| | 1 | Author
| A. Ishikawa, M. Kurasawa, S. Kitahara, A. Sasane, N. Kojima, R. Ikeda | Requires cookie* | | | Title
| A 35 C1 NQR Study on CS 2 [AU I C1 2 ] [Au m Cl 4 ]  | | | | Abstract
| A pair of 35 C1 NQR spin echo signals has been observed for the mixed valence complex Cs 2 [Au'Cl 2 ] [Au'^C^] between 77 and 243 K. At 77 K, two resonance lines with the half widths Av Q ~ 50 kHz were located at v Q1 = 17.28 MHz for the Au'-Cl chlorine and at v Q2 = 27.10 MHz for the Au m -Cl chlorine in accordance with the crystal structure. The chlorine ionic characters of the Au'-Cl and Au'"-Cl bonds are estimated as 0.63 and 0.42, respectively. The central gold atom carries a fractional protonic charge of 0.26 in [AU'C1 2 ]~ and 0.68 in [Au"'Cl 4 p. The charge distributions in the complex anions differ in-significantly from those in the isolated [AUC1 2 ]~ and [AUC1 4 ]" for ordinary complexes, indicating that the charge transfer interactions between the anions are weak in the mixed valence complex. The ob-served linear temperature dependencies of Vg and log T lQ are well explained by the lattice vibration. When the temperature was increased from 77 K, the resonance lines became gradually weak without changing AV q and immeasurable above 215 K. ESR spectra taken at various temperatures revealed the presence of paramagnetic sites of ca. 5x 10 2<) mol -1 arising from Au(II). The small but finite concen-tration of Au(II) or some other reason should be responsible for the fade out phenomenon and the large Avq observed. | | | |
Reference
| Z. Naturforsch. 53a, 590—594 (1998); received December 31 1997 | | | |
Published
| 1998 | | | |
Keywords
| 35 C1 NQR Frequency, 35 C1 NQR Spin-lattice Relaxation, Mixed Valence Gold Complex, Charge Transfer Interaction, ESR | | | |
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| ZNA-1998-53a-0590 | | | | Volume
| 53 | |
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