Two series of Er and Yb thiocyanates were studied as SMMs. Some empirical patterns for further development of Er and Yb based SMMs were proposed. The Δeff value for Yb aquathiocyanate is among the highest known for molecular complexes of this Ln.
Novel derivatives of lanthanides and (η6-benzoic acid)tricarbonylchromium were synthesized and characterized; complexes of Tb, Dy, Er and Yb exhibit SMM behavior.