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

Abstract The syntheses, structure and magnetic property of a novel two dimensional 3d–4f coordination polymer 2 ∞ [CuSmL(NO 3 ) 2 (IN)], 1 (L 2−   =  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 g Cu  = 2.109, g Sm  = 0.476, J CuSm  = − 0.893 cm − 1 , θ  = − 3.37 K, and TIP = 0.001257 emu K mol − 1 with a good discrepancy factor of R χ  = 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.