Living Ziegler-Natta Polymerization by Early Transition Metals: Synthesis and Evaluation of Cationic Zirconium Alkyl Complexes Bearing β-Hydrogens as Models for Propagating Centers
Matthew B. Harney; Richard J. Keaton; James C. Fettinger; Lawrence R. Sita; Journal of the American Chemical Society 128 (2006) 3420–3432; doi:10.1021/ja057866v

data_4110473
_publ_section_title
;
 Living Ziegler-Natta Polymerization by Early Transition Metals: Synthesis
 and Evaluation of Cationic Zirconium Alkyl Complexes Bearing \b-Hydrogens
 as Models for Propagating Centers
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              3420
_journal_page_last               3432
_journal_paper_doi               10.1021/ja057866v
_journal_volume                  128
_journal_year                    2006
_chemical_formula_sum            'C21 H40 N2 Zr'
_chemical_formula_weight         411.77
_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                 91.8790(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.0417(5)
_cell_length_b                   16.1399(8)
_cell_length_c                   15.5233(8)
_cell_measurement_reflns_used    8058
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      27.47
_cell_measurement_theta_min      2.52
_cell_volume                     2264.1(2)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      193(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_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  0.0311
_diffrn_reflns_av_sigmaI/netI    0.0193
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            34520
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.52
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.490
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.81622
_exptl_absorpt_correction_type   'empirical, SADABS'
_exptl_crystal_colour            Orange
_exptl_crystal_density_diffrn    1.208
_exptl_crystal_density_meas      0
_exptl_crystal_description       Block
_exptl_crystal_F_000             880
_exptl_crystal_size_max          0.382
_exptl_crystal_size_mid          0.184
_exptl_crystal_size_min          0.170
_refine_diff_density_max         2.820
_refine_diff_density_min         -0.527
_refine_diff_density_rms         0.104
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.100
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     279
_refine_ls_number_reflns         5183
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.100
_refine_ls_R_factor_all          0.0566
_refine_ls_R_factor_gt           0.0473
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0788P)^2^+1.7272P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1273
_refine_ls_wR_factor_ref         0.1333
_reflns_number_gt                4393
_reflns_number_total             5183
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja057866vsi20051119_012302.cif
_cod_data_source_block           Cp*Zr(Me)(Et)[N(tBu)C(Me)N(Et)]
_cod_database_code               4110473