Pyridine-Type Complexes of Transition-Metal Halides VII. Thermal and Structural Properties of Cobalt(II) Halide Complexes Formed with 2-Halogenopyridines.

Halogen Bonding in Isostructural Co(II) Complexes with 2-Halopyridines

“…Surprisingly, the analysis of previously published XRD data indicates that complexes with 2-halopyridines (2-XPy) are less studied than those with 3-, 4-or polysubstituted pyridines. In relation to 2-XPy, there are structurally characterized examples for Pd [24], Co [25], and Cu [26][27][28][29], (1, 1, and 7, respectively), although the preparation procedures [30,31], the features of thermal decomposition [32], and IR spectra [33] for several relevant Co complexes were described earlier. In order to fill this gap, we prepared a series of cobalt(II) complexes of the general formula [Co(2-XPy)Cl 2 ] (X = Cl (1), Br (2) and I (3)) which, according to the XRD data, are isostructural (the maximal deviations of the unit cell parameters are 0.342 Å) and, therefore, represent an attractive and rare object for the study of XB nature.…”