Exploring Chromium(III)-Alkyl Bond Homolysis with CpCr[(ArNCMe)2CH](R) Complexes
K. Cory MacLeod; Julia L. Conway; Brian O. Patrick; Kevin M. Smith; Journal of the American Chemical Society 132 (2010) 17325–17334; doi:10.1021/ja1083392

data_4103632
_publ_section_title
;
 Exploring Chromium(III)-Alkyl Bond Homolysis with CpCr[(ArNCMe)2CH](R)
 Complexes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              17325
_journal_page_last               17334
_journal_paper_doi               10.1021/ja1083392
_journal_volume                  132
_journal_year                    2010
_chemical_formula_sum            'C38 H57 Cr N2 Si'
_chemical_formula_weight         621.95
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 90.8350(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.7572(4)
_cell_length_b                   10.4447(2)
_cell_length_c                   19.8127(4)
_cell_measurement_reflns_used    9635
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      28.000
_cell_measurement_theta_min      2.204
_cell_volume                     3467.33(13)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker X8 APEX II'
_diffrn_measurement_method       'area detector'
_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  0.0273
_diffrn_reflns_av_sigmaI/netI    0.0260
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            63412
_diffrn_reflns_theta_full        28.04
_diffrn_reflns_theta_max         28.04
_diffrn_reflns_theta_min         2.06
_exptl_absorpt_coefficient_mu    0.39
_exptl_absorpt_correction_T_max  0.943
_exptl_absorpt_correction_T_min  0.844
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    1.191
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       tablet
_exptl_crystal_F_000             1348
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.55
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.332
_refine_diff_density_min         -0.324
_refine_diff_density_rms         0.045
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.677(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.019
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     759
_refine_ls_number_reflns         16785
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.019
_refine_ls_R_factor_all          0.0401
_refine_ls_R_factor_gt           0.0360
_refine_ls_shift/su_max          0.011
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0441P)^2^+2.1367P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0895
_refine_ls_wR_factor_ref         0.0926
_reflns_number_gt                15651
_reflns_number_total             16785
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja1083392_si_002_05.cif
_cod_data_source_block           4a_Dpp_CH2SiMe3
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               4103632