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This paper reports the crystal and molecular structures of tetrakis (cyclopentadienyl) bis(o-tolyl)-μ-oxo-dizirconium [dimer (Ⅰ)] and tetrakis (methylcyclopentadienyl) bis (p-tolyl)-μ-oxo-dizirconium [dimer (II)]. Both of them belong to monoclinic system and possess the same spacegroup C_2~5h- 2_1/a. The cell dimer (Ⅰ) containing four molecules is defined by a=19.122A,b=16.319A, c = 9.296A, β= 92°1′; the cell dimer (Ⅱ) containing two molecules is defined bya = 20.076A, b = 8.205A, c = 10.016A, β= 104°41′. The important difference of molecular configurations between the two dimers lies in thatthe dimer (Ⅰ) has no symmetry center and its Zn-O-Zr oxo-bridge presents a slightly bentconfiguration while the dimer (Ⅱ) takes the oxgen atom as a symmetry center and its oxo-bridge present linear linkage. In accordance with the above-mentioned molecular configuration, steric effect and elec-tronic structure have been further discussed.
This paper reports the crystal and molecular structures of tetrakis (cyclopentadienyl) bis (o-tolyl) -μ-oxo-dizirconium [dimer (I)] and tetrakis (methylcyclopentadienyl) bis (p- tolyl) -μ- oxo-dizirconium [dimer (II)]. Both of them belong to monoclinic system and possess the same space group C_2-5h-2_1 / a. The cell dimer (I) contains four molecules which are defined by a = 19.122A, b = 16.319A, c = 9.296 A, β = 92 ° 1 ’; the important difference of the molecular configurations between the two dimers lies in that the dimer (I) has no symmetry center and its Zn-O-Zr oxo-bridge presents a slightly bent configuration while the dimer (II) takes the oxgen atom as a symmetry center and its oxo-bridge present linear linkage. In accordance with the above-mentioned molecular configuration, steric effect and elec-tronic structure have been further discussed.