title: Synthesis, characterization and cation-induced dimerization of new aza-crown ether-appended metalloporphyrins.
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.
authors.affiliation: A.N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninskiy prospect 31-4, 119071, Moscow, Russia.
authors.forename: Elena A
authors.initials: EA
authors.lastname: Mikhalitsyna
authors.forename: Vladimir S
authors.initials: VS
authors.lastname: Tyurin
authors.forename: Ilia A
authors.initials: IA
authors.lastname: Zamylatskov
authors.forename: Victor N
authors.initials: VN
authors.lastname: Khrustalev
authors.forename: Irina P
authors.initials: IP
authors.lastname: Beletskaya