Vibrational Study of a Polycrystalline Sample of the New Chromium Thiophosphate CrP3S9.25

✍ Scribed by C. Sourisseau; P. Fragnaud; E. Prouzet; R. Brec

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 292 KB
• Volume: 112
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1994.1308

✦ Synopsis

A vibrational study of (\mathrm{CrP}{3} \mathrm{~S}{9.25}) was undertaken in order to confirm the substitution of some (\mathrm{S}^{2 \cdot}) anions by (\left(\mathrm{S}{2}\right)^{2-}) pairs as focused by a (X)-ray single-crystal analysis. Comparison between the infrared and Raman spectra allowed us to assign the main vibrational bands. Very similar spectra were observed for (\mathrm{Ag}{2} \mathrm{P}{2} \mathrm{~S}{6}) and (\mathrm{CrP}{3} \mathrm{~S}{9.25}) in the (100-600 \mathrm{~cm}^{-1}) range, allowing confident internal vibrational mode assignments of the (\left(\mathrm{P}{2} \mathrm{~S}{6}\right)^{2-}) anions. An assignment to the (\left(\mathrm{S}{2}\right)^{2-}) group stretching mode in (\mathrm{CrP}{3} \mathrm{~S}_{9.25}) is mainly suggested from Raman results. The (491 \mathrm{~cm}^{-1}) signal attributed to this vibration led to a (S-S) distance estimate of (2.10 \AA), in good agreement with the crystal structure determination (2.07 &). O 1994 Academic Press, Inc.