Cu(HCO2)2(pym) (pym = pryimidine): Low-dimensional Magnetic Behavior and Long-range Ordering in a Quantum-spin Lattice
- ORNL
- University of Oxford
- ISIS Facility, Rutherford Appleton Laboratory
- Argonne National Laboratory (ANL)
- University of Tennessee, Knoxville (UTK)
- University of Texas
We synthesized and structurally and magnetically characterized the novel 3D coordination polymer Cu(HCO{sub 2}){sub 2}(pym) (pym = pyrimidine). The compound crystallizes in the monoclinic space group C2/c with a = 14.4639(8) {angstrom}, b = 7.7209(4) {angstrom}, c = 8.5172(5) {angstrom}, {beta} = 126.076(2){sup o}, and V = 768.76(7) {angstrom}{sup 3}. In the structure buckled layers of Cu(HCO{sub 2}){sub 2} are interconnected by pym ligands to afford 1D Cu-pym-Cu chains. Bulk magnetic susceptibility measurements show a broad maximum at 25 K that is indicative of short-range magnetic ordering. Between 12 and 300 K a least-squares fit of the {chi}(T) data to a mean-field-corrected antiferromagnetic chain model yielded excellent agreement for g = 2.224(3), J/k{sub B} = -26.9(2) K, and zJ/k{sub B} = -1.1(3) K. Below {approx}3 K a transition to long-range magnetic ordering is observed, as suggested by a sharp and sudden decrease in {chi}(T). This result is corroborated by muon spin relaxation measurements that show oscillations in the muon asymmetry below T{sub N} = 2.802(1) K and rapidly fluctuating moments above T{sub N}.
- Research Organization:
- Oak Ridge National Laboratory (ORNL); High Flux Isotope Reactor
- Sponsoring Organization:
- SC USDOE - Office of Science (SC)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1003363
- Journal Information:
- Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 4 Vol. 44; ISSN 0020-1669; ISSN 1520-510X
- Country of Publication:
- United States
- Language:
- English
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