Slow magnetic relaxation in a carboxylate-bridged one dimensional dysprosium complex

Lanthanide(iii) (Er/Ho) coordination polymers for a photocatalytic CO2 cycloaddition reaction

“…This value is smaller in comparison with the earlier report on [Dy 2 (PAA) 6 ] n . 20 The χ M T value sharply drops below 50 K indicating the onset of weak antiferromagnetic interaction, which is further confirmed by the negative θ (K) value (−8.5 K) obtained from the Curie-Weiss fit. 55 From the fit, the Curie constant was found to be 22.3 emu mol −1 K and the experimentally calculated µ eff was 13.35µ B , which is higher than the theoretical value of 9.60µ B per free Er 3+ ion.…”

“…17,18 Aminobenzoic acid derivatives are one big family of organic linkers frequently used to construct lanthanide extended structures. 19 Lanthanide polymers based on dysprosium (Dy), 20,21 praseodymium (Pr), 22 neodymium (Nd) 21,23 or samarium (Sm), 21 for example, were made from 4-aminobenzoic acid, exhibiting 1D chain-like structures with interesting physical properties. Unique slow magnetic behaviours suggesting single molecule magnets were established in Dy-coordination polymers when linked to 4-aminobenzoic acid, 20 2-methylbenzoic acid 24 or 4-nitrobenzoic acid.…”

“…19 Lanthanide polymers based on dysprosium (Dy), 20,21 praseodymium (Pr), 22 neodymium (Nd) 21,23 or samarium (Sm), 21 for example, were made from 4-aminobenzoic acid, exhibiting 1D chain-like structures with interesting physical properties. Unique slow magnetic behaviours suggesting single molecule magnets were established in Dy-coordination polymers when linked to 4-aminobenzoic acid, 20 2-methylbenzoic acid 24 or 4-nitrobenzoic acid. 25 Other lanthanide coordination polymers based on imidazole carboxylic acid showed either large magnetic anisotropy or ferromagnetic interactions.…”

Thermostable 1D Lanthanide 4‐Phenylbenzoate Polymers [Ln(4‐phbz)3]n (Ln = Sm, Eu, Gd, Tb, Dy, Ho) with Isolated Metal Chains: Synthesis, Structure, Luminescence, and Magnetic Properties

“…Apart from the single‐ion CF splitting effect, the low‐temperature magnetic properties of the [Dy(4‐phbz) 3 ] n complex may also depend on some exchange spin coupling between the Dy 3+ ions, especially because of the relatively short Dy ··· Dy distance. Indeed, in the isostructural [Eu(4‐phbz) 3 ] n complex, the Eu ··· Eu distance is 3.6542(3) Å, which is considerably shorter than the Dy ··· Dy distance in other 1D Dy carboxylate polymers, such as 5.028 Å, 4.83 Å, 4.873 Å, 4.2 Å, 4.066 Å, and 3.998 Å. [8c] In particular, a considerably lower χT value for the [Dy(4‐phbz) 3 ] n complex at 2 K (5.24 cm 3 K mol –1 ), as compared with that for other related Dy compounds ( χT > 9.50 cm 3 K mol –1 ),[8c], is likely due to antiferromagnetic exchange interactions between the Dy 3+ ions in the chain.…”

“…Indeed, in the isostructural [Eu(4‐phbz) 3 ] n complex, the Eu ··· Eu distance is 3.6542(3) Å, which is considerably shorter than the Dy ··· Dy distance in other 1D Dy carboxylate polymers, such as 5.028 Å, 4.83 Å, 4.873 Å, 4.2 Å, 4.066 Å, and 3.998 Å. [8c] In particular, a considerably lower χT value for the [Dy(4‐phbz) 3 ] n complex at 2 K (5.24 cm 3 K mol –1 ), as compared with that for other related Dy compounds ( χT > 9.50 cm 3 K mol –1 ),[8c], is likely due to antiferromagnetic exchange interactions between the Dy 3+ ions in the chain. Given the very small exchange parameter for the isostructural Gd complex ( J = –0.053 cm –1 ; Figure ), this exchange coupling is expected to be weak; a more quantitative estimate of the J (Dy–Dy) exchange parameter is difficult, due to the high magnetic anisotropy of Dy 3+ ions and the absence of more detailed low‐temperature experimental magnetic data for the [Dy(4‐phbz) 3 ] n complex.…”