Mild Hydrothermal Synthesis, Crystal Structure and Magnetic Behavior of AgCu(IO3)3: a Quasi-one-dimensional S =1/2 Chain Compound

摘要

A new complex AgCu(IO3)3 is synthesized by mild hydrothermal method and.characterized by single-crystal X-ray diffraction and magnetization measurement.AgCu(IO3)3 is triclinic,space group P(1),with a =7.3081(1),b =7.8089(1),c =8.2447(1) (A),a =67.159(1),β =74.982(1),γ =80.982(1)°,and Z =2.AgCu(IO3)3 is isostructral with AgPb(IO3)3.The structure of AgCu(IO3)3 consists of CuO6 chain columns parallel to the c axis,formed by comer-sharing Cu(1) and Cu(2) octahedra and flanked by comer-sharing IO3 groups;these CuO6 columns are cross-linked into a three-dimensional framework through I-O and AgO bonds.I(1),I(2) and I(3) are coordinated respectively with 3 oxygens on the same side to form trigonal pyramids confirming the presence of a stereochemically active lone pair of each Ⅰ5+ cation.In the CuO6 chain columns,Cu(1)O6 and Cu(2)O6 octahedra are tetragonally distorted with four shorter bonds in the square planes and two longer apical bonds.Cu(1)O6 octahedra were comer sharing with Cu(2)O6 octahedra with a shorter Cu(1)-O(1) bond in the square planes and a longer apical Cu(2)-O(1) bond,which forms a Cu(1)-Cu(2) magnetic chain along the c direaction.Magnetization measurement shows weak antiferromagnetic property in low temperature range.AgCu(IO3)3 provides a new example of a quasi-one-dimensional magnetic system.