Synthesis, Three-Dimensional Network Structure, Weak Interactions, and Magnetic Properties of Bis(quinolinium) Tetrachlorocobaltate(II) Dihydrate

A new tetrachlorocobalt(II) salt, [QlH](2)[CoCl4]center dot 2H(2)O(1) ([QlH](+) = quinolinium), has been prepared and characterized by elemental analysis, IR, UV-Vis, ESI-MS, single-crystal X-ray diffraction, and magnetic susceptibility. Compound 1 crystallizes in the monoclinic space group C2/c with cell dimensions a = 11.848(2) angstrom, b = 10.069(1) angstrom, c = 18.494(2) angstrom, beta = 101.35(1) angstrom, V = 2163.3(4) angstrom(3), Z = 4. The unit cell contains two [QlH](+) cations, one [CoCl4](2-) anion and two water molecules. The [QlH](+) cations stack and form a 1D column through p center dot center dot center dot pi and pi center dot center dot center dot pi interactions. The water molecules are linked to the anions through O-H center dot center dot center dot Cl hydrogen bonds to form two-dimensional molecular networks. The cations and [CoCl4](2-) anions are linked through N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds and give further rise to a 3D hydrogen-bonding network structure. Magnetic susceptibility measurement in the temperature range 2-300K shows that 1 exhibits a weak antiferromagnetic coupling behavior with theta = -2.90K.