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

Abstract

A new tetrachlorocobalt(II) salt, [QlH] 2 [CoCl 4 ]·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) Å, b = 10.069(1) Å, c = 18.494(2) Å, β = 101.35(1) Å, V = 2163.3(4) Å 3 , Z = 4. The unit cell contains two [QlH] + cations, one [CoCl 4 ] 2-anion and two water molecules. The [QlH] + cations stack and form a 1D column through p···π and π ···π interactions. The water molecules are linked to the anions through O-H···Cl hydrogen bonds to form two-dimensional molecular networks. The cations and [CoCl 4 ] 2-anions are linked through N-H···O and C-H···O hydrogen bonds and give further rise to a 3D hydrogenbonding network structure. Magnetic susceptibility measurement in the temperature range 2-300 K shows that 1 exhibits a weak antiferromagnetic coupling behavior with θ = -2.90 K.

Triphenylene-ethylammonium tetrachlorometallate salts: multicolumnar mesophases, thermochromism and Langmuir films

“…45,46 The cobaltate salt shows, in addition, an intense absorption band at lower energy assigned to an 4 A 2 → 4 T 1 ( 4 P) transition in the tetrahedral [CoCl 4 ] 2− group. 47 In contrast, for the other tetrachlorometallate derivatives only broad low-intensity absorption bands in the range 400–480 nm are observed, in accordance with their octahedral or distorted-octahedral coordination geometries (Fig. 2).…”