Two Tetrachlorocobaltate(II) Salts With Substituted Benzyl Triphenylphosphonium: Syntheses, Crystal Structures, Weak Interactions, and Magnetic Properties

Two new tetrachlorocobaltate(II) salts, [BzTPP](2)[CoCl4]center dot H2O (1) and [4NO(2)BzTPP](2)[CoCl4]center dot H2O (2) ([BzTPP](+) = 1-benzyl-triphenylphosphonium; [4NO(2)BzTPP](+) = 1-(4'-nitrobenzyl)triphenylphosphonium), have been prepared and characterized by elemental analysis, IR, MS, single-crystal X-ray diffraction, and magnetic susceptibility. Both 1 and 2 crystallize in the monoclinic space group P2(1)/c. The [CoCl4](2-) anion exhibits a distorted tetrahedral coordination geometry. The C-H center dot center dot center dot Cl, C-H center dot center dot center dot O, and C-H center dot center dot center dot pi hydrogen bonds in 1 and 2 give rise to a 3D hydrogen-bonded network structure. Magnetic susceptibility measurements in the temperature range 2-300 K show that both 1 and 2 exhibit an antiferromagnetic coupling behavior.