CRYSTAL STRUCTURE OF THE MOLECULAR COMPLEX OF PYRIDINE AND BIS(p-HYDROXYBENZOATO)TRIS(PYRIDINE)CADMIUM (II)

Article abstract of DOI:10.1007/BF00747513

An x-ray structural study of the triclinic crystals of C5H5N has been carried out (diffractometer, Mo radiation, 3127 reflections, heavy-atom method, fullmatrix refinement by the method of least squares in the anisotropic-H-isotropic approximation, R=0.073).The cadmium atom is joined by coordinate bonds to three pyridine molecules and two molecules of para-hydroxybenzoic acid (PHBA); one of the PHBA molecules is coordinated to the central atom to give a chelate structure, and the second uses only one oxygen atom for this bond.The second oxygen atom of the carboxyl group of this acid molecule forms an intermolecular hydrogen bond with the hydroxyl oxygen atom of another PHBA molecule.This H-interaction leads to the formation of a dimer.In the compound studied, the noncoordinated pyridine molecule also forms an H-bond with a coordinated PHBA molecule.An interesting feature of the structure is the simultaneous existence of pyridine in two forms: as an included molecule and in the coordinated state.