Something You Need Might Be under Your Feet: Molecular Magnetism of Heavy Kramers Lanthanide Hydrated Chlorides and Their Complexes with Polydentate Terpy Ligand

A study of the molecular magnetism of the hydrated salts [Ln(H2O)(6)Cl-2]Cl (Ln = Gd (1Gd), Dy (1Dy), Er (1Er), Yb (1Yb)) and lanthanide chloride complexes with 2,2 ';6 ',2 ''-terpyridine (terpy) synthesized on their basis, [Ln(H2O)(4)(terpy)Cl]Cl-2 center dot 3H(2)O (Ln = Gd (2Gd), Dy (2Dy), Er (2Er), and Yb (2Yb), was carried out. It was found that both the initial hydrated chlorides containing Dy, Er, Yb, and their derivatives with terpyridine exhibit the properties of single-molecule magnets. For the complexes with terpyridine, the values of the remagnetization barriers increase from Er to Dy, while for the aquachlorides, the corresponding values increase in the series U-eff (1Dy) < U-eff (1Er). It was found that magnetic relaxation in Yb complexes mostly proceeds according to the Raman mechanism.