Extraktion von Mangan(II) mit Thenoyltrifluoraceton (TTA)

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Komplexe von Kupfer(I) mit Glyoxal-bis-N-t.-butylimin

Formation of strongly colored complexes of Cu⁺ with glyoxal-bis-(N-t-butylimin) (GLI) is observed in acetonitrile. Optical measurements reveal two complexes, Cu(GLI)⁺ (?_max = 26.0 kK, δ = 2800) and Cu(GLI) (?_max = 19.3 kK, ε = 8530). The equilibrium constants (0.1M tetraethylammoniumperchlorate) are logK₁ = 3.9 and logK₂ = 2.5. The equilibrium data are confirmed by potentiometric measurements with a copper electrode. In O-donor solvents, only the 1:2 complex is observed. Cu(GLI)₂CIO₄ can be crystallized as a dark red solid which is stable towards atmospheric oxygen.     

Die Oxydation von Mangan(II)- und Chrom (III) -ionen mit Silber(II)-oxid

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Verbesserung der Endpunktsanzeige bei der komplexometrischen Bestimmung von Eisen(III) mit biamperometrischer Indikation durch Zusatz von Mangan(II)

Zusammenfassung Bei der komplexometrischen Eisen(III)-bestimmung mit biampero-metrischer Indikation kann die Schärfe des Endpunktes durch Zusatz von Mangan wesentlich verbessert und eine direkte Ablesung ermöglicht werden.

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Summary In the chelatometric determination of iron(III) with biamperometric indication the sharpness of the end point can be considerably improved by addition of manganese(II) and a direct reading without graphical evaluation is made possible.

     

Die amperometrische Titration von Mangan(II) mit Natriumhexacyanoferrat (II)

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Ternäre Komplexe von Eisen(III) mit Ethylendiamintetraessigsäure und Monophenolderivaten

Ternary Complexes of Iron(III) with Ethylene Diamine Tetraacetic Acid and Derivatives of Monophenols Ternary complexes of iron(III) are investigated with ethylenediamine tetraacetic acid and some monophenols in solution as well as their reactions of formation have been controlled by spectrophotometric and elektrophoretic methods. The ratio of components in the compounds Fe: Y: L is 1: 1: 1 without any exception. The measured optical properties (λ_max' ?_max) of the complexes are discussed.     

Zur Identifizierung der Komplexe von Phenobarbital (Ph) mit Chinin (I), Chinidin (II) und Hydrochinidin (III)

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Über Oxidhydroxide des vierwertigen Mangans mit Schichtengitter. 3. Mitteilung. Reduktion von Mangan(III)-manganat(IV) mit Zimtalkohol

Manganese(III) manganate(IV), one of the synthetic varieties of the birnessite group, is readily reduced in xylene suspension by cinnamyl alcohol. At moderate temperatures, including room temperature, γ-MnOOH (manganite) forms topotactically in extremely thin needles and is therefore easily overlooked in the X-ray examination. At higher temperatures further reduction occurs (Mn^III → Mn^II), and Mn₃O₄ (hausmannite) appears in comparatively large, equant cristallites which are less distinctly oriented. For comparison Na₄Mn₁₄O₂₇, 9H₂O, which has also been investigated, is much more stable than Mn₇O₁₃, 5H₂O. The same holds for finely divided synthetic varieties of the birnessite group precipitated from KMnO₄ solutions; by their behaviour they are related to Na₄Mn₁₄O₂₇, 9H₂O rather than to Mn₇O₁₃, 5 H₂O which is consistent with their substantial alkaline ion content. These results raise the question: is the so-called ‘todorokite’ a pure crystal species. According to present data ‘todorokite’ could be regarded as a transition product, i.e. as half decomposed buserite admixed with birnessite and substantial amounts of manganite.     

Die Bestimmung von Cer(IV), Mangan(VII) und Eisen(III)

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Nachweis von Chrom(III) mit m-Nitrobenzamidoxim

Zusammenfassung Dreiwertiges Chrom bildet mit m-Nitrobenzamidoxim in alkalischer Lösung einen violettgefärbten Komplex. Dieser wurde mit i-Amylalkohol extrahiert und ist für den Nachweis kleiner Chrommengen geeignet. Die Erfassungsgrenze ist 6g/ml und die Grenzverdünnung 1167000. Störende Ionen sind Co²⁺, Cd²⁺ und Ni²⁺. Die Zusammensetzung des Komplexes entspricht der Formel [Cr(I)₃]. Die Komplexbildungskonstante ist logK = 6,65 ± 0,04 bei einer Ionenstärke=0,2.

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Detection of chromium(III) with m-nitrobenzamidoxime

Summary Tervalent chromium in alkaline solution yields a violet complex withm-nitrobenzamidoxime. This complex is extracted intoi-amyl alcohol and is suitable for the detection of small amounts of chromium. The detection limit is 6g/ml and the dilution limit is 1 167000. Among the interfering ions are Co²⁺, Cd²⁺, and Ni²⁺. The composition of the complex corresponds to the formula [Cr(I)₃]. The formation constant of this complex is logK=6.65±0.04 at an ionic strength=0.2.

     

Das polarographische Verhalten von Mangan(III) in alkalischen Tartratl?sungen

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Mangan(IV)-Komplexe mit dreizähnigen diaciden Liganden. Kristallstruktur von Acetylacetonato-salicylaldehydbenzoylhydrazonato(2−)-methanol-mangan(III)

Manganese(IV) Complexes with Tridentate Diacidic Ligands. Crystal Structure of Acetyl-acetonato-salicylaldehydebenzoylhydrazonato(2?)-methanol-manganese(III) The manganese(IV) chelates of salicylaldehyde benzoylhydrazone and salicylaldehyde salicylhydrazone were synthesized by ligand exchange reactions using bis(acetylacetonato)manganese(II), tris(acetylacetonato)manganese(III) as well as manganese(III) acetate. The brown complexes show the expected molecular ions in the APCI mass spectra. As an intermediate compound acetyacetonato-salicylaldehydebenzoylhydrazonato(2?)-methanol-manganese(III) was isolated and characterized by X-ray structural analysis. Crystallographic data see “Inhaltsübersicht”.     

Die Komplexe von Dioxocyan (OCN)2 mit TiCl4 und ZrCl4

Complexes of Dioxocyanogen (OCN)₂ with TiCl₄ and ZrCl₄ A solution of (OCN)₂ was obtained by reaction of AgOCN with Br₂ in H₂CCl₂ at ?70°C. From this the complexes TiCl₄(NCO)₂ and ZrCl₄(NCO)₂ were obtained by addition of equimolar amounts of TiCl₄ and ZrCl₄, respectively. According to the i.r. and Raman spectra, the (NCO)₂ ligand is bonded via its N atoms to the metal.     

Den Nachweis von Mangan(II)

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