Four new Co(II) complexes with 2-amino-4-methylpyridine, 2-amino-3-methylpyridine, or 2-amino-5-chloropyridine: synthesis, spectroscopy, magnetic properties, and crystal structure

(Acetato-κ(2)O,O')(acetato-κO)bis(2-amino-3-methyl-pyridine-κN(1))cobalt(II)

In the title compound, [Co(CH(3)COO)(2)(C(6)H(8)N(2))(2)], the Co(II) ion is five-coordinated by two pyridine N atoms from two 2-amino-3-methyl-pyridine ligands, two O atoms from one acetate ion and one O atom from another acetate ion in a distorted trigonal-bipyramidal geometry. The pyridine rings are nearly perpendicular to each other [dihedral angle = 84.49 (16)°]. The crystal packing is stabilized by intra-molecular and inter-molecular N-H⋯O hydrogen-bonding inter-actions.

Di-μ-chlorido-bis-[(2-amino-4-methyl-pyridine-κN)-chloridomercury(II)]

In the centrosymmetric dinuclear title compound, [Hg(2)Cl(4)(C(6)H(8)N(2))(2)], the Hg(II) ion is four-coordinated by one pyridine N atom from a 2-amino-4-methyl-pyridine ligand, one terminal Cl atom and two bridging Cl atoms. A distorted tetra-hedral geometry is formed around each Hg(II) ion. The crystal packing is stabilized by intra- and inter-molecular N-H⋯Cl hydrogen bonding. There are also π-π stacking inter-actions in the structure, with centroid-to-centroid distances of 3.594 (6) Å.

Bis(2-amino-3-methyl-pyridine-κN(1))dichloridomercury(II)

In the title compound, [HgCl₂(C₆H₈N₂)₂], the two independent Hg^II cations are each located on a twofold rotation axis and coordinated by two pyridine N atoms from two 2-amino-3-methyl­pyridine ligands and two Cl⁻ anions in a distorted tetra­hedral geometry. An intra­molecular N—H⋯Cl hydrogen bond occurs in each independent complex mol­ecule. Inter­molecular N—H⋯Cl hydrogen bonds occur in the crystal structure.