CRYSTAL AND MOLECULAR-STRUCTURES OF 4,6-DIMETHYLPYRIMIDINE-2-THIONETETRAAQUACOBALT(II) DINITRATE COMPLEX AND OF 2 PYRIMIDINE THIONES

The crystal structures of 4,6-dimethylpyrimidine-2-thionetetraaquacoba lt(II) dinitrate (I) a=9.032(2), b=12.458(2), c=18.067(3)Angstrom., be ta=103.25(3)degrees, Z=4; P2(I)/c, R=0.049; 1-phenyl-4,6-dimethylpyrim idine-2-thione (II) a=12.005(3), b=10.090(2), c=9.649(2)Angstrom, beta =104.4(1)degrees, Z=4; P2(I)/n, R=0.038; and 4,6-dimethylpyrimidine-2- thione (III) a=15.485(3), b=13.255(3), c=7.127(2)Angstrom, beta=104.3( 1)degrees, Z=8, C2/c, R=0.041 are reported. In (I) the coordination ar ound the cobalt(II) is distorted octahedral involving one ligand molec ule via sulphur and nitrogen atoms and four water molecules. It is rel evant that the parameters in the complexed ligand are not different fr om those found in the uncomplexed one (II), excepting the distances on the nitrogen atom directly involved in the coordination. Bond distanc es and angles in compound (III) agree with those found in (II).