Collect. Czech. Chem. Commun. 1993, 58, 1354-1362

Effect of Coordination on the Structure of Tris(N,N-Dimethylaminomethyl)phosphine Oxide

Pavel Vojtíšeka, Jana Podlahováa, Karel Malýb and Jindřich Hašekc

a Department of Inorganic Chemistry, Charles University, 128 40 Prague 2, Czech Republic
b Institute of Physics, Academy of Sciences of the Czech Republic, 180 40 Prague 8, Czech Republic
c Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic


Crystals of tris(N,N-dimethylaminomethyl)phosphine oxide (tmpo) are hexagonal, space group P63; a = 8.723(5), c = 10.636(5) Å, Z = 2, R = 0.039 for 384 observed reflections. The complex [Co(tmpo)2(H2O)2](ClO4)2, forms orthorhombic crystals, space group Pbca, a = 19.16(1), b = 10.576(2), c = 117.043(4) Å, Z = 4, R = 0.069 for 1 409 observed reflections. The molecule is centrosymmetric, with the Co atom lying in the center. The tmpo is coordinated through the oxygen atom and one of the nitrogen atoms. The coordination of the ligand brings about very small changes in the bond lengths and angles except for the P=O bond. The coordinated water molecules play a major part in the structure of [Co(tmpo)2(H2O)2](ClO4)2.