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Synthesis, structure and magnetocaloric properties of a new two-dimensional gadolinium(III) coordination polymer based on azobenzene-2,2',3,3'-tetracarboxylic acid.

ABSTRACT: A new Gd³⁺ coordination polymer (CP), namely, poly[diaqua[μ₄-1'-carboxy-3,3'-(diazene-1,2-diyl)dibenzene-1,2,2'-tricarboxylato]gadolinium(III)], [Gd(C₁₆H₇N₂O₈)(H₂O)₂]_n, (I), has been synthesized hydrothermally from Gd(NO₃)₃·6H₂O and azobenzene-2,2',3,3'-tetracarboxylic acid (H₄abtc). The target solid has been characterized by single-crystal and powder X-ray diffraction, elemental analysis, IR spectroscopy and susceptibility measurements. CP (I) crystallizes in the monoclinic space group C2/c. The structure features a 4-connected topology in which Gd³⁺ ions are connected by carboxylate groups into a linear chain along the monoclinic symmetry direction. Adjacent one-dimensional aggregates are bridged by Habtc^3- ligands to form a two-dimensional CP in the (10-1) plane. A very short hydrogen bond [O...O = 2.4393 (4) Å] links neighbouring layers into a three-dimensional network. A magnetic study revealed antiferromagnetic Gd...Gd coupling within the chain direction. CP (I) displays a significant magnetocaloric effect (MCE), with a maximum -ΔS_m of 27.26 J kg^-1 K^-1 for ΔH = 7 T at 3.0 K. As the MCE in (I) exceeds that of the commercial magnetic refrigerant GGG (Gd₃Ga₅O₁₂, -ΔS_m = 24 J kg^-1 K^-1, ΔH = 30 kG), CP (I) can be regarded as a potential cryogenic material for low-temperature magnetic refrigeration.

SUBMITTER: Wei WW

PROVIDER: S-EPMC8491096 | biostudies-literature |

REPOSITORIES: biostudies-literature

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