Halogeno metallates of transition elements with cations of nitrogen-containing heterocyclic bases. VII - Two oxidation states and four different ironcoordinations in one compound. Synthesis, crystal structure, and spectroscopic characterization of 1,4-dimethylpiperazinium chloroferrate(II, III), (dmpipzH(2))(6)[(FeCl4)-Cl-II](2)[(FeCl4)-Cl-III](2)[(FeCl5)-Cl-II] [(FeCl6)-Cl-III]

The title compound being stable on air crystallizes from aqueous hydrochlor ic acid solutions in the trigonal space group R3 with a = 13,197(1), c = 38 ,405(6) Angstrom. Besides the cations in chair form, the structure contains six discrete, mononuclear chloroferrate anions arranged on a threefold axi s. Tetrahedral, octahedral, and, for the first time with iron(II), trigonal bipyramidal metal coordinations occur. Four sub-spectra contributing to th e Fe-57 Mossbauer spectrum can be distinguished and have been attributed to all four types of chloroferrate anions in the structure. The Raman spectro scopic investigation of orientated single crystals allows to recognize pola rized and non-polarized vibrations as well as to attribute all observed fre quencies.