一种新型柱撑层状砷酸铁（III）[4,4'-联吡啶鎓]3[Fe9(H2O)6F3(HAsO4)12(AsO4)2].2H2O的合成、结构及磁性

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.

作者信息

Rao Vandavasi K, Green Mark A, Pati Swapan K, Natarajan Srinivasan

机构信息

Framework Solids Laboratory, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India.

出版信息

J Phys Chem B. 2007 Nov 8;111(44):12700-6. doi: 10.1021/jp0749625. Epub 2007 Oct 17.

DOI:10.1021/jp0749625

PMID:17941664

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.

摘要

一种三维砷酸铁[4,4'-bpyH2]3[Fe9(H2O)6F3(HAsO4)12(AsO4)2].2H2O（1），已在水热条件下以4,4'-联吡啶为模板剂合成。该结构由FeO6、FeO3F3八面体单元与HAsO4和AsO4单元相连形成，形成一维和二维单元，其中一维单元起到支柱的作用。一维单元中存在面共享的铁二聚体单元值得注意。详细的磁性研究表明存在两种可能的磁相互作用：层内的反铁磁相互作用以及在极低温度下通过铁二聚体单元在层间的弱铁磁极化。