Cu(HCO2)2(pym) (pym = pyrimidine): Low-Dimensional Magnetic Behavior and Long-Range Ordering in a Quantum-Spin Lattice
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- 作者：J. L. Manson ; T. Lancaster ; L. C. Chapon ; S. J. Blundell ; J. A. Schlueter ; M. L. Brooks ; F. L. Pratt ; C. L. Nygren ; and J. S. Qualls
- 刊名：Inorganic Chemistry
- 出版年：2005
- 出版时间：February 21, 2005
- 年：2005
- 卷：44
- 期：4
- 页码：989 - 995
- 全文大小：183K
- 年卷期：v.44,no.4(February 21, 2005)
- ISSN：1520-510X
文摘
We synthesized and structurally and magnetically characterized the novel 3D coordination polymer Cu(HCO2)2(pym) (pym = pyrimidine). The compound crystallizes in the monoclinic space group C2/c with a = 14.4639(8) Å,b = 7.7209(4) Å, c = 8.5172(5) Å, 
beta2.gif" BORDER=0 ALIGN="middle"> = 126.076(2)
, and V = 768.76(7) Å3. In the structure buckled layers ofCu(HCO2)2 are interconnected by pym ligands to afford 1D Cu-pym-Cu chains. Bulk magnetic susceptibilitymeasurements show a broad maximum at 25 K that is indicative of short-range magnetic ordering. Between 12and 300 K a least-squares fit of the 
(T) data to a mean-field-corrected antiferromagnetic chain model yieldedexcellent agreement for g = 2.224(3), J/kB = -26.9(2) K, and zJ'/kB = -1.1(3) K. Below ~3 K a transition tolong-range magnetic ordering is observed, as suggested by a sharp and sudden decrease in (T). This result iscorroborated by muon spin relaxation measurements that show oscillations in the muon asymmetry below TN =2.802(1) K and rapidly fluctuating moments above TN.
beta2.gif" BORDER=0 ALIGN="middle"> = 126.076(2), and V = 768.76(7) Å3. In the structure buckled layers ofCu(HCO2)2 are interconnected by pym ligands to afford 1D Cu-pym-Cu chains. Bulk magnetic susceptibilitymeasurements show a broad maximum at 25 K that is indicative of short-range magnetic ordering. Between 12and 300 K a least-squares fit of the (T) data to a mean-field-corrected antiferromagnetic chain model yieldedexcellent agreement for g = 2.224(3), J/kB = -26.9(2) K, and zJ'/kB = -1.1(3) K. Below ~3 K a transition tolong-range magnetic ordering is observed, as suggested by a sharp and sudden decrease in (T). This result iscorroborated by muon spin relaxation measurements that show oscillations in the muon asymmetry below TN =2.802(1) K and rapidly fluctuating moments above TN.