Cyclic Trinuclear and Chain of Cyclic Trinuclear Copper (II) Complexes Containing a Pyramidal Cu3O (H) Core. Crystal Structures and Magnetic Properties of Cu3 (μ3-OH) (aaat) 3 (H2O) 3 (NO3) 2·H2O aaat = 3-Acetylamino-5-amino-1, 2, 4-triazolate and Cu3 (μ3-OH) (aat) 3 (μ3-SO4) ·6H2On aat = 3-Acetylamino-1, 2, 4-triazolate: New Cases of Spin-Frustrated Systems