Synthesis, crystal structures, and optical properties of NaCdPnS3 (Pn = As, Sb) |
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Authors: | Yuandong WuWolfgang Bensch |
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Affiliation: | Institut für Anorganische Chemie, Universität Kiel, Max-Eyth-Str. 2, D-24118 Kiel, Germany |
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Abstract: | Two compounds NaCdPnS3 (Pn = As (1), Sb (2)) were synthesized as transparent yellow and red platelets by reacting cadmium powder with the molten mixtures of Na2S/As2S3/S and Na2S/Sb/S at 500 °C. Both compounds are plagued with crystal twinning and acceptable crystal structure refinement could only be obtained by identifying the type of the twinning laws. NaCdAsS3 (1) crystallizes in the monoclinic space group P21/n (no. 14) with a = 5.6561(8), b = 16.5487(15), c = 5.6954(8) Å, β = 90.315(11)°, and Z = 4. NaCdSbS3 (2) crystallizes in the monoclinic space group C2/c (no. 15) with a = 8.1329(6), b = 8.1296(4), c = 17.2600(13) Å, β = 103.499(6)°, and Z = 8. The structures of both compounds feature a 2∞CdPnS3]− layer composed of CdS4] tetrahedra and AsS3] or SbS3] pyramidal units. Between the 2∞CdPnS3]− (Pn = As, Sb) layers the Na+ cations reside in a distorted octahedral environment of S atoms. Compound 1 is characterized with UV/Vis diffuse reflectance spectroscopy and IR and Raman spectra. |
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Keywords: | Alkali polythioarsenate (-antimonate) flux Cadmium thioarsenate (-antimonate) Crystal structures Spectroscopic properties |
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