Alkali Metal Cation−π Interactions Stabilized Solely by [M{N(SiMe3)2}3]-Anions (M = Mg or Zn): The Competing Influence of Alkali Metal···C(Me) Agostic Interactions
Forbes, Glenn C.; Kennedy, Alan R.; Mulvey, Robert E.; Roberts, Brett A.; Rowlings, René B.; Organometallics 21 (2002) 5115–; doi:10.1021/om020596u

data_4077111
_publ_section_title
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 Alkali Metal Cation&#x2212;\p Interactions Stabilized Solely by
 [M{N(SiMe3)2}3]-Anions (M = Mg or Zn):&#x00A0; The Competing Influence of
 Alkali Metal&#x00B7;&#x00B7;&#x00B7;C(Me) Agostic Interactions
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_journal_issue                   23
_journal_name_full               Organometallics
_journal_page_first              5115
_journal_paper_doi               10.1021/om020596u
_journal_volume                  21
_journal_year                    2002
_chemical_formula_sum            'C39 H78 Mg N3 Rb Si6'
_chemical_formula_weight         867.36
_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                 110.1360(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.8594(4)
_cell_length_b                   14.4985(3)
_cell_length_c                   20.0470(5)
_cell_measurement_reflns_used    232730
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      27.49
_cell_measurement_theta_min      1.01
_cell_volume                     5146.5(2)
_computing_data_collection       'Denzo and Collect'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.945
_diffrn_measured_fraction_theta_max 0.945
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       'phi and 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  0.0867
_diffrn_reflns_av_sigmaI/netI    0.0677
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            37157
_diffrn_reflns_theta_full        26.50
_diffrn_reflns_theta_max         26.50
_diffrn_reflns_theta_min         1.83
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.141
_exptl_absorpt_correction_T_max  0.714
_exptl_absorpt_correction_T_min  0.417
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'sortav - Blessing 1995'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.119
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             1864
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.55
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.840
_refine_diff_density_min         -0.772
_refine_diff_density_rms         0.080
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.110
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     470
_refine_ls_number_reflns         10481
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.110
_refine_ls_R_factor_all          0.0810
_refine_ls_R_factor_gt           0.0588
_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^)+(0.0413P)^2^+8.6727P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1304
_refine_ls_wR_factor_ref         0.1424
_reflns_number_gt                8246
_reflns_number_total             10481
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om020596u.cif
_cod_data_source_block           grem53ab
_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^)+(0.0413P)^2^+8.6727P] 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^)+(0.0413P)^2^+8.6727P] 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      P21/n
_cod_database_code               4077111