Structural and magnetic properties of quasi-1 and 2D pyrazine-containing spin-1/2 antiferromagnets.
Aqueous reaction of Cu(BF{sub 4}){sub 2}, NH{sub 4}HF{sub 2}, and pyrazine leads to formation of a novel 3D framework, [Cu(HF{sub 2})(pyz){sub 2}]BF{sub 4} (1), where 2D [Cu(pyz){sub 2}]{sup 2+} square layers are connected via HF{sub 2}{sup -}. A second compound, Cu(ReO{sub 4}){sub 2}(H{sub 2}O){sub 2}(pyz) (2), was the result of our attempt to create the perrhenate analog of 1; a linear chain compound consisting of CuO{sub 4}N{sub 2} octahedra linked through pyrazine ligands formed instead. Both compounds exhibit extensive hydrogen bonding interactions where bifluoride, F...H...F{sup -}, and O-H...O link layers and chains together in 1 and 2, respectively. Broad maxima indicative of short-range magnetic ordering (SRO) were observed in the magnetic susceptibility at 5.5 (1) and 7.7 K (2) while no evidence for the transition to long-range magnetic ordering (LRO) was detected above 2 K.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1000656
- Report Number(s):
- ANL/MSD/CP-119304; TRN: US201101%%441
- Journal Information:
- Polyhedron, Vol. 26, Issue 9-11 (Spec. Issue) ; Jun. 2007; Conference: 10th International Conference on Molecule-Based Magnets (ICMM); Aug. 13, 2006 - Aug. 17, 2006; Victoria, Canada
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Synthesis and properties of pyrazine-pillared Ag{sub 3}Mo{sub 2}O{sub 4}F{sub 7} and AgReO{sub 4} layered phases
Structural Electronic and Magnetic Properties of Quasi-1D Quantum Magnets [Ni(HF2)(pyz)2]X (pyz = pyrazine; X = PF6- SbF6-) Exhibiting Ni-FHF-Ni and Ni-pyz-Ni Spin Interactions