Polymorphic One-Dimensional (N2H4)2ZnTe: Soluble Precursors for the Formation of Hexagonal or Cubic Zinc Telluride
- 31 August 2005
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 44 (20) , 7078-7086
- https://doi.org/10.1021/ic050833w
Abstract
Two hydrazine zinc(II) telluride polymorphs, (N2H4)2ZnTe, have been isolated, using ambient-temperature solution-based techniques, and the crystal structures determined: α-(N2H4)2ZnTe (1) [P21, a = 7.2157(4) Å, b = 11.5439(6) Å, c = 7.3909(4) Å, β = 101.296(1)°, Z = 4] and β-(N2H4)2ZnTe (2) [Pn, a = 8.1301(5) Å, b = 6.9580(5) Å, c = 10.7380(7) Å, β = 91.703(1)°, Z = 4]. The zinc atoms in 1 and 2 are tetrahedrally bonded to two terminal hydrazine molecules and two bridging tellurium atoms, leading to the formation of extended one-dimensional (1-D) zinc telluride chains, with different chain conformations and packings distinguishing the two polymorphs. Thermal decomposition of (N2H4)2ZnTe first yields crystalline wurtzite (hexagonal) ZnTe at temperatures as low as 200 °C, followed by the more stable zinc blende (cubic) form at temperatures above 350 °C. The 1-D polymorphs are soluble in hydrazine and can be used as convenient precursors for the low-temperature solution processing of p-type ZnTe semiconducting films.Keywords
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