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_4077109
_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
;
_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            'C34 H74 K Mg N3 Si6'
_chemical_formula_weight         756.91
_chemical_name_systematic
; 
 ? 
;
_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                84.1720(10)
_cell_angle_beta                 73.6380(10)
_cell_angle_gamma                82.401(2)
_cell_formula_units_Z            2
_cell_length_a                   11.6299(3)
_cell_length_b                   12.2471(3)
_cell_length_c                   17.4976(5)
_cell_measurement_reflns_used    all
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      28.00
_cell_measurement_theta_min      1.22
_cell_volume                     2364.87(11)
_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 0.923
_diffrn_measured_fraction_theta_max 0.893
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       'omega and phi scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0202
_diffrn_reflns_av_sigmaI/netI    0.0476
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            14302
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         28.00
_diffrn_reflns_theta_min         1.22
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.302
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.063
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       chip
_exptl_crystal_F_000             828
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.298
_refine_diff_density_min         -0.235
_refine_diff_density_rms         0.046
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.019
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     461
_refine_ls_number_reflns         10204
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.019
_refine_ls_R_factor_all          0.0504
_refine_ls_R_factor_gt           0.0362
_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^)+(0.0106P)^2^+1.2784P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0726
_refine_ls_wR_factor_ref         0.0778
_reflns_number_gt                8372
_reflns_number_total             10204
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om020596u.cif
_cod_data_source_block           px
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0106P)^2^+1.2784P] 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^)+(0.0106P)^2^+1.2784P] 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      P-1
_cod_database_code               4077109