1. Synthesis, characterization and cation-induced dimerization of new aza-crown ether-appended metalloporphyrins
- Author
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Irina P. Beletskaya, Ilia A. Zamylatskov, Vladimir S. Tyurin, Elena A. Mikhalitsyna, and Victor N. Khrustalev
- Subjects
chemistry.chemical_classification ,Ligand ,Metal ions in aqueous solution ,chemistry.chemical_element ,Ether ,DABCO ,Zinc ,Photochemistry ,Inorganic Chemistry ,stomatognathic diseases ,chemistry.chemical_compound ,chemistry ,Polymer chemistry ,heterocyclic compounds ,Amination ,Crown ether ,Palladium - Abstract
New metalloporphyrins bearing one or two aryl-aza-crown ether moieties at meso-positions have been synthesized using a palladium catalyzed amination reaction and fully characterized by spectral techniques. X-Ray structural data have been presented for the zinc and copper complexes of mono-substituted aza-crown ether appended metalloporphyrins. UV-Vis and (1)H NMR spectroscopic studies showed that addition of K(+) cations to a solution of monomeric aza-crowned porphyrins in CHCl(3)/MeOH led to cation-induced dimerization of these porphyrins, whereas addition of Na(+) cations yielded a monomeric complex. Axial coordination of the exobidentate ligand (DABCO) to zinc complexes of aza-crowned porphyrins and following binding metal ions led to formation of sandwich complexes with high stability constants.
- Published
- 2012
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