A Novel Group of Alkaline Earth Metal Amides: Syntheses and Characterization of M[N(2,6-iPr2C6H3)(SiMe3)]2(THF)2 (M = Mg, Ca, Sr, Ba) and the Linear, Two-Coordinate Mg[N(2,6-iPr2C6H3)(SiMe3)]2
Wilda Vargas; Ulrich Englich; Karin Ruhlandt-Senge; Inorganic Chemistry 41 (2002) 5602–5608; doi:10.1021/ic0203668

data_4318680
_publ_section_title
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 A Novel Group of Alkaline Earth Metal Amides: Syntheses and
 Characterization of M[N(2,6-iPr2C6H3)(SiMe3)]2(THF)2 (M = Mg, Ca, Sr, Ba)
 and the Linear, Two-Coordinate Mg[N(2,6-iPr2C6H3)(SiMe3)]2
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_journal_name_full               'Inorganic Chemistry'
_journal_page_first              5602
_journal_page_last               5608
_journal_paper_doi               10.1021/ic0203668
_journal_volume                  41
_journal_year                    2002
_chemical_formula_sum            'C38 H68 Ca N2 O2 Si2'
_chemical_formula_weight         681.20
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                73.5730(10)
_cell_angle_beta                 78.6320(10)
_cell_angle_gamma                89.6210(10)
_cell_formula_units_Z            4
_cell_length_a                   9.70740(10)
_cell_length_b                   20.9466(4)
_cell_length_c                   21.6242(3)
_cell_measurement_reflns_used    6745
_cell_measurement_temperature    90(2)
_cell_volume                     4129.13(11)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      90(2)
_diffrn_measured_fraction_theta_full 0.933
_diffrn_measured_fraction_theta_max 0.933
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'omega 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  0.0417
_diffrn_reflns_av_sigmaI/netI    0.0662
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       27
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            36080
_diffrn_reflns_theta_full        28.36
_diffrn_reflns_theta_max         28.36
_diffrn_reflns_theta_min         1.00
_diffrn_standards_decay_%        No
_exptl_absorpt_coefficient_mu    0.242
_exptl_absorpt_correction_T_max  0.9809
_exptl_absorpt_correction_T_min  0.8302
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Blessing, Acta Cryst. (1995) A51 33-38.'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.096
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1496
_exptl_crystal_size_max          0.80
_exptl_crystal_size_mid          0.36
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.834
_refine_diff_density_min         -0.538
_refine_diff_density_rms         0.069
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.016
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     811
_refine_ls_number_reflns         19229
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.016
_refine_ls_R_factor_all          0.0902
_refine_ls_R_factor_gt           0.0533
_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^)+(0.0664P)^2^+1.8107P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1210
_refine_ls_wR_factor_ref         0.1376
_reflns_number_gt                13302
_reflns_number_total             19229
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic0203668_3.cif
_cod_data_source_block           wvg006
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to the built-in table from CIF Core dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
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_cod_database_code               4318680