Quantitative estimation of the antiferromagnetic interaction between Cu(II) and Sm(III) in two dimensional heterometallic coordination polymer with isonicotinic acid as tectons

• A novel two dimensional 3d-4f coordination polymer has been reported here.
• The magnetic study of two dimensional 3d-4f coordination polymer containing isonicotinate ion as tectons.
• The first estimated strength of antiferromagnetic interaction between Cu(II) and Sm(III) ions.

The syntheses, structure and magnetic property of a novel two dimensional 3d–4f coordination polymer 2∞[CuSmL(NO3)2(IN)], 1 (L2−  = N, N′- propylenedi (3-ehoxysalicylideneiminato), the dianion of the Schiff base obtained from the 2:1 condensation of 3-ethoxysalicylaldehyde with 1,3-propanediamine, IN− = the isonicotinate ion) has been reported. The heterobinuclear units are connected through exo-bidentate ligands IN−, leading to an extended 2D structure. A fit of the magnetic susceptibility data yields gCu = 2.109, gSm = 0.476, JCuSm = − 0.893 cm− 1, θ = − 3.37 K, and TIP = 0.001257 emu K mol− 1 with a good discrepancy factor of Rχ = 4.4 × 10− 5. This is the first quantitative estimation of the strength of the antiferromagnetic interaction between Cu(II) and Sm(III) ions to the best of our knowledge.

The syntheses, structure and magnetic property of a novel two dimensional 3d–4f coordination polymer 2∞[CuSmL(NO3)2(IN)] has been reported here. Structurally, this compound is the Cu–Sm containing 3d–4f two dimensional polymer connected by isonicotinate ion. From the magnetic view-point, any group have not reported on the variable temperature magnetic study of these particular types of two dimensional 3d–4f coordination polymers containing isonicotinate ion to the best of our knowledge. It is also notable that the magnetic interaction between CuII–SmIII ions is antiferromagnetic which were predicted in a qualitative and semi quantitative manner in earlier all cases, but for the first time we have reached to the estimated strength of antiferromagnetic interaction between these two ions.Figure optionsDownload as PowerPoint slide