Friedrich, Daniel and Pielnhofer, Florian and Schlosser, Marc and Weihrich, Richard and Pfitzner, Arno (2015) Synthesis, Structural Characterization, and Physical Properties of Cs2Ga2S5, and Redetermination of the Crystal Structure of Cs2S6. CHEMISTRY-A EUROPEAN JOURNAL, 21 (4). pp. 1811-1817. ISSN 0947-6539, 1521-3765
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The reaction of CsN3 with GaS and S at elevated temperatures results in Cs2Ga2S5. Its crystal structure was determined from single-crystal X-ray diffraction data. The colorless solid crystallizes in space group C2/c (no. 15) with V=1073.3(4) angstrom(3) and Z=4. Cs2Ga2S5 is the first compound that features one-dimensional chains (1)(infinity)[Ga2S3(S-2)(2-)] of edge- and corner-sharing GaS4 tetrahedra. The vibrational band of the S-2(2-) units at 493 cm(-1) was revealed by Raman spectroscopy. Cs2Ga2S5 has a wide bandgap of about 3.26 eV. The thermal decomposition of CsN3 yields elemental Cs, which reacts with sulfur to provide Cs2S6 as an intermediate product. The crystal structure of Cs2S6 was redetermined from selected single crystals. The red compound crystallizes in space group P (1) over bar with V=488.99(8) angstrom(3) and Z=2. Cs2S6 consists of S-6(2-) polysulfide chains and two Cs positions with coordination numbers of 10 and 11, respectively. Results of DFT calculations on Cs2Ga2S5 are in good agreement with the experimental crystal structure and Raman data. The analysis of the chemical bonding behavior revealed completely ionic bonds for Cs, whereas Ga-S and S-S form polarized and fully covalent bonds, respectively. HOMO and LUMO are centered at the S-2 units.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SOLVOTHERMAL SYNTHESIS; cesium; density functional calculations; gallium; solid-state structures; sulfur |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Arno Pfitzner Chemistry and Pharmacy > Institut für Anorganische Chemie > Arbeitskreis Dr. Richard Weihrich |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 25 Jul 2019 12:08 |
| Last Modified: | 25 Jul 2019 12:08 |
| URI: | https://pred.uni-regensburg.de/id/eprint/6093 |
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