Dinitrogen Activation and Hydrogenation by C<sub>5</sub>Me<sub>4</sub>SiMe<sub>3</sub>-Ligated Di- and Trinuclear Chromium Hydride Complexes.
Shima, Takanori; Yang, Jimin; Luo, Gen; Luo, Yi; Hou, Zhaomin; Journal of the American Chemical Society  (2020) –; doi:10.1021/jacs.0c02939

data_4134834
_publ_section_title
;
 Dinitrogen Activation and Hydrogenation by
 C<sub>5</sub>Me<sub>4</sub>SiMe<sub>3</sub>-Ligated Di- and Trinuclear
 Chromium Hydride Complexes.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.0c02939
_journal_year                    2020
_chemical_formula_moiety         'C48 H86 Cr4 N2 Si4, C6 H6'
_chemical_formula_sum            'C54 H92 Cr4 N2 Si4'
_chemical_formula_weight         1089.65
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_audit_creation_date             2019-02-18
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_cell_angle_alpha                90
_cell_angle_beta                 108.4378(13)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   24.1370(9)
_cell_length_b                   11.8989(4)
_cell_length_c                   21.1755(8)
_cell_measurement_reflns_used    9980
_cell_measurement_temperature    173.15
_cell_measurement_theta_max      24.97
_cell_measurement_theta_min      2.31
_cell_volume                     5769.5(4)
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      173.15
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'CMOS area detector'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0725
_diffrn_reflns_av_unetI/netI     0.0338
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_h_min       -28
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            48679
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.081
_diffrn_reflns_theta_max         25.081
_diffrn_reflns_theta_min         2.235
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.851
_exptl_absorpt_correction_T_max  0.7452
_exptl_absorpt_correction_T_min  0.7067
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            black
_exptl_crystal_colour_primary    black
_exptl_crystal_density_diffrn    1.254
_exptl_crystal_description       block
_exptl_crystal_F_000             2328
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.334
_refine_diff_density_min         -0.264
_refine_diff_density_rms         0.055
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.031
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     312
_refine_ls_number_reflns         5111
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.031
_refine_ls_R_factor_all          0.0504
_refine_ls_R_factor_gt           0.0322
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0320P)^2^+9.0235P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0716
_refine_ls_wR_factor_ref         0.0784
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4046
_reflns_number_total             5111
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja0c02939_si_003.cif
_cod_data_source_block           Complex6_26141ts
_cod_database_code               4134834
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_max   0.959
_shelx_estimated_absorpt_t_min   0.727
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2. Others
 Fixed Sof: N1(0.56) N2(0.44) H1(0.44) H2(0.56)
3.a Everything fixed:
 H1, H2
3.b Aromatic/amide H refined with riding coordinates:
 C25(H25), C26(H26), C27(H27)
3.c Idealised Me refined as rotating group:
 C6(H6A,H6B,H6C), C7(H7A,H7B,H7C), C8(H8A,H8B,H8C), C9(H9A,H9B,H9C), C10(H10A,
 H10B,H10C), C11(H11A,H11B,H11C), C12(H12A,H12B,H12C), C18(H18A,H18B,H18C),
 C19(H19A,H19B,H19C), C20(H20A,H20B,H20C), C21(H21A,H21B,H21C), C22(H22A,H22B,
 H22C), C23(H23A,H23B,H23C), C24(H24A,H24B,H24C)
;
_shelx_res_checksum              71796
_shelx_hkl_checksum              44079
_olex2_submission_special_instructions 'No special instructions were received'