The addition of Grignard reagents to carbodiimides. The synthesis, structure and potential utilization of magnesium amidinates.
Chlupatý, Tomáš; Bílek, Michal; Merna, Jan; Brus, Jiří; RůŽičková, Zdeňka; Strassner, Thomas; RůŽička, Aleš; Dalton transactions (Cambridge, England : 2003) 48 (2019) 5335–5342; doi:10.1039/c9dt00880b

data_7049477
_publ_section_title
;
 The addition of Grignard reagents to carbodiimides. The synthesis,
 structure and potential utilization of magnesium amidinates.
;
_journal_issue                   16
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              5335
_journal_page_last               5342
_journal_paper_doi               10.1039/c9dt00880b
_journal_volume                  48
_journal_year                    2019
_chemical_formula_moiety         'C42 H80 Mg2 N4'
_chemical_formula_sum            'C42 H80 Mg2 N4'
_chemical_formula_weight         689.72
_space_group_IT_number           29
_space_group_name_Hall           'P 2c -2ac'
_space_group_name_H-M_alt        'P c a 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2019-02-21 deposited with the CCDC.    2019-03-26 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   15.2640(11)
_cell_length_b                   16.4970(15)
_cell_length_c                   16.9821(19)
_cell_measurement_reflns_used    22719
_cell_measurement_temperature    150(1)
_cell_measurement_theta_max      27
_cell_measurement_theta_min      1
_cell_volume                     4276.3(7)
_computing_cell_refinement       'COLLECT and DENZO'
_computing_data_collection
'COLLECT (Hooft, 1998) and DENZO (Otwinowski & Minor, 1997)'
_computing_data_reduction        'COLLECT and DENZO'
_computing_molecular_graphics    'PLATON (Spek, 2003)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      150(1)
_diffrn_detector_area_resol_mean 9.091
_diffrn_measured_fraction_theta_full 0.980
_diffrn_measured_fraction_theta_max 0.980
_diffrn_measurement_device_type  'Bruker Nonius KappaCCD area detector'
_diffrn_measurement_method       '\f and \w scans to fill the Ewald sphere'
_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  0.0630
_diffrn_reflns_av_sigmaI/netI    0.0518
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            22670
_diffrn_reflns_theta_full        25.80
_diffrn_reflns_theta_max         25.80
_diffrn_reflns_theta_min         1.82
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_T_max  0.982
_exptl_absorpt_correction_T_min  0.972
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details
;
Gaussian integration (Coppens, 1970)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.071
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1536
_exptl_crystal_size_max          0.41
_exptl_crystal_size_mid          0.34
_exptl_crystal_size_min          0.30
_refine_diff_density_max         1.193
_refine_diff_density_min         -0.370
_refine_diff_density_rms         0.079
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.3(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.162
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     433
_refine_ls_number_reflns         8033
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.162
_refine_ls_R_factor_all          0.0982
_refine_ls_R_factor_gt           0.0670
_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^)+(0.0680P)^2^+4.4682P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1534
_refine_ls_wR_factor_ref         0.1814
_reflns_number_gt                6215
_reflns_number_total             8033
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c9dt00880b2.cif
_cod_data_source_block           1
_cod_depositor_comments
'Adding full bibliography for 7049472--7049477.cif.'
_cod_database_code               7049477