title: Synthesis, structure, and magnetic properties of a novel pillared layered iron(III) arsenate, [4,4'-bpyH2]3[Fe9(H2O)6F3(HAsO4)12(AsO4)2].2H2O.
abstract: A three-dimensional iron arsenate [4,4'-bpyH2]3[Fe9(H2O)6F3(HAsO4)12(AsO4)2].2H2O, 1, has been synthesized using 4,4'-bipyridine as the templating agent under hydrothermal conditions. The structure is formed by FeO6, FeO3F3 octahedral units connected with HAsO4 and AsO4 units, forming one- and two-dimensional units in which the one-dimensional units act as a pillar. The presence of face-shared Fe-dimer units in the one-dimensional unit is noteworthy. Detailed magnetic studies indicate two possible magnetic interactions: antiferromagnetic interactions within the layer and a weak ferromagnetic polarization between the layers at very low temperatures through the Fe-dimer units.
authors.affiliation: Framework Solids Laboratory, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India.
authors.forename: Vandavasi K
authors.initials: VK
authors.lastname: Rao
authors.forename: Mark A
authors.initials: MA
authors.lastname: Green
authors.forename: Swapan K
authors.initials: SK
authors.lastname: Pati
authors.forename: Srinivasan
authors.initials: S
authors.lastname: Natarajan
mesh_terms: D001149:Arsenates / Q000138:chemical synthesis / Q000737:chemistry; D018360:Crystallography, X-Ray; D005290:Ferric Compounds / Q000138:chemical synthesis / Q000737:chemistry; D008280:Magnetics; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D013696:Temperature
chemical_list: D001149:Arsenates; D005290:Ferric Compounds; D009942:Organometallic Compounds