Synthesis, characterization and cation-induced dimerization of new aza-crown ether-appended metalloporphyrinsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:New metalloporphyrins bearing one or two aryl-aza-crown ether moieties at meso- positions have been synthesized using 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 1H NMR spectroscopic studies showed that addition of K+ cations to solution of monomeric aza-crowned porphyrins in CHCl3/MeOH led to cation-induced dimerization of these porphyrins, whereas addition of Na+ cations yielded monomeric complex. Axial coordination of 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.