Complicated weak interactions in a hybrid material containing tetra(isothiocyanate)cobalt(II) and 1,19-ethylene-2,29-dipyridinium: synthesis, crystal structure, and magnetic properties.

A new inorganic–organic hybrid material, [EtdiPy][Co(NCS)₄] (1) ([EtdiPy]²⁺ = 1,1′-ethylene-2,2′-dipyridinium), was synthesized and characterized by elemental analysis, IR spectrum, UV-Vis spectrum, ESI-MS, and single-crystal X-ray diffraction. Compound 1 is monoclinic, space group P2₁/n, with a = 21.691(5) Å, b = 8.639(2) Å, c = 21.748(5) Å, β = 90.124(3)°, V = 4075.1(16) Å, Dc = 1.550 g cm, Z = 8, F(000) = 1928, and R1 = 0.0435. The C–H···S hydrogen bond, short S···C, S···N interactions, p···π, and π···π interactions observed in the solid state of 1 give a 3-D structure. Magnetic measurements from 2 to 300 K have shown weak antiferromagnetic exchange with θ = −0.892 K in 1. [ABSTRACT FROM AUTHOR]