[Cu(tn)]3[W(CN)8]2·3H2O and [Cu(pn)]3[W(CN)8]2·3H2O: Two Novel Cu(II)−W(V) Cyano-Bridged Two-Dimensional Coordination Polymers with Metamagnetism

Two novel 3d−5d Cu(II)−W(V) cyano-bridged compounds, [Cu(tn)] 3 [W(CN) 8 ] 2 ·3H 2 O ( 1 ) and [Cu(pn)] 3 [W(CN) 8 ] 2 ·3H 2 O ( 2 ), where tn is 1,3-diaminopropane and pn is 1,2-diaminopropane, have been synthesized and characterized structurally and magnetically. The X-ray analyses of the two complexes reveal that they exhibit two-dimensional layer structures with the following crystal data: space group P 2 1 /c, a = 24.459(5) Å, b = 9.6426(19) Å, c = 18.037(4) Å, β = 90.45(3)°, V = 4253.9(15) Å 3, Z = 4 for 1; and space group P 2 1 /c, a = 24.126(5) Å, b = 9.8889(19) Å, c = 18.077(3) Å, β = 90.204(4)°, V = 4312.9(14) Å 3, and Z = 4 for 2 . Magnetic properties of the two compounds have also been investigated. Both show typical metamagnetic behavior. The critical field at which the interlayer antiferromagnetic ground-state switches to a ferromagnetic state is ∼1.25 T for 1 and 0.35 T for 2 at 1.8 K.