A bis(amido) ligand set that supports two-coordinate chromium in the +1, +2, and +3 oxidation states
Irene C. Cai; Michael I. Lipschutz; T. Don Tilley; Chem.Commun. 50 (2014) 13062–; doi:10.1039/C4cc06615D

data_7115840
_publ_section_title
;
 A bis(amido) ligand set that supports two-coordinate chromium in the +1,
 +2, and +3 oxidation states
;
_journal_name_full               Chem.Commun.
_journal_page_first              13062
_journal_paper_doi               10.1039/C4cc06615D
_journal_volume                  50
_journal_year                    2014
_chemical_formula_sum            'C42 H76 Cr I N2 Si2'
_chemical_formula_weight         844.13
_chemical_name_systematic
;
 ?
;
_chemical_properties_physical    Air-sensitive
_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                 90.515(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.0285(5)
_cell_length_b                   23.0870(10)
_cell_length_c                   17.0353(7)
_cell_measurement_reflns_used    9883
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      25.34
_cell_measurement_theta_min      2.36
_cell_volume                     4337.3(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    ORTEP32
_computing_publication_material  WinGX
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    SIR97
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.366
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  'QUAZAR multilayer mirrors'
_diffrn_radiation_source         'microfocus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0808
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       27
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            7912
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.43
_diffrn_reflns_theta_min         1.76
_exptl_absorpt_coefficient_mu    1.061
_exptl_absorpt_correction_T_max  0.9895
_exptl_absorpt_correction_T_min  0.9588
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   TWINABS
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.293
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1788
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: pentane'
_exptl_crystal_size_max          0.04
_exptl_crystal_size_mid          0.03
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.977
_refine_diff_density_min         -0.583
_refine_diff_density_rms         0.109
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     453
_refine_ls_number_reflns         7912
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.0854
_refine_ls_R_factor_gt           0.0523
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0188P)^2^+16.0774P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0978
_refine_ls_wR_factor_ref         0.1047
_reflns_number_gt                5685
_reflns_number_total             7912
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4cc06615d2.cif
_cod_data_source_block           shelxl_c
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7115840