Alternating and Random Copolymerization of Isoprene and Ethylene Catalyzed by Cationic Half-Sandwich Scandium Alkyls
Xiaofang Li; Masayoshi Nishiura; Lihong Hu; Kyouichi Mori; Zhaomin Hou; Journal of the American Chemical Society 131 (2009) 13870–13882; doi:10.1021/ja9056213

data_4105074
_publ_section_title
;
 Alternating and Random Copolymerization of Isoprene and Ethylene
 Catalyzed by Cationic Half-Sandwich Scandium Alkyls
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              13870
_journal_page_last               13882
_journal_paper_doi               10.1021/ja9056213
_journal_volume                  131
_journal_year                    2009
_chemical_formula_sum            'C18 H37 O Sc Si2'
_chemical_formula_weight         370.62
_chemical_name_common            (MeC5H4)Sc(CH2SiMe3)2(thf)
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 94.6570(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.6699(8)
_cell_length_b                   10.8800(9)
_cell_length_c                   21.3864(17)
_cell_measurement_temperature    173(2)
_cell_volume                     2242.6(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SMART'
_computing_molecular_graphics    'ORTEP-III (Farrugia, 1997)'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.985
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0216
_diffrn_reflns_av_sigmaI/netI    0.0345
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            13680
_diffrn_reflns_theta_full        27.55
_diffrn_reflns_theta_max         27.55
_diffrn_reflns_theta_min         1.91
_exptl_absorpt_coefficient_mu    0.436
_exptl_absorpt_correction_T_max  0.9281
_exptl_absorpt_correction_T_min  0.7819
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SADABS'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.098
_exptl_crystal_description       plate
_exptl_crystal_F_000             808
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.606
_refine_diff_density_min         -0.366
_refine_diff_density_rms         0.052
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.003
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     206
_refine_ls_number_reflns         5096
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.003
_refine_ls_R_factor_all          0.0488
_refine_ls_R_factor_gt           0.0375
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0580P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0970
_refine_ls_wR_factor_ref         0.1012
_reflns_number_gt                4023
_reflns_number_total             5096
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja9056213_si_001_2.cif
_cod_data_source_block           2
_cod_database_code               4105074