ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
On the Subhalides of TelluriumCrystals of Te3Cl2, within the isotypic series Te2X (X = Cl, Br. I) of Te2Br and Te2I, as well as of β-TeI and α-TeI have been prepared and were used for structure determination with single crystal methods.Te3Cl2 is monoclinic, space group P21/n, z = 4, with a = 10.136(15), b = 8.635(3), c = 7.039(8) Å and β = 100.74(6)°. The structure consists of macromolecular units of tellurium atoms, which relation to the structure of elemental tellurium is discussed.Te2X is orthorhombic with space group Pnam. z = 8. Lattic parameters for the bromide [iodide] are: a = 14.921(12) [15.295(3)], b = l2.843(6)[13.694(4)], c = 4.005(3)[4.123(2)] Å. The structure consists of infinite double chains condensed to ribbons of Te6 rings with boat conformation and bridging halogen atoms at the edges.β-TeI is monoclinic, space group C2/m, z = 8, with cell constants a = 15.383(2), b = 4.182(2), c = 11.999(2) Å and β = 128.09(1)°. The structure consists of endless chains of tellurium atoms along which the iodine atoms occupy alternating bridging and terminal positions.α-TeI is triclinic. space group P1, z = 8, with lattice parameters a = 9.958(3), b = 7.992(2), c = 8.212(4) Å α = 104.37(11), β = 90.13(4) and γ = 102.89(7)°. The macromolecular building principle of the subhalides of tellurium is degenerated in α-TeI to a Te4-ring (the Te4I4 molecule).The structures studied are compared to each other and discussed in connection with structures of other tellurium compounds.
Notes:
Kristalle von Te3Cl2, aus der isotypen Reihe Te2X (X = Cl, Br, J) von Te2Br und Te2J, sowie von β- und α-TeJ wurden dargestellt und zur Strukturbestimmung nach Einkristallmethoden verwendet.Te3Cl2 kristallisiert monoklin, Raumgruppe P21/n, z = 4, mit a = 10,136(15), b = 8,635(3), c = 7,039(8) Å und β = 100,74(6)°. Die Struktur besteht aus makromolekularen Bauelementen von Telluratomen, deren Beziehung zur Struktur des elementaren Tellurs behandelt wird.Te2X kristallisiert orthorhombisch, Raumgruppe Pnam, z = 8. Gitterkonstanten für das Bromid [Jodid] sind: a=14,921(12) [15,295(3)], b=12,843(6) [13,694(4)], c=4,005(3) [4,123(2)] Å. Die Struktur besteht aus unendlichen Doppelketten, die zu Bändern von Te6-Ringen mit Bootkonformation kondensiert sind, und verbrückenden Halogenatomen an den Rändern.β-TeJ kristallisiert monoklin, Raumgruppe C2/m, z = 8, mit Gitterkonstanten a = 15,383(2), b = 4,182(2), c = 11,999(2) Å und β = 128,09(1)°. Die Struktur besteht aus unendlichen Ketten von Telluratomen, an welchen die Jodatome alternierend verbrückende und terminale Positionen besetzen.α-TeJ kristallisiert triklin, Raumgruppe P1, z = 8, mit Gitterkonstanten a = 9,958(3), b = 7,992(2), c = 8,212(4) Å, α = 104,37(11), β = 90,13(4) und γ = 102,89(7)°. Der makromolekulare Bauzusammenhang der Subhalogenide des Tellurs ist im α-TeJ zu einem Te4-Ring (dem Te4J4-Molekül) entartet.Die untersuchten Strukturen werden vergleichend und im Zusammenhang mit Strukturen anderer Tellurverbindungen diskutiert.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19764220103
