127I NQR and Crystal Structure Studies of [N(CH3)4]2CdI4

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Ishihara, H.; Horiuchi, K.; Gesing, T.M.; Dou, S.-Q.; Buhl, J.C. et al.: 127I NQR and Crystal Structure Studies of [N(CH3)4]2CdI4. In: Zeitschrift für Naturforschung - Section A Journal of Physical Sciences 55 (2000), Nr. 1-2, S. 225-229. DOI: https://doi.org/10.1515/zna-2000-1-240

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The temperature dependence of 1271 NQR and DSC as well as the crystal structure at room temperature of the title compound were determined. This compound shows a first-order phase transition of an order-disorder type at 245 K. Eight127I(v:1 NQR lines of 79.57, 81.86, 82.56, 83.36, 84.68, 87.72, 88.34, and 88.86 MHz, and corresponding eight 127I(i/2: m = ±| ±) NQR lines were observed at liquid nitrogen temperature. Three l27I(v1) NQR lines with an intensity ratio of 1:1:2 in the order of decreasing frequency were observed just above the transition point and two NQR lines except for the middle-frequency line disappeared around room temperature. This temperature behavior of NQR lines is very similar to that observed in [N(CH3)4]2Hgl4. Another first-order phase transition takes place at 527 K. The structure of the room-temperature phase was redetermined: orthorhombic, Pnma, Z = 4, a = 1342.8(3), b = 975.7(2), c = 1696.5(3) pm. The NQR result of three lines with an intensity ratio of 1:1:2 is in agreement with this structure. The thermal displacement parameters of atoms in both cations and anions are large.
License of this version: CC BY-NC-ND 3.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2000
Appears in Collections:Naturwissenschaftliche Fakultät

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