Das neue ternäre Borid Mg8Pt4B und die neue intermetallische Verbindung PtMg2

The New Ternary Boride Mg₈Pt₄B and the New Intermetallic Compound PtMg₂ The new magnesium platinum boride Mg₈Pt₄B was obtained from a reaction of the elements in sealed niobium tubes. It crystallizes isotypically with Mg₈Rh₄B in the cubic space group with a =12.2481(1) Å and can be structurally derived from the Ti₂Ni structure type, where boron occupies cavities, which are formed by four magnesium and four platium atoms. The new intermetallic compound PtMg₂ was also prepared by reaction of the elements in a sealed Nb container and adopts the tetragonal CuAl₂ type structure, space group I4/mcm with a = 6.334(1) Å and c = 5.621(1) Å.     

Über ternäre Thalliumchalkogenide mit Thalliumselenidstruktur

On Ternary Thallium Chalcogenides with Thallium Selenide Structure. By means of single crystal investigations, it has been confirmed that the compounds TlGaTe₂, TIInSe₂, and TIInTe₂ crystallize in the TISe type (B37). As an univalent cation thallium is surrounded by eight chalcogen atoms. Gallium and indium are trivalent with tetrahedral coordination and covalent bonds. The interatomic distances as well as coordination and bonding resulting from them are discussed.     

Neue ternäre Phasen von Platinmetallen mit Lithium und Elementen der 4. Hauptgruppe

Novel Ternary Phases of Platinum Metals with Lithium and Main Group IV Elements The elements palladium, platinum, and iridium (Me) form ternary compounds with lithium and the elements germanium, tin or lead (X) of the formulas Li₂MeX and/or LiMe₂X. The lattice constants of the cubic fc. crystallizing compounds see ?Inhaltsübersicht”?. Besides the cubic form of LiPd₂Ge there exists a tetragonal structure with a = 6.25₄ and c = 6.41₀ Å. X-ray investigations on single crystals showed that LiPd₂Ge crystallizes in a Heusler lattice (L2₁A type), Li₂PdSn has a modified Li₃Bi structure (L2₁C type). The homogeneity range between the compositions Li₂PdX and LiPd₂X was investigated.     

Neue ternäre Kupferpnictide mit modifizierten BaAl4-Strukturen

New Ternary Copper Pnictides with Modified BaAl₄ Type Structures EuCu₂As₂ (a = 4.215(1) Å, c = 10.185(2) Å) and EuCu₂Sb₂ (a = 4.504(1) Å, c = 10.824(2) Å) were prepared by heating (900°C) mixtures of CuCl and arsenic (antimony) with europium. The by-products were dissolved by dilute acetic acid. The arsenide crystallizes in the ThCr₂Si₂ type structure (I4/mmm; Z = 2) with holes in the copper arrangement, whereas the antimonide forms the CaBe₂Ge₂ type structure (P4/nmm; Z = 2). The stability ranges of both phases were determined by mixed crystal formation in accordance with EuCu₂As_2–xSb_x. Magnetic measurements showed, that Europium is divalent and that the compounds order magnetically at low temperatures. BaCu₂Sb₂ (I4/mmm; a = 4.655(1) Å, c = 32.709(6) Å; Z = 6) was prepared by heating a mixture of binary antimonides of barium and copper in a melt of NaCl/KCl. The structure of this compound consists building elements of the CaBe₂Ge₂ and the ThCr₂Si₂ type structure. The already known compounds SrCu₂As₂ and BaCu₂As₂ were produced in a homogeneous form for the first time and their structures (ThCr₂Si₂ type) redetermined by means of single crystal X-ray methods.     

Neue ternäre Verbindungen des Caesiums mit Elementen der 8. Nebengruppe und 5. Hauptgruppe

New Ternary Compounds of Cesium and Elements of the 8^th Transition Metal Group and the 5^th Main Group In the ternary systems Cesium/element of the 8^th transition metal group/element of the 5^th main group some new compounds were found and investigated. Compounds of the formula Cs₂MX₂ (M = Pt, Pd, Ni; X = P, Sb, Bi) can be placed in a line with the K₂PdP₂-type structure. The new compound with the formula CsFe₂Sb₂ crystallizes in the ThCr₂Si₂-type structure. By single crystal measurements CsFe₂As₂ was found to crystallize in the space group I4/mmm with the lattice constants a = 389.43 pm and c = 1 509.97 pm.     

