Synthesis, Characterization, and Solution Lability of N-Heterocyclic Carbene Adducts of the Heavier Group 2 Bis(trimethylsilyl)amides
Barrett, Anthony G. M.; Crimmin, Mark R.; Hill, Michael S.; Kociok-Köhn, Gabriele; MacDougall, Dugald J.; Mahon, Mary F.; Procopiou, Panayiotis A.; Organometallics 27 (2008) 3939–; doi:10.1021/om800299j

data_4071660
_publ_section_title
;
 Synthesis, Characterization, and Solution Lability of N-Heterocyclic
 Carbene Adducts of the Heavier Group 2 Bis(trimethylsilyl)amides
;
_journal_issue                   15
_journal_name_full               Organometallics
_journal_page_first              3939
_journal_paper_doi               10.1021/om800299j
_journal_volume                  27
_journal_year                    2008
_chemical_formula_sum            'C48 H66 Ca N2 O2 P2 Si4'
_chemical_formula_weight         917.41
_chemical_name_systematic
;
 ?
;
_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                 102.240(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.8940(1)
_cell_length_b                   20.9365(2)
_cell_length_c                   21.9023(2)
_cell_measurement_reflns_used    83488
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      2.910
_cell_volume                     5330.10(9)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Bruker AXS BV, 1997-2004)'
_computing_data_reduction
'Denzo & Scalepack (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'ORTEX (P.McArdle, 1995)'
_computing_publication_material  'SHELXL-97/2 (Sheldrick,1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       '423 1.4 degree images with \f and \w scans'
_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  0.0528
_diffrn_reflns_av_sigmaI/netI    0.0325
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       27
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            104722
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.57
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.304
_exptl_absorpt_correction_T_max  0.94
_exptl_absorpt_correction_T_min  0.89
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan from symmetry-related measurements 
 Sortav (Blessing 1995)
;
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.143
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Parallelepiped
_exptl_crystal_F_000             1960
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.282
_refine_diff_density_min         -0.341
_refine_diff_density_rms         0.063
_refine_ls_extinction_coef       0.0009(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     545
_refine_ls_number_reflns         12205
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0514
_refine_ls_R_factor_gt           0.0354
_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^)+(0.0369P)^2^+2.2167P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0811
_refine_ls_wR_factor_ref         0.0890
_reflns_number_gt                9778
_reflns_number_total             12205
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om800299j-file004.cif
_cod_data_source_block           k08msh5
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Multi-Scan'
changed to 'multi-scan' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        5330.10(8)
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               4071660