Hybrid Open Networks (MIL 16): Synthesis, Crystal Structure, and Ferrimagnetism of Co₄(OH)₂(H₂O)₂(C₄H₄O₄)₃·2H₂O, a New Layered Cobalt(II) Carboxylate with 14-Membered Ring Channels

A new layered cobalt succinate, Co 4 (OH) 2 (H 2 O) 2 (C 4 H 4 O 4 ) 3 ·2H 2 O, was prepared under hydrothermal conditions at 180 °C from a 1:1.5:4:120 mixture of Co(II) chloride hexahydrate, succinic acid, potassium hydroxide, and water. The structure was solved by single-crystal X-ray diffraction: P 1̄, a = 10.181(2), b = 10.668(2), c = 12.857(2) Å, α = 112.97(3)°, β = 91.24(3)°, γ = 117.96(3)°, V = 1099.1(4) Å 3, Z = 2, 5511 F 2 values with I = 2σ( I ), R 1 = 0.045 and wR 2 = 0.114. The title compound presents a structure constituted by the stacking along [100] of metal oxide layers in which 14-membered ring windows appear. Succinate anions linked the cobalt atoms within each layer. From magnetization measurements, this compound is ferrimagnetic below 10 K.