Neue gemischtvalente ternäre Bromide und Iodide mit Dysprosium und Thulium vom Typ A5M3X12

New Mixed‐Valence Ternary Bromides and Iodides of Dysprosium and Thulium of the Type A₅M₃X₁₂ The new ternary mixed‐valence bromides and iodides of dysprosium and thulium Rb₅Dy₃Br₁₂, Rb₅Tm₃Br₁₂, K₅Dy₃I₁₂, K₅Tm₃I₁₂, Rb₅Dy₃I₁₂ and Rb₅Tm₃I₁₂ were obtained by metallothermic reduction of DyBr₃, TmBr₃, DyI₃ and TmI₃, respectively, with potassium and rubidium in the presence of the respective alkali metal halides in sealed niobium containers. The crystal structure was determined for the example of K₅Dy₃I₁₂ (hexagonal, P 6 2m, Z = 1; a = 1446.7(2), c = 473.3(1) pm): DyI₆ octahedra are connected via common trans edges to chains. Magnetic measurements on X‐ray pure samples show Curie‐Weiss behaviour at sufficiently high temperatures. Antiferromagnetic coupling occurs at low temperatures.     

Neue ternäre Phosphide und Arsenide des Caesiums mit Elementen der 8. Nebengruppe

New Ternary Phosphides and Arsenides of Cesium and Element of the 8th Transition Metal Group In the ternary systems Cesium/8^th transition metal group/5^th main group some new compounds were found and investigated. By single crystal measurements CsRh₂P₂ was found to crystallize in the space group 14/mmm with the lattice constants a = 390.11 pm and c = 1429.36 pm. The new compounds with the formula CsM₂X₂ (M = Fe, Co, Ru, Rh, Ir; X = P or As) crystallize in the ThCr₂Si₂-type structure, compounds of the formula Cs₂MX₂ (M = Ni, Pd, Pt; X = P or As) can be placed in a line with the K₂PdP₂-type structure.     

Ag5GeO4, das erste subvalente ternäre Silberoxid

Ag₅GeO₄, the First Subvalent Ternary Silver Oxide Applying high oxygen pressure the first subvalent ternary silver oxide Ag₅GeO₄ was obtained (for crystallographic data c.f. “Inhaltsübersicht”). Ag₅GeO₄ contains tetrahedral GeO₄^4?-ions besides [Ag₆]⁴⁺ clusters, which have not been observed in ternary silver oxides, so far. The electrical and magnetical properties prove the localisation of two paired electrons in each silver octahedron. The thermal decomposition occurs in two steps at 432.7 °C and 524.5°C.     

Neue ternäre Germanide des Lithiums mit Lanthanoiden im Fe2P-Typ: LiErGe,LiHoGe, LiNdGe und LiSmGe

Ternary Germanides of Lithium and Rare-Earth-Metals with Fe₂P-Type Structure: LiErGe, LiHoGe, LiNdGe and LiSmGe In the systems Li? M? Ge (M ? Er, Ho, Nd, Sm) the compounds LiErGe, LiHoGe, LiNdGe and LiSmGe were prepared. They crystallize hexagonally (space group P-6 2m), and a C22-(Fe₂P-type) lattice was found. The crystal structure of LiErGe was determined by X-ray single crystal investigation. Structural features of the compounds are discussed in comparison.     

IR-Spektren und Kraftfelder ternärer Alkali-Yttriumfluoride mit Elpasolitstruktur

IR Spectra and Forcefields of Ternary Alkali–Yttrium Fluorides with Elpasolite Structure IR spectra of A₂BYF₆ are reported and five force constants are calculated using a modified valence force field. The results are discussed with respect to the two bond characters.     

