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• W2059553218 abstract "Die high-spin-Cobalt(II)-Chelate 3 bilden mit Pyridin isolierbare Addukte, die ebenfalls zum high-spin-Typ gehören. Bei 3 b ist ESR-spektroskopisch ein low-spin-Addukt nachweisbar, das sich zeitabhängig in eine stabile quadratisch-pyramidale Form umwandelt. Mit 1,10-Phenanthrolin bildet 3 b ein low-spin-Monoaddukt. Die spektrophotometrische Titration von 3 d mit Pyridin zeigt ein Gleichgewicht A + 2 Py ⇌ APy2 an (β2 = 0,36 M−2), worin A vermutlich das Tetramere von 3 d ist. In Pyridin reagieren 3 a, 3 b und 3 d im Verhältnis 1:1, 3 c im Verhältnis 2:1 mit O2. ESR-spektroskopisch sind bei 3 a, 3 b und 3 d Superoxokomplexe nachweisbar. 3 b bildet mit O2 in Piperidin freies Superoxid und in n-Butylamin eine Spezies, deren ESR-Spektrum auf ein Ionenpaar mit direkter Wechselwirkung zwischen freiem O2− und koordiniertem Aminstickstoff hindeutet. Structure Reactivity Correlations in Coordinatively Unsaturated Chelate Complexes. IV. Reaction of Dioxygen with Cobalt(II) Chelates of Tridentate Di-anionic Schiff Base Ligands The high-spin cobalt(II) chelates 3 form with pyridine isolable adducts which are also high-spin complexes. In the case 3 b a low-spin mono-adduct is indicated by ESR spectroscopy, which is changed time-dependently into a stable quadratic-pyramidal form. With 1, 10-phenanthroline 3 b forms a low-spin mono-adduct. The spectrophotometric titration of 3 d with pyridine indicates an equilibrium A + 2 Py ⇌ APy2 (β2 = 0,36 M−2) where A represents probably the tetrameric form of 3 d. In pyridine, 3 a, 3 b, and 3 d react with O2 in an 1:1 ratio; 3 c binds O2 in the ratio 2:1. The formation of superoxo complexes is indicated by ESR spectroscopy for the complexes 3 a, 3 b, and 3 d. 3 b reacts with O2 in piperidine to give the free superoxide ion. In n-butylamine a species is formed which seems to be an ion pair with direct interactions between the free O2− ion and the coordinated amine nitrogen." @default.
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• W2059553218 date "1983-06-01" @default.
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• W2059553218 title "Struktur-Reaktivit�ts-Beziehungen bei koordinativ unges�ttigten Chelatkomplexen. IV. Zur Reaktion von Sauerstoff mit Cobalt(II)-Chelaten dreiz�hniger, dianionischer Schiffscher Basen" @default.
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• W2059553218 doi "https://doi.org/10.1002/zaac.19835010605" @default.
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