Synthesis, crystal structure and magnetic properties of one-dimensional coordination polymers

Three new coordination polymers of Robson-type macrocycles, {[Cu2L1(bipy)]·(ClO4)2·CH3CN}∞ (1), {[Cu2L2(bipy)]·(ClO4)2·H2O}∞ (2) and {[Cu2L1(C8H4O4)]·(H2O)3}∞ (3) (where H2L1and H2L2 are the [2+2] condensation products of 1,3-diaminopropane with 2,6-diformyl-4-flurophenol and 2,6-diformyl-4-chlorophenol, respectively), have been synthesized and characterized. The magnetic susceptibility was measured for 1, 2 and 3 over the temperature range 2–300 K. The optimized magnetic data were J = −317.6 cm−1, j′ = 4.01 cm−1, ρ = 0.00031 with R = 8.5 × 10−39 for 1, J = −320.91 cm−1, j′ = 4.39 cm−1, ρ = 0.0013 with R = 1.8 × 10−39 for 2 and J = −221.01 cm−1, TIP = 0.00225, with R = 6 × 10−5 for 3.

Three one-dimensional macrocyclic dinuclear coordination polymers, featuring 4,4′-bipy/terephthalic acid bridging between two macrocyclic units, were prepared and structurally characterized. The magnetic measurements revealed that 4,4′-bipy can serve as a weak magnetic pathway, resulting in a ferromagnetic interaction between the Cu(II) ions in two adjacent macrocyclic units, and there are strong antiferromagnetic interactions between the two Cu(II) ions in the macrocyclic units for the complexes.Figure optionsDownload as PowerPoint slide