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

Journal Article · Thu Apr 01 04:00:00 EDT 2010 · J. Low Temp. Phys.

DOI:https://doi.org/10.1007/s10909-009-0079-5· OSTI ID:975013

Manson, J L; Schlueter, J A; McDonald, R D; Singleton, J; LANL,

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.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF; Research Corp.
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 975013
• Report Number(s): ANL/MSD/JA-64698
• Journal Information: J. Low Temp. Phys., Journal Name: J. Low Temp. Phys. Journal Issue: 1-2 ; Apr. 2010 Vol. 159; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
ANIONS
CRYSTAL STRUCTURE
EXCHANGE INTERACTIONS
MAGNETIZATION
SATURATION
X-RAY DIFFRACTION