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- W1970783974 abstract "Aus wässerig-salzsauren Lösungen äquimolarer Mengen von 1,4-Dimethylpiperazin und FeCl2 · 4 H2O kristallisiert infolge Oxidation durch Luftsauerstoff die gemischtvalente Titelverbindung in der trigonalen Raumgruppe R3 mit a = 13,197(1), c = 38,405(6) Å. Außer den Kationen in Sesselform enthält die Struktur sechs diskrete, einkernige Chloroferrat-Anionen in den Oxidationsstufen +2 und +3, wobei neben tetraedrischer und oktaedrischer Koordination erstmalig trigonal-bipyramidale Koordination für Fe(II) auftritt. Im 57Fe Mössbauer-Spektrum lassen sich vier Subspektren in Form von Lorentz-Linien separieren, die allen vier Koordinationstypen zugeordnet werden können. Mittels Raman-spektroskopischer Untersuchung orientierter Einkristalle konnten polarisierte und nichtpolariserte Schwingungen unterschieden sowie die beobachteten Schwingungsfrequenzen zugeordnet werden. Halogeno Metallates of Transition Elements with Cations of Nitrogen-containing Heterocyclic Bases. VII Two Oxidation States and Four Different Iron Coordinations in one Compound. Synthesis, Crystal Structure, and Spectroscopic Characterization of 1,4-Dimethylpiperazinium Chloroferrate(II, III), (dmpipzH2)6[FeIICl4]2[FeIIICl4]2[FeIICl5] [FeIIICl6] The title compound being stable on air crystallizes from aqueous hydrochloric acid solutions in the trigonal space group R3 with a = 13,197(1), c = 38,405(6) Å. Besides the cations in chair form, the structure contains six discrete, mononuclear chloroferrate anions arranged on a threefold axis. Tetrahedral, octahedral, and, for the first time with iron(II), trigonal bipyramidal metal coordinations occur. Four sub-spectra contributing to the 57Fe Mössbauer spectrum can be distinguished and have been attributed to all four types of chloroferrate anions in the structure. The Raman spectroscopic investigation of orientated single crystals allows to recognize polarized and non-polarized vibrations as well as to attribute all observed frequencies." @default.
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- W1970783974 date "1999-01-01" @default.
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- W1970783974 title "VII Zwei Oxidationsstufen und vier verschiedene Koordinationen von Eisen in einer Verbindung. Synthese, Kristallstruktur und spektroskopische Charakterisierung von 1,4-Dimethylpiperazinium-Chloroferrat(II, III), (dmpipzH<sub>2</sub>)<sub>6</sub>[Fe<sup>II</sup>Cl<sub>4</sub>]<sub>2</sub>[Fe<sup>III</sup>Cl<sub>4</sub>]<sub>2</sub>[Fe<sup>II</sup>Cl<sub>5</sub>] [Fe<sup>III</sup>Cl<sub>6</sub>]" @default.
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