Synthesis, Structure and Magnetic Properties of a New Iron Arsenate, [C10N4H28][{FeF(OH)(HAsO4)}4], with a Layer Structure

✍ Scribed by Sandip Chakrabarti; Swapan K. Pati; Mark A. Green; Srinivasan Natarajan

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 112 KB
• Volume: 2003
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200300838

✦ Synopsis

Abstract

The reaction of FeCl~3~·6H~2~O, H~3~AsO~4~, HF and 1,4‐bis(3‐aminopropyl)piperazine under solvothermal conditions gives rise to a new iron arsenate, [C~10~N~4~H~28~][{FeF(OH)(HAsO~4~)}~4~] (I) with a layered structure. The cell parameters are monoclinic, space group = __P__2~1~/n (no.14), M = 1143.08, a = 9.6320(3), b = 8.3598(3), c = 10.7794(1) Å, β = 115.036(1)°, V = 786.42(4) Å^3^, Z = 4, R~1~ = 0.0492, wR~2~ = 0.1227 [1114 observed reflections with I > 2σ(I)]. The connectivity between FeO~3~F~2~(OH) octahedra and HAsO~4~ tetrahedra forms a secondary building unit (SBU) of the type SBU‐4. The SBU‐4 units are linked together to form a layer structure with apertures formed by 8‐T atoms (T = Fe, As). The amine molecules are disordered and occupy the inter‐lamellar region. To the best of our knowledge, I is the first example of an iron arsenate structure formed from only one type of secondary building unit, SBU‐4. A dimer model has been used to describe the magnetic behavior. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)