Poly[[μ-aqua-bis(μ-4,4′-bipyridine-κ²N:N′)bis(μ-3-hydroxyadamantane-1-carboxylato-κ²O:O′)bis(3-hydroxyadamantane-1-carboxylato-κO)dicobalt(II)] heptahydrate]

Abstract

The title coordination compound, {[Co(C11H15O3)4(C10H8N2)2(H2O)]·7H2O}n, consists of a pair of CoII atoms, four 3-hy­droxy­adamantane-1-carboxyl­ate anions (L), one water mol­ecule, two bridging 4,4′-bipyridine (4,4′-bpy) ligands and seven uncoordinated water mol­ecules. Both of the CoII ions are coordinated in a distorted octa­hedral geometry. Four L ligands bind to each pair of CoII atoms in a plane, two of which bridge the two CoII atoms as bidentate groups while the other two coordinate to a single CoII atom in a monodentate mode. Two half-mol­ecules of 4,4′-bipyridine coordinate the CoII atoms from the upside and underside. The packing features extensice O—H⋯O hydrogen bonding.

Supramolecular Isomerism in Cobalt(II) Coordination Polymers Built from 3,5-Bis(trifluoromethyl)benzoate and 4,4′-Bipyridine

“…A priori , it is expected for all the isomers that the bpy linker displaces the four pyridine ligands present in 1 during the reaction, thus leading to a 3D framework if the orientation of bpy preserves the original orientation of the initial pyridine ligands. Actually, 3D-MOFs in which subunits of a dinuclear Co II carboxylate with an aqua bridge are connected by the bpy linker or by other ditopic N , N -bipyridine ligands , have been reported. However, in all the essayed experimental conditions of this work, the aqua bridge present in 1 was lost during the pyridine substitution reaction by bpy to produce different CPs, independently of the solvent used.…”