Direct Synthesis of Ligand-Based Radicals by the Addition of Bipyridine to Chromium(II) Compounds
Wen Zhou; Addison N. Desnoyer; James A. Bailey; Brian O. Patrick; Kevin M. Smith; Inorganic Chemistry 52 (2013) 2271–2273; doi:10.1021/ic302590g

data_4334028
_publ_section_title
;
 Direct Synthesis of Ligand-Based Radicals by the Addition of Bipyridine
 to Chromium(II) Compounds
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              2271
_journal_page_last               2273
_journal_paper_doi               10.1021/ic302590g
_journal_volume                  52
_journal_year                    2013
_chemical_formula_sum            'C22 H44 Cr N4 Si4'
_chemical_formula_weight         528.97
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 99.3440(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   14.8670(2)
_cell_length_b                   22.9622(3)
_cell_length_c                   17.5517(2)
_cell_measurement_reflns_used    9966
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      29.9355
_cell_measurement_theta_min      2.352
_cell_volume                     5912.28(13)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_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  0.0435
_diffrn_reflns_av_sigmaI/netI    0.0533
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       32
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            64040
_diffrn_reflns_theta_full        30.06
_diffrn_reflns_theta_max         30.06
_diffrn_reflns_theta_min         1.89
_exptl_absorpt_coefficient_mu    0.565
_exptl_absorpt_correction_T_max  0.893
_exptl_absorpt_correction_T_min  0.827
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    1.189
_exptl_crystal_description       prism
_exptl_crystal_F_000             2272
_exptl_crystal_size_max          0.350
_exptl_crystal_size_mid          0.250
_exptl_crystal_size_min          0.200
_refine_diff_density_max         0.555
_refine_diff_density_min         -0.348
_refine_diff_density_rms         0.075
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.008
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     559
_refine_ls_number_reflns         17276
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.008
_refine_ls_R_factor_all          0.0803
_refine_ls_R_factor_gt           0.0415
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0446P)^2^+2.5237P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0915
_refine_ls_wR_factor_ref         0.1066
_reflns_number_gt                11815
_reflns_number_total             17276
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            ic302590g_si_002_5.cif
_cod_data_source_block           4_Cr_bis_NSi2Me6_Bpy
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4334028