Abstract:Als erste Vertreter der Familien der Hexatellurodigermanate und der Hexatellurodistannate wurden K6[Ge2Te6] und K6[Sn2Te6] dargestellt und ihre Strukturen aufgeklärt. Für die Ge‐Verbindung wurde die Raumgruppe C 2/c gefunden mit den Gitterkonstanten a = 16,010(8) Å, b = 13,619(8) Å, c = 9,713(5) Å, β = 95,19(5)° und 4 Formeleinheiten in der Elementarzelle. Die Sn‐Verbindung kristallisiert in der Raumgruppe P 21/c mit den Gitterkonstanten a = 9,590(5) Å, b = 13,654(8) Å, c = 9,606(5) Å, β = 116,84(5)° und 2 For… Show more
“…The Si-Si bond distances are 2.31 Å and 2.33 Å for the Cu-Si and Ag-Si telluride, respectively, and the Ge-Ge bond distance is 2.43 Å for the Au-Ge telluride. These bonds are typical single bonds, as found in Na 6 Si 2 Te 6 (2.35 Å) [26] and Na 4 Si 2 Te 5 (2.37 Å) [27], or Tl 6 Ge 2 Te 6 (2.45 Å and 2.46 Å) [28] and K 6 Ge 2 Te 6 (2.49 Å) [29]. With the assumption of A III , the assignment of the valenceelectrons is self-evident: (Ba 2+ ) 4 (M + ) 4 (A III ) 2 (Te 2− ) 9 , as in the previously reported silver and copper germanium tellurides [10].…”
“…The Si-Si bond distances are 2.31 Å and 2.33 Å for the Cu-Si and Ag-Si telluride, respectively, and the Ge-Ge bond distance is 2.43 Å for the Au-Ge telluride. These bonds are typical single bonds, as found in Na 6 Si 2 Te 6 (2.35 Å) [26] and Na 4 Si 2 Te 5 (2.37 Å) [27], or Tl 6 Ge 2 Te 6 (2.45 Å and 2.46 Å) [28] and K 6 Ge 2 Te 6 (2.49 Å) [29]. With the assumption of A III , the assignment of the valenceelectrons is self-evident: (Ba 2+ ) 4 (M + ) 4 (A III ) 2 (Te 2− ) 9 , as in the previously reported silver and copper germanium tellurides [10].…”
Abstract The new compound Ba6Sn2P6 crystallizes in the monoclinic system, space group P21/c with lattice constants a = 883.7 ± 0.5 pm b = 1268.8 ± 0.8 pmc= 862.3 ± 0.5 pm β = 114.42 ± 0.10°. The compound is isotypic to K6Sn2Te6 and contains the Sn2P612- -anions which are isosteric with the Sn2Te66- -units.
“…This anion is notably distinct from the [Ge IV 2 N 6 ] 10− unit formed by two edge‐sharing tetrahedra found in Sr 5 [Ge 2 N 6 ] [16] . Similar anionic units were revealed, for example, in a class of alkali metal chalcogenidotetrelates with the general formula A 6 [ Tt 2 Ch 6 ] and A =Na, K, Cs; Tt =Si, Ge, Sn; Ch =S, Se, Te [19–23] . Each of those compounds features ethane‐analogue [ Tt 2 Ch 6 ] 6− ions.…”
The first nitridogermanates(III) Ca6[Ge2N6] and Sr6[Ge2N6] were synthesized from sodium flux and structurally characterized by powder and single crystal X‐ray diffraction, respectively. They crystallize isostructurally to each other and homeotypic to Ca6[Cr2N6]H in space group Rtrue3‾
. They feature unprecedented, mutually isolated, ethane‐like [GeIII2N6]12− anions in a staggered conformation. The compounds are semiconductors according to resistivity measurements and electronic structure calculations, yielding band gaps of 1.1 eV for Ca6[Ge2N6] and 0.2 eV for Sr6[Ge2N6].
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