ELECTRON-SPIN RESONANCE STUDIES OF ZIEGLER-TYPE CATALYSTS .3. COMPLEX DERIVED FROM DICHLOROBIS(ETA-CYCLOPENTADIENYL)VANADIUM AND DIETHYLALUMINUM CHLORIDE

The reaction between CP2VCI2 in CH2CI2 and Et AlCl in n-heptane yields a paramagnetic product giving the ESR parameters A iso = 4.11 mT, giso = 1.996 at room temperature. At 77 K a frozen solution spectrum was obtained having the parameters Ax = -6.37 mT, Ay = -7.05 mT, Az = +1.09 mT, gx = 2.001, gy = 1.987, gz = 2.000. Analysis of this spectrum indicates that the complex is Cp2VH(µ-Cl)2AlX2 (where X is Cl or Et), having a distorted trigonal bipyramidal structure and Cn. symmetry about the vanadium. The spectrum of the complex corresponds to species II in part 1 of this series.2. © 1979, American Chemical Society. All rights reserved.