Our endeavors are devoted to the explanation of the nature of the magnetic relaxation phenomena in the herein prepared [Mn(II)5(HPO4)2(PO4)2(H2O)4]n (1). The behavior investigation indicates the prominence of the half-occupied magnetic centers and the competence of the antiferromagnetic interactions and non-zero magnetic moments. The investigation suggests that the design and synthesis of unusual magnetic center materials with innate unquenched magnetic moments could provide a new route for the production of molecular magnets with magnetic relaxation.