Synthesis, characterization, and structures of Group IV metallocene complexes of heterodifunctional ligands containing oxygen and sulfur donor atoms
作者:Han Mou Gau、Chien An Chen、Shiow Jiuan Chang、Wei En Shih、Teng Kuei Yang、Ting Ting Jong、Mei Yueh Chien
DOI:10.1021/om00028a054
日期:1993.4
The interaction of the chiral difunctional ligand (1R,2S,3R)-3-mercapto-1,7,7-trimethylbicyclo[2.2.1]heptan-2-ol (1) with group IV metallocene complexes affords the product Cp2M(OC10H16S) (Cp = cyclopentadienyl; M = Ti (2) or Zr (3); OC10H16S = (1R,2S,3R)-3-thio-1,7,7-trimethylbicyclo[2.2.1]heptan-2-olato). In CDCl3 solution, complex 3 exists as a mixture of a monomeric species and an associated dimeric species. Complex 3 readily hydrolyzes to give an air-stable complex, [CP2Zr(mu-O) (mu-OC10H16S)ZrCp2)] (4). The complex 4 crystallizes in the orthorhombic space group P2(1)2(1)2, with cell parameters a = 10.061 (2) angstrom, b = 15.476 (4) angstrom, c = 17.741 (3) angstrom, v = 2762.4 (10) angstrom3 R = 0.044, and R(W) = 0.052. The complex 4 is an oxo-bridged zirconocene dimer that is also bridged by a heterodifunctional ligand. The Zr-O-Zr angle is small at 139.9 (2)-degrees, and the Zr...Zr distance is 3.685 angstrom. Two zirconocene moieties are inequivalent due to the asymmetric difunctional ligand. The related complex [CP2Zr(mu-OCH2CH2S)]2 (5) was also prepared. Complex 5 crystallizes in the monoclinic space group P2(1)/c with cell parameters a = 16.730 (3) angstrom, b = 8.232 (2) angstrom, c = 17.570 (2) angstrom, beta = 111.21 (2)-degrees, V = 2255.9 (7) angstrom3, R = 0.034, and R(w) = 0.045. The complex 5 is a zirconocene dimer bridging through the oxygen atoms. The ZrOZrO framework is nearly planar with both sulfur atoms above the plane by approximately 0.45 angstrom, and the Zr...Zr distance at 3.719 angstrom is somewhat longer than that in complex 4.