TIIV AND MOV COMPLEXES WITH DIESTERS - THE CRYSTAL-STRUCTURE OF [ORTHO-C6H4(CO2CH2CH2PH)2CL4TI], [C2O4(CH2CH2PH)2CL4TI] AND [ORTHO-C6H4(CO2ET)2CL3MOO].C6H6

The crystal structures of [o-C6H4(CO2CH2CH2Ph)2Cl4Ti] (I), in the presence of activators a good catalyst for olefin polymerization, [C2O4(CII2CH2Ph)2Cl4Ti] (II) and [o-C6H4(CO2Et)2Cl3Mo(O)] (III), have been determined by X-ray diffraction methods and refined by a full-matrix least-squares technique to R = 0.036, 0.041 and 0.055 for 2775, 2437 and 2776 independent non-zero reflections for I, II and III, respectively. The crystals of I are triclinic, space group P1BAR with two molecules in a unit cell of dimensions a = 10.475(8), b = 10.078(9), c = 13.683(9) angstrom, alpha = 88.75(7), beta = 72.65(6), gamma = 66.95(7)-degrees. The crystals of II are monoclinic, space group P2(1)/c, with four molecules in a cell with a = 10.045(8), b = 21.032(22), c = 13.193(9) angstrom, beta = 128.91(6)-degrees. The titanium atoms in I and II are octahedrally coordinated by four chlorine and two carbonyl oxygen atoms of coordinated o-diester molecules in the cis position. The crystals of III are triclinic, space group P1BAR, with two molecules in a unit cell of dimensions a = 9.722(12), b = 8.073(12), c = 15.683(21) angstrom, alpha = 83.46(9), beta = 75.81(9), gamma = 67.74(9)-degrees. Three Cl atoms, one oxo oxygen and two O atoms of the carbonyl groups form a distorted octahedron around the molybdenum atom. The chelate ligand atoms and the titanium atom in I or molybdenum atom in III form a seven-membered ring which is five-membered in II.