No abstract

3M Alloys and Porous Metal-Rich Tellurides.-The novel title zirconium chalcogenides are prepared by arc melting reactions. According to the single crystal XRD data Zr6FeTe2 adopts the hexagonal space group P62m with Z = 1, whereas both Zr6Fe0.6Se2.4 and Zr6Fe0.57S2.43 crystallize in the orthorhombic space group Pnnm with Z = 4 of the Ta2P structure type. The tellurides are isotypic with Zr6CoAl2. The structural differences are attributed to different sizes of chalcogens and the different modes of crosslinking of common building blocks comprising M-centered tetrakaidecahedra of Zr which are regular in Zr6FeTe2 but appreciably distorted in the nonstoichiometric chalcogenides. The role of polar Zr-Fe bonding for the stabilization of Zr6FeSe2 and Zr6FeTe2 compounds is underscored by the results of electronic band structure calculations. -(WANG, C.; HUGHBANKS, T.; Inorg. Chem. 35 (1996) 24, 6987-6994; Dep. Chem., Tex. A&M Univ., College Station, TX 77843, USA; EN)

structure structure (solids and liquids) D 2000 -011New Layered Zirconium Tellurides: Zr 0.30 ZrTe 2 (I), Zr 0.29 Zr 2 Te 2 As (II), and NaZr 2 Te 2 As (III).-The new layered title tellurides are synthesized and characterized by X-ray and electrical resistivity measurements. Zirconium telluride (I) crystallizes in the hexagonal space group P6 3 mc (Z = 2) and displays close structural similarities to Zr 2 Se 3 . The structure of the ternary telluride (II) is refined in the rhombohedral space group Rr3rm (Z = 3) and resembles that of Ta 2 Te 2 As. Both tellurides (I) and (II) exhibit structures wherein Zr atoms are included between layers by partially filling trigonal antiprismatic holes. The quarternary telluride (III) proves to be isostructural to telluride (II). It is suggested that the [Zr 2 Te 2 As] layered compounds may offer new opportunities as electron-donating hosts. -(WANG, C.; EYLEM, C.; HUGHBANKS, T.; Inorg. Chem. 37 (1998) 3, 390-397; Dep. Chem., Tex. A&M Univ., College Station, TX 77843, USA; EN)

structure structure (solids and liquids) D 2000 -019Synthesis and Structures of New Layered Ternary Manganese Tellurides: AMnTe 2 (A: Li, Na). -The Na compound is prepared indirectly from the quaternary Na-Mn-Zr-Te mixture, whereas the Li compound is synthesized from the elements. Both structures are determined by single crystal XRD (space group P3m1, Z = 1). Magnetic susceptibility measurements show nearly temp.-independent paramagnetism. The effective magnetic moments (µ ef f ) are ¡ 4.90 µ B (S = 2) which is expected for a free Mn(III) ion in a tetrahedral field. -(KIM, J.; WANG, C.; HUGHBANKS, T.; Inorg. Chem.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.