We use cookies to ensure that we give you the best experience on our website. You can change your cookie settings at any time. Otherwise, we'll assume you're OK to continue.

Durham University

Department of Physics

Staff profile

Publication details for Professor Tom Lancaster

Manson, J.L., Lancaster, T., Chapon, L.C., Blundell, S.J., Schlueter, J.A., Brooks, M.L., Pratt, F.L., Nygren, C.L. & Qualls, J.S. (2005). Cu(HCO2)(2)(pym) (pym = pyrimidine) low-dimensional magnetic behavior and long-range ordering in a quantum-spin lattice. Inorganic chemistry 44(4): 989-995.

Author(s) from Durham


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, β = 126.076(2)°, and V = 768.76(7) Å3. In the structure buckled layers of Cu(HCO2)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 χ(T) data to a mean-field-corrected antiferromagnetic chain model yielded excellent agreement for g = 2.224(3), J/kB = −26.9(2) K, and zJ‘/kB = −1.1(3) K. Below ∼3 K a transition to long-range magnetic ordering is observed, as suggested by a sharp and sudden decrease in χ(T). This result is corroborated by muon spin relaxation measurements that show oscillations in the muon asymmetry below TN = 2.802(1) K and rapidly fluctuating moments above TN.