Synthesis of the mixed lithium‒magnesium, mixed amide (R,R/S,S)-[{LiMg(TMP)[CH2Si(Me)2N(SiMe3)]}2]: a conformationally-locked structure of five fused rings inducing two stereogenic nitrogen centres
Barr, Lorna; Kennedy, Alan R.; MacLellan, Jonathan G.; Moir, Jennifer H.; Mulvey, Robert E.; Rodger, Philip J. A.; Chemical Communications  (2000) 1757–; doi:10.1039/b004317f

data_7111020
_publ_section_title
;
 Synthesis of the mixed lithium--magnesium, mixed amide
 (R,R/S,S)-[{LiMg(TMP)[CH2Si(Me)2N(SiMe3)]}2]: a conformationally-locked
 structure of five fused rings inducing two stereogenic nitrogen centres
;
_journal_issue                   18
_journal_name_full               'Chemical Communications'
_journal_page_first              1757
_journal_paper_doi               10.1039/b004317f
_journal_year                    2000
_chemical_formula_sum            'C30 H70 Li2 Mg2 N4 Si4'
_chemical_formula_weight         661.76
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.6682(2)
_cell_length_b                   16.8825(4)
_cell_length_c                   20.9980(4)
_cell_measurement_temperature    150(2)
_cell_volume                     4136.36(14)
_computing_cell_refinement       'DENZO and COLLECT'
_computing_data_collection
;
' DENZO (Otwinowski and Minor, 1997'
' COLLECT (Hooft, 1998)'
;
_computing_data_reduction        'DENZO and COLLECT'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 9.091
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Enraf Nonius KappaCCD area detector'
_diffrn_measurement_method       'Phi and Omega scans to fill Ewald sphere'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enraf Nonius FR591 rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0786
_diffrn_reflns_av_sigmaI/netI    0.0923
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            30186
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         1.94
_exptl_absorpt_coefficient_mu    0.197
_exptl_absorpt_correction_T_max  0.9863
_exptl_absorpt_correction_T_min  0.9431
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 Using multiple and symmetry-related data measurements via the program
 SORTAV
  See R.H. Blessing, Acta Crysta (1995), A51, 33-38
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.063
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             1456
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.318
_refine_diff_density_min         -0.306
_refine_diff_density_rms         0.060
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.04(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.982
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     414
_refine_ls_number_reflns         9097
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.982
_refine_ls_R_factor_all          0.0979
_refine_ls_R_factor_gt           0.0504
_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^)+(0.0561P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1020
_refine_ls_wR_factor_ref         0.1181
_reflns_number_gt                6153
_reflns_number_total             9097
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b004317fsup1.cif
_cod_data_source_block           sot5
_cod_depositor_comments
;
The following automatic conversions were performed:

'_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 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0561P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0561P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      Pna21
_cod_database_code               7111020