Bimetallic MOFs (HO)[Cu(MF)(pyrazine)]·(4 - x)HO (M = V, x = 0; M = Ga, x = 1): co-existence of ordered and disordered quantum spins in the V system.

The title compounds are bimetallic MOFs containing [Cu(pyz)] square lattices linked by MF octahedra. In each, only the Cu spins exhibit long-range magnetic order below 3.5 K (M = V) and 2.6 K (M = Ga). The V spins remain disordered down to 0.5 K.