Additionsverbindungen zwischen Antimon(III)-Halogeniden und 1,4-Dithiacycloheptan

Addition Compounds between Antimony(III)-Halides and 1,4-Dithiacycloheptane SbCl₃, SbBr₃, and SbI₃ do form the addition compounds SbCl₃ · 1,4-Dithiacycloheptane, SbBr₃ · 1,4-Dithiaheptane and 2 SbI₃ · 1,4-Dithiacycloheptane from benzene solutions. The new compounds are only stable in the solid form. FIR spectra of the SbCl₃ and SbBr₃ complexes are recorded as well as the X-ray structure of the SbCl₃ compound.     

Kinetik und Mechanismus des Ligandentausches zwischen Thallium(III)oxinat und Eisen(III) in Propylencarbonat

The transfer of oxinate ions from thallium (III)oxinate to trivalent Fe(DMF) ₆ ³⁺ in propylenecarbonate takes place via rearrangements within a rapidly formed binuclear thallium(III)—iron(III) complex. In a last rapid step this rearranged complex reacts with excess reactants to the final products whose composition accordingly depends on the ratio of the reactant concentrations.

     

Beitrag zur Reaktion zwischen Nickel(II)-oxid und Eisen(III)-oxid zu molarem Nickelferrit

By several methods of measurements (saturation magnetization, paramagnetic susceptibility, specific surface, specific catalytic activity, Debye-Scherrer-diagrams) the formation of molar nickel ferrite, NiFe₂O₄, by the reaction NiO + Fe₂O₃ = NiFe₂O₄ was studied. Comparing these methods some problems of the process of ferrite formation, f. i. the relation between the energy quantity needed for ferrite formation and the output of the endproduct, should be explained. Both, kinetic and thermodynamical calculations were made and their results are discussed in connection with the literature.     

Komplexe zwischen Eisen(II)- und Tartrat-Ion

The formation of complexes between iron(II) and tartrate ion (L) has been studied at 25° C in 1m-NaClO₄, by using a glass electrode. The e.m.f. data are explained with the following equilibria: $$\begin{gathered} Fe^{2 + } + L \rightleftarrows FeL log \beta _1 = 1,43 \pm 0,05 \hfill \\ Fe^{2 + } + 2L \rightleftarrows FeL_2 log \beta _2 = 2,50 \pm 0,05 \hfill \\\end{gathered} $$ The protonation constants of the tartaric acid have been determinated: $$\begin{gathered} H^ + + L \rightleftarrows HL logk_1 = 3,84 \pm 0,03 \hfill \\ 2H^ + + L \rightleftarrows H_2 L logk_2 = 6,43 \pm 0,02 \hfill \\\end{gathered}$$ .     

Die Kinetik der Reaktion zwischen Iridium(III) und Chlorat

Ohne Zusammenfassung     

Beziehungen zwischen Lumineszenzspektrum und Struktur von Seltenerdkomplexen. II. Oktaedrisch koordinierte Hexahalogenokomplexe des Europium(III)

The analysis of the luminescence spectra of the pyridinium hexahalogeno complexes of europium(III) (PyH)₃EuCl₆ and (PyH)₃EuBr₆ is in accordance with the presence of a weakly distorted octahedral symmetry at the rare earth site. The parameters calculated from the splitting of the ⁷F₂-level, \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm B}_{{\rm 40}} {\rm (EuCl}_{\rm 6} {\rm - - -) = 159 \pm 4 und B}_{{\rm 40}} {\rm (EuBr}_{\rm 6} {\rm - - -) = 152 \pm 4 cm}^{- {\rm 1}} {\rm,} $\end{document} are about four to five times larger than the parameters calculated theoretically from the electrostatic point-charge model.     

Zur Kinetik der Reaktion zwischen Thioharnstoff und Eisen(III)-Ionen

Kinetics have been investigated in the presence of excess thiourea. The existence of two intermediate complexes has been established; the results can be interpreted on the assumption of interaction of the thiourea molecules with these complexes.

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Mit 4 Abbildungen     

Beziehungen zwischen chemischer Verschiebung (19F und 13C) und Ladungsdichte: III

The diamagnetic and paramagnetic terms of the chemical shift are expressed by semi-empirical CNDO/II charge densities and bond orders. To establish whether a linear functional relationship exists between the calculated terms and the chemical shifts of ¹⁹F and ¹³C atoms a number of relationships in the form of a linear regression have been examined, taking into consideration both s?_dia and s?_dia plus s?_para. It was found that the relationship δ_A = a + bq_A + cQ_AB + dq_A^πQ_AB produces the smallest standard deviation.     

Sulfonazo (I) und sein Dibrom (II)- und Dimethylderivat (III)

Ohne Zusammenfassung     

Schiff-Basen aus 1,3-Dicarbonylverbindungen und Triaminen und ihre Fe (III)-, Co (III)-, Ni(II)- und Cu(II)-Komplexe

Schiff bases of 1,3-dicarbonyl compounds with triamines and their Fe(III), Co(III), Ni(II) and Cu(II) complexes The preparation of new hexadentate ligands obtained by the reaction of cis, cis-1,3,5-triaminocyclohexane (tach) or 1,1,1-tris (aminomethyl)ethane (tame) with an 2-ethoxymethylidene-1,3-dicarbonyl compound as well as their Fe(III), Co(III), Ni(II) and Cu(II) complexes is reported. Fe(III) and Co(III) yield neutral complexes with an octahedral N₃O₃-coordination sphere, Ni(II) and Cu(II) complexes with a square-planar coordination-sphere. In the later complexes one of the bidentate branches of the ligand is not deprotonated and stays uncoordinated.     

Zur Trennung von Kupfer (II) und Eisen (III)

Ohne Zusammenfassung     

Die Farbreaktion zwischen 4-Aminophenazon und Phenolen in Gegenwart von Kaliumhexacyanoferrat(III)

Ohne Zusammenfassung     

Die oxidimetrische Titration von Zinn(II),Arsen(III) und Antimon(III)

Ohne Zusammenfassung     

Quantitative Bestimmung von Hexacyanoferrat(II, III) und Hexacyanocobaltat-(III) in Gemischen

Ohne Zusammenfassung     

Quantitative Bestimmung von Hexacyanoferrat(II,III) und Hexacyanocobaltat-(III) in Gemischen

Analytical and Bioanalytical Chemistry -     

Zur quantitativen Trennung von Eisen(II) und Eisen(III)

Ohne Zusammenfassung     

Anionenaustausch-Trennungen von Eisen (II) und Eisen (III) in Tartratmedium

Ohne Zusammenfassung