A new open-framework aluminum-iron phosphate (C4H12N2)(2)[Fe2Al5(PO4)(8)(H2O)] (denoted as FeAPO-CJ51), with mixed-valence iron (II, III) has been hydrothermally synthesized by using piperazine as the template. The three-dimensional framework of FeAPO-CJ51 is constructed by the connection of metal-centered MOn (M = Fe/Al, n = 4, 5, 6) polyhedra and PO4 tetrahedra, which contains interconnecting 8-ring channels along the  and  directions. Diprotonated piperazine cations locate in the 8-ring channels to compensate the negative charge of the anionic framework. Mossbauer and magnetic susceptibility measurements show that equal amounts of Fe2+ and Fe3+ are present in FeAPO-CJ51, which undergo the long-range antiferromagnetic interactions.
Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China;Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Lab Environm Sci & Technol, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Peoples R China
Guo, Yanan,Qiu, Yuchen,Li, Jiyang,et al. Synthesis and characterization of a new open-framework mixed-valence aluminum-iron phosphate (C4H12N2)(2)[Fe2Al5(PO4)(8)(H2O)][J]. INORGANIC CHEMISTRY COMMUNICATIONS,2014,47(47):99-101.