Spin Canting and Slow Relaxation in a 3D Pillared Nickel−Organic Framework

A 3D nickel−organic framework formulated as {[Ni2(fum)2(bpt)2(H2O)]·3H2O}n (1), built from a mixed fumaric ion (fum), 1H-3,5-bis(4-pyridyl)-1,2,4-triazole (bpt), and nickel salt, has been hydrothermally synthesized and characterized. Compound 1, having a Ni−fum chain structure in which the chains are pillared by the bpt spacers in a 3D “brick-wall”-like architecture, exhibits canted antiferromagnetism at 5.0 K. Below this temperature, slow relaxation is observed from the alternating-current susceptibility measurements corresponding to the spin-glass-like behavior.