High pressure spectroscopic study of ferricenium hexafluorophosphate: Pressure-induced order-disorder transitions

✍ Scribed by R.T. Roginski; A. Moroz; H.G. Drickamer

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 241 KB
• Volume: 143
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(88)87069-6

✦ Synopsis

Studies of the visible and infrared spectra of polycrystalline ferricenium hexafluorophosphate show discontinuities near 5 kbar.

These changes are attributed to an order-disorder phase transition, which has also been observed at 2 1 I K (atmospheric pressure). A volume decrease of I .66 cm' mol-' has been calculated for this transition, which is significantly less than that for the order-disorder transition which occurs at 347 K. It is proposed that the transition studied here involves at the very least an orientational change for Fe( cp); on the basis of large changes in the spectroscopic features assignable to the cation.