The compounds Co(4,4'-Bipy)(NCS)2, Ni(4,4'-Bipy) (NCS)2, Zn(4,4'-Bipy)(NCS)2, and Cd(4,4'-Bipy)(NCS)2 have been characterized by X-ray diffraction studies. It is shown that Co(4,4'-Bipy)(NCS)2 belongs to the tetragonal crystal system while the other three compounds are ortho-rhombic. Lattice parameters for each of these compounds have been calculated.