THE SYNTHESIS AND CHARACTERIZATION OF ALPHA-W2CL4(DPPP)(2)

To date, few quadruply bonded ditungsten compounds have been synthesiz ed. Only four bidentate phosphine ligands (L-L) have been utilized in the synthesis of compounds of the general type W2Cl4(L-L)(2). These ph osphine ligands include: bis(diphenylphosphino)methane (dppm) [1], 1,2 -bis(diphenylphosphino)ethane (dppe) [2], 1,2-bis(dimethylphosphino)et hane (dmpe) [3] and 1,3-bis(diisopropylphosphino)propane (dippp) [4]. Of particular interest is the ability of these bidentate ligands to ch elate to one metal center (alpha form) or bridge both metal centers (b eta form). Results from the synthesis and characterization of alpha-W2 Cl4(dppp)(2) (dppp=1,3-bis(diphenylphosphino)propane) are discussed. C rystallographic data for this compound are as follows: P1 (No. 2) with a=11.934(9), b=12.315(7), c=12.513(4) Angstrom, alpha=83.82(4), beta= 75.03(5), gamma=62.01(5)degrees, V=1569(2) Angstrom(3) and Z=1.