Hydrothermal technique was used together with a room-temperature process for the synthesis of cobalt-succinate compounds. Four structures are described for two new compounds: K 2 Co(C 4 H 4 O 4 ) 2 and Co(H 2 O) 4 (C 4 H 4 O 4 ). Whatever the solution conditions, carboxylate ligands, which possess a strong nucleophilic character, coordinate each metal ion. However, the coordination ability of carboxylate under hydrothermal conditions is different from that under mild ones. For high-temperature phases, carboxylic groups are multidentate and the organic acts as a "template" during the condensation of the oxygenmetal networks, whereas under room temperature conditions, they are unidentate and infinite structures are obtained via the bridging role of the ligand.

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A new layered cobalt succinate, Co4(OH)2(H2O)2(C4H4O4)3·2H2O, 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:  P1̄, 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) Å3, Z = 2, 5511 F 2 values with I = 2σ(I), R1 = 0.045 and wR2 = 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.

The mesoporous silica superstructure SBA‐1 was studied to obtain a formulation in terms of curvature that is important for surfactant structures and the mechanism of formation of inorganic replicas. The picture shows an oblique view of the atomistic model used to calculate the X‐ray diffraction patterns. Green regions represent the inorganic hydroxylated silica wall of SBA‐1, and the blue volume contains micellar surfactant surrounded by adsorbed water.