Neue ternäre Arsenide des Caesiums mit Elementen der 8. Nebengruppe

New Ternary Arsenides of Cesium with 8b-Elements Cs₂PdAs₂ was prepared from the elements. It is isotypic with K₂PdAs₂ (A₂MX₂) and crystallizes orthorhombically, space group Cmcm, with the following constants: a = 706.8(4) pm; b = 1476.6(7) pm; c = 636.6(3) pm. The structure is characterized by MX₂-zigzag-ribbons surrounded by channel-like arranged alkali atoms. The new ternary compounds CsRu₂As₂ and CsRh₂As₂ are isotypic with ThCr₂Si₂ (inferred from powder photographs).     

Kristallstrukturen und spektroskopische Untersuchungen ternärer CuII-Komplexe mit bicyclischen Dicarbonsäuren und N,N-Donor-Liganden

Crystal Structures and Spectroscopic Investigations of Ternary Cu^II-Complexes with Bicyclic Dicarboxylic Acids and N,N-Donor Ligands The synthesis of coordination compounds [CuLdam] · 3H₂O (H₂L = 7-oxa-bicyclo[2.2.1]heptane-2-exo,3-cis-dicarboxylic acid ( 1 ) and its 1-methyl-derivative ( 2 ); dam = ethylendiamine, 1,2- and 1,3-propylendiamine, 2,2′-dipyridyl, 1,10-phenanthroline) has been described. Results of visible and IR spectroscopy and magnetic data are given. In the result of X-ray analyses of [CuL¹dipy] · 3H₂O ( 1 d ) and [CuL²en] · 3H₂O ( 2 a ) the dicarboxylate anions of 1 and 2 proved to be tridentate chelating ligands. In 1 d the Cu atom has an approximately square-pyramidal coordination with the bridging O atom in the apical position. In 2 a , however, the coordination number is extended to six by an O atom of a second [CuL²en] unit resulting in a centrosymmetric complex dimer with octahedrally coordinated Cu atoms. The water molecules do not participate in the coordination of the Cu atoms and form a complicated system of hydrogen bonds in the crystal.     

Neue ternäre KäfigVerbindungen in den Systemen Barium–2B(3B)-Element-Germanium

New Ternary Clathrate Compounds in the Systems Barium–2B(3B)-Elements–Germanium In the ternary systems Barium–2B(3B) elements–germanium new ternary variants of the K₈Ge₄₆ clathrate structure and hints to clathrates of another composition have been found. Results of structure determination of Ba₈Cd₈Ge₃₈ (cubic, a = 1096.2 pm; space group Pm3n) show a prevailing ordered distribution of Cd and Ge in the sites of the structure building atoms. According to electron balance Ba₈Cd₈Ge₃₈ can be assumed to be a ternary Zintl compound.     

Ternäre Bromide mit Lithium und Silber: RbLiBr2, CsLiBr2 und CsAgBr2

Ternary Lithium and Silver Bromides: RbLiBr₂, CsLiBr₂, and CsAgBr₂ RbLiBr₂, CsLiBr₂, and CsAgBr₂ are obtained by reactions of the corresponding binary bromides. X-ray powder patterns and a single-crystal study of RbLiBr₂ show that the bromides are isotypic with the corresponding chlorides. The (formal) relationship of the crystal structures of RbLiBr₂ and CsAgBr₂ is described.     

Neue ternäre Rhodium‐ und Iridium‐Phosphide und ‐Arsenide mit U4Re7Si6‐Struktur

New Ternary Rhodium‐ and Iridium‐Phosphides and ‐Arsenides with U₄Re₇Si₆ Type Structure Single crystals of Mg₄Rh₇P₆ (a = 7.841(1) Å), Mg₄Rh₇As₆ (a = 8.066(1) Å), Yb₄Rh₇As₆ (a = 8.254(1) Å) and Mg₄Ir₇As₆ (a = 8.082(2) Å) were prepared by heating mixtures of the elements in a lead flux and were investigated by means of X‐ray methods. The compounds are isotypic and they crystallize in the U₄Re₇Si₆ type structure (Im 3 m; Z = 2), which is formed by CeMg₂Si₂ analogous units, which are twisted against each other. The Rh(Ir) atoms building these units are coordinated tetrahedrally by the non‐metal. The P(As) atoms of six units form a regular octahedron, which is centred by an additional Rh(Ir) atom. This second structural segment corresponds to the perovskit type structure.