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The neutral holmium(III) oxalate octadecahydrate {[Ho 2 (ox) 3 (H 2 O) 6 ]·12H 2 O} n of mixed hexagonal/decagonal (6 3 ·10 3 ) 3D net topology shows important changes in the magnetocaloric efficiency upon dehydration/rehydration by heating and water vapor exposition to give the holmium(III) oxalate decahydrate {[Ho 2 (ox) 3 (H 2 O) 6 ]·4H 2 O} n of hexagonal (6 3 ) 2D net topology through the intermediacy of the elusive amorphous anhydrous compound {Ho 2 (ox) 3 } n .

Thermal-assisted spin crossover and field-induced slow magnetic relaxation coexist in the solid state for the mononuclear cobalt(ii) complex with the non-innocent 2,6-bis(N-4-methoxyphenylformimidoyl)pyridine ligand. One-electron oxidation of the paramagnetic low-spin Co II ion (S Co = 1/2) to the diamagnetic low-spin Co III ion (S Co = 0) leads to the electroswitching of the slow magnetic relaxation in acetonitrile solution.