K2FeF5: Synthesis and Crystal Structure of a New Form

✍ Scribed by J.L. Fourquet; H. Duroy

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 162 KB
• Volume: 103
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1110

✦ Synopsis

Single crystals of a new form of (\mathrm{K}{2} \mathrm{FeF}{5}) have been grown by hydrothermal synthesis in concentrated HF solutions. The structure is established from single crystal X-ray diffraction data: space group Pbam, (Z=8, a=7.3591) (4) (\AA, b=23.0897) (10) (\AA), and (c=5.7054) (2) (\AA\left(R=0.0257, R_{\mathrm{w}}=0.0273\right.) for 1530 independent reflections and 84 parameters). The network is built with infinite and single linked cis-chains of (\mathrm{FeF}{6}) octahedra, running along the (c) axis, separated by 10 coordinated potassium ions. The structure is compared to those of (\mathrm{Rb}{2} \mathrm{CrF}{5}) and of the previously known (\mathrm{K}{2} \mathrm{FeF}{5}) form ( (P b c n) ), showing respectively the same single linked and double linked chains of (M \mathrm{~F}{6}) octahedra. 01993 Academic Press. Inc.