A cyanometallate- and carbonate-bridged dysprosium chain complex with a pentadentate macrocyclic ligand: synthesis, structure, and magnetism

A novel one-dimensional (1D) polymeric cyanometallate- and carbonate-bridged dysprosium(iii) chain with the formula [Dy-2(L-N5)(2){Fe(CN)(6)}(CO3)(OH)] (1), where L-N5 is 2,14-dimethy[-3,6,10,13,19-pentaazabicyclo[13.3.1]nonadeca-1(19),2,13,15,17-pentaene, was synthesized, providing the first example of a 3d-4f chain complex based on the combination of cyanometallate- and carbonate-bridged ligands. Single-crystal X-ray diffraction analysis shows that the Dy(III) ion is eight-coordinated with the N6O2 donor set originating from a pentadentate macrocyclic ligand L-N5, one [Fe(CN)(6)](3), one CO32- and OH-. The CO32- group bridges two Dy(III) ions to form a dinudear structural unit [Dy-2(L-N5)(2)(CO3)(OH)], which is further [inked by [Fe(CN)(6)](3-) ligands to construct an infinite chain. Magnetic studies reveal that the chain complex exhibits two field-induced slow relaxation processes, with the estimated energy barriers U-eff = 40.2 and 9.8 K, respectively. This work provides a special strategy for the construction of novel single-molecular magnets and single-chain magnets.

Automated summary

A novel 1D polymeric chain complex, based on the combination of cyanometallate- and carbonate-bridged ligands, was synthesized. Magnetic studies revealed two field-induced slow relaxation processes in this chain complex.