Magnetocaloric efficiency in a luminescent gadolinium(III) field-induced single-ion magnet

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A new mononuclear gadolinium(III) complex with the antenna-type 3,6-di(2-pyridyl)pyridazine ligand (dppn) has been synthesized and structurally, spectroscopically, and magnetically characterized. It exhibits visible ligand-centered fluorescence when excited with UV light, together with field-induced slow magnetic relaxation and large magnetocaloric effects at low temperatures (–Δ S max = 26.0 J Kg −1 K −1 at T = 2 K and H = 7 T). The magnetic relaxation mechanism is dominated by a Raman process mediated by optical phonons ( n = 3.06), instead of an Orbach process through a magnetic anisotropy barrier, as expected from an almost isolated, isotropic Gd III ion with very weak intermolecular interactions ( θ = −0.059 K).