Four {DyIIIMII} analogues with triple carboxylate mediators were reported.
The {DyIIINiII}, {DyIIIFeII} and {DyIIIZnII} show field-induced SMM behavior.
The {DyIIICuII} displays slow frequency-independent relaxation by quantum tunneling.
These magnetic results afford significant information for the 3d-4f SMMs.