N-Heterocyclic carbene stabilized adducts of alkyl magnesium amide, bisalkyl magnesium and Grignard reagents: trapping oligomeric organo s-block fragments with NHCs.
Kennedy, Alan R.; Mulvey, Robert E.; Robertson, Stuart D.; Dalton transactions (Cambridge, England : 2003) 39 (2010) 9091–9099; doi:10.1039/c0dt00693a

data_7026767
_publ_section_title
;
 N-Heterocyclic carbene stabilized adducts of alkyl magnesium amide,
 bisalkyl magnesium and Grignard reagents: trapping oligomeric organo
 s-block fragments with NHCs.
;
_journal_issue                   38
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              9091
_journal_page_last               9099
_journal_paper_doi               10.1039/c0dt00693a
_journal_volume                  39
_journal_year                    2010
_chemical_formula_sum            'C86 H144 Mg4 N4'
_chemical_formula_weight         1331.29
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 91.904(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   17.5342(11)
_cell_length_b                   13.7504(8)
_cell_length_c                   17.7758(12)
_cell_measurement_reflns_used    6295
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      73.51
_cell_measurement_theta_min      3.19
_cell_volume                     4283.4(5)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.983
_diffrn_measured_fraction_theta_max 0.983
_diffrn_measurement_device_type  'Oxford Diffraction Gemini S'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54180
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0982
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            21729
_diffrn_reflns_theta_full        64.99
_diffrn_reflns_theta_max         64.99
_diffrn_reflns_theta_min         3.48
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.698
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.77490
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.34d (release 27-02-2009 CrysAlis171 .NET)
(compiled Feb 27 2009,15:38:38)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.032
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1472
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.401
_refine_diff_density_min         -0.294
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.882
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     484
_refine_ls_number_reflns         21729
_refine_ls_number_restraints     12
_refine_ls_restrained_S_all      0.882
_refine_ls_R_factor_all          0.1175
_refine_ls_R_factor_gt           0.0638
_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^)+(0.0979P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1561
_refine_ls_wR_factor_ref         0.1760
_reflns_number_gt                11576
_reflns_number_total             21729
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c0dt00693a.txt
_cod_data_source_block           sdr918
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               7026767