Monomeric Three- and Four-Coordinate Magnesium Amides
Jennifer L. Sebestl; T. Timothy Nadasdi; Mary Jane Heeg; Charles H. Winter; Inorganic Chemistry 37 (1998) 1289–1294; doi:10.1021/ic970905m

data_4322709
_publ_section_title
;
 Monomeric Three- and Four-Coordinate Magnesium Amides
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_journal_name_full               'Inorganic Chemistry'
_journal_page_first              1289
_journal_page_last               1294
_journal_paper_doi               10.1021/ic970905m
_journal_volume                  37
_journal_year                    1998
_chemical_formula_sum            'C18 H43 Mg N3 Si4'
_chemical_formula_weight         438.22
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   18.4536(14)
_cell_length_b                   15.2326(9)
_cell_length_c                   20.6143(15)
_cell_measurement_reflns_used    4553
_cell_measurement_temperature    295(2)
_cell_volume                     5794.6(7)
_computing_cell_refinement       'Siemens SAINT'
_computing_data_collection       'Siemens SMART'
_computing_data_reduction        'Siemens SAINT'
_computing_molecular_graphics    SHELXTL-plus
_computing_publication_material  SHELXL-93
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295(2)
_diffrn_measurement_device       'Siemens P4/CCD'
_diffrn_measurement_method       'SMART CCD'
_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  0.130
_diffrn_reflns_av_sigmaI/netI    0.1509
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            29445
_diffrn_reflns_theta_max         28.31
_diffrn_reflns_theta_min         1.98
_diffrn_standards_interval_time  21600
_diffrn_standards_number         '50 frames'
_exptl_absorpt_coefficient_mu    0.234
_exptl_absorpt_correction_T_max  0.935
_exptl_absorpt_correction_T_min  0.593
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.005
_exptl_crystal_description       Irregular
_exptl_crystal_F_000             1920
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.26
_refine_diff_density_max         0.334
_refine_diff_density_min         -0.232
_refine_diff_density_rms         0.063
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   0.940
_refine_ls_goodness_of_fit_obs   1.178
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     248
_refine_ls_number_reflns         6477
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.940
_refine_ls_restrained_S_obs      1.178
_refine_ls_R_factor_all          0.2506
_refine_ls_R_factor_obs          0.0842
_refine_ls_shift/esd_max         -0.046
_refine_ls_shift/esd_mean        0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1108P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.2411
_refine_ls_wR_factor_obs         0.1784
_reflns_number_observed          2333
_reflns_number_total             6477
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            ic970905m_4.cif
_cod_data_source_block           pico(6)
_cod_depositor_comments
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The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.1108P)^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^)+(0.1108P)^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 
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_cod_database_code               4322709