complex and forms a higher order 2:2 intermolecular assembly, which is stable over a wide range of DABCO concentrations.</jats:p>
収録刊行物
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- Chemistry – A European Journal
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Chemistry – A European Journal 11 (7), 2196-2206, 2005-03-09
Wiley