Synthesis and Structure of Bis[2,6-bis(2-pyridylamino)pyridinium] Tetrachlorocadmiumate(II)

1 INTRODUTION The d10 configuration of Cd(II) permits a wide variety of coordination numbers and geometries[1~3]. In recent years, one-, two- and three-dimensional infinite supramolecular coordination assemblies of Cd(II) have been the subject of great interest owing to their potential applications in catalysis, optical properties, clathration, etc[4~8]. In fabricating the coordination assemblies, organic ligands as well as inorganic anions have been observed to control the structural di…

Synthesis and Structure of Bis[2,6-bis(2-pyridylamino)pyridinium] Tetrachlorocadmiumate(II)

The title compound (H3tpda)2[CdCl4] (H2tpda = 2,6-bis(2-pyridylamino)pyridi-ne) was synthesized by the reaction of CdCl2 with H2tpda in methanol under acidic condition. Single-crystal X-ray analysis reveals that the compound crystallizes in monoclinic, space group P21/n with a = 13.377(3), b = 16.978(3), c = 14.328(3) (A), β = 94.75(3)°, V = 3243.1(11) (A)3, Z = 4, Dc = 1.603 g/cm3, μ = 1.042 mm-1, F(000) = 1576, C30H28CdCl4N10, Mr = 782.82, T = 291(2) K, R = 0.0433 and wR = 0.0848 for observed 4554 reflections with I > 2σ(I). The cadmium(II) atom in the complex anion is tetrahedrally coordinated by four chlorine atoms, whereas, in each [H3tpda]+ cation, one pyridyl nitrogen is protonated. A 3D network is formed by multiple intermolecular hydrogen bonds between the cations and anions as well as π-πinteractions among the pyridyl rings.