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Title: Crystal structure and antiferromagnetic ordering of quasi-2D [Cu(HF{sub 2})(pyz){sub 2}]TaF{sub 6} (pyz = pyrazine).

The crystal structure of the title compound was determined by X-ray diffraction at 90 and 295 K. Copper(II) ions are coordinated to four bridging pyz ligands to form square layers in the ab-plane. Bridging HF{sub 2}{sup -} ligands join the layers together along the c-axis to afford a tetragonal, three-dimensional (3D) framework that contains Taf{sub 6}{sup -} anions in every cavity. At 295 K, the pyz rings lie exactly perpendicular to the layers and cooling to 90 K induces a canting of those rings. Magnetically, the compound exhibits 2D antiferromagnetic correlations within the 2D layers with an exchange interaction of -13.1(1) K. Weak interlayer interactions, as mediated by Cu-F-H-F-Cu, leads to long-range magnetic order below 4.2 K. Pulsed-field magnetization data at 0.5 K show a concave curvature with increasing B and reveal a saturation magnetization at 35.4 T.
Authors:
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Publication Date:
OSTI Identifier:
975013
Report Number(s):
ANL/MSD/JA-64698
Journal ID: ISSN 0022-2291; JLTPAC; TRN: US201007%%942
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Low Temp. Phys.; Journal Volume: 159; Journal Issue: 1-2 ; Apr. 2010
Research Org:
Argonne National Laboratory (ANL)
Sponsoring Org:
SC; NSF; Research Corp.
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ANIONS; CRYSTAL STRUCTURE; EXCHANGE INTERACTIONS; MAGNETIZATION; SATURATION; X-RAY DIFFRACTION