title: Transition metal ion complexes with associates of porphyrin bound to a hydrophobic-hydrophilic copolymer.
abstract: The interaction of dimeric forms of meso-tetraphenylporphine with Mn2+ as well as the interaction of associated forms of meso-tetra(p-aminophenyl)porphine bound to a hydrophobic-hydrophilic copolymer with Mn2+ and Fe3+ were studied by absorption, luminescence, Raman, and EPR spectroscopies. Both dimeric and associated forms of these porphyrins produced Mn2+ complexes. Manganese ions in these complexes undergo clusterization, which is accompanied by transformation of the six-line EPR signal of Mn2+ into a broad single-line signal. The EPR signal of Mn2+ in these clusters is characterized by a g-factor value typical of a free electron with half-width DeltaHpp = 50 mT. The interaction of the two-component complex with Fe3+ produces a donor-acceptor complex. The electronic spectrum of the donor-acceptor complex contains a broad band with a maximum at 760 nm. The molar extinction coefficient of the complex at 760 nm is 9.1.104 M-1.cm-1, and the rate constant for its formation is Kdac = (3.9 +/- 0.6).106 M-1. The constants for Mn2+ binding to the organic compounds used in this work were also determined.
authors.affiliation: School of Biology, Lomonosov Moscow State University, Moscow, 119899, Russia. avu@audaltsov.home.bio.msu.ru
authors.forename: A V
authors.initials: AV
authors.lastname: Udal'tsov
authors.forename: A A
authors.initials: AA
authors.lastname: Churin
authors.forename: K N
authors.initials: KN
authors.lastname: Timofeev
authors.forename: Y V
authors.initials: YV
authors.lastname: Kovalev
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D011108:Polymers; D011166:Porphyrins / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D005290:Ferric Compounds; D011108:Polymers; D011166:Porphyrins; D008345:Manganese