Unusual Si–H Bond Activation and Formation of Cationic Scandium Amide Complexes from a Mono(amidinate)-Ligated Scandium Bis(silylamide) Complex and Their Performance in Isoprene Polymerization
Chen, Fei; Fan, Shimin; Wang, Yibin; Chen, Jue; Luo, Yunjie; Organometallics 31 (2012) 3730–; doi:10.1021/om3002119

data_4078287
_publ_section_title
;
 Unusual Si--H Bond Activation and Formation of Cationic Scandium Amide
 Complexes from a Mono(amidinate)-Ligated Scandium Bis(silylamide) Complex
 and Their Performance in Isoprene Polymerization
;
_journal_issue                   9
_journal_name_full               Organometallics
_journal_page_first              3730
_journal_paper_doi               10.1021/om3002119
_journal_volume                  31
_journal_year                    2012
_chemical_formula_moiety         'C39 H67 N4 Sc Si4'
_chemical_formula_sum            'C39 H67 N4 Sc Si4'
_chemical_formula_weight         749.29
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      15
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 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                 109.737(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   40.703(5)
_cell_length_b                   18.366(2)
_cell_length_c                   13.4760(17)
_cell_measurement_reflns_used    12650
_cell_measurement_temperature    223(2)
_cell_measurement_theta_max      27.6
_cell_measurement_theta_min      3.0
_cell_volume                     9482(2)
_computing_cell_refinement       CrystalClear
_computing_data_collection       CrystalClear
_computing_data_reduction        CrystalStructure
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      223(2)
_diffrn_detector_area_resol_mean 14.63
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Rigaku Saturn'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.0508
_diffrn_reflns_av_sigmaI/netI    0.0645
_diffrn_reflns_limit_h_max       48
_diffrn_reflns_limit_h_min       -49
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            23876
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         3.02
_exptl_absorpt_coefficient_mu    0.284
_exptl_absorpt_correction_T_max  0.973
_exptl_absorpt_correction_T_min  0.690
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.050
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             3248
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.58
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.851
_refine_diff_density_min         -0.740
_refine_diff_density_rms         0.052
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.141
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     468
_refine_ls_number_reflns         8801
_refine_ls_number_restraints     4
_refine_ls_restrained_S_all      1.141
_refine_ls_R_factor_all          0.1186
_refine_ls_R_factor_gt           0.0846
_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^)+(0.0676P)^2^+14.1126P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1782
_refine_ls_wR_factor_ref         0.1960
_reflns_number_gt                6363
_reflns_number_total             8801
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om3002119_si_003.cif
_cod_data_source_block           shelxl
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               4078287