Unexpected Formation of Ga4C2H4Heteroadamantane Cages by the Reaction of Carbon-Bridged Bis(dichlorogallium) Compounds withtert-Butyllithium
Uhl, Werner; Kovert, Dirk; Zemke, Sarina; Hepp, Alexander; Organometallics 30 (2011) 4736–; doi:10.1021/om200573g

data_4065122
_publ_section_exptl_refinement
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The weak completeness of X-ray data is a well-known phenomenon for these 
X-ray machines and particularly distinct for copper radiation. It has 
already been discussed in the respective internet forum. The problematic
measurements were partially carried out with copper radiation. The 
completeness in such measurements is generally even lower than those with
Mo radiation, particularly when the crystal symmetry (redundancy within 
the measurement) is low (triclinic in our case). Furthermore, the problem 
is aggravated when the measurement is carried out to angles in 2 theta 
well above the required minimum of 135 degrees. We always carry our Cu 
measurements to the physical maximum of 150&#x00B0;. When tested, our data 
showed a substantial increase in completeness when reduced to the 
required minimum in 2 theta. Since we are primarily interested in maximum 
crystallographic information, we used the complete measurement for the 
structure determination. 
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_publ_section_title
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 Unexpected Formation of Ga4C2H4Heteroadamantane Cages by the Reaction of
 Carbon-Bridged Bis(dichlorogallium) Compounds withtert-Butyllithium
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_journal_issue                   17
_journal_name_full               Organometallics
_journal_page_first              4736
_journal_paper_doi               10.1021/om200573g
_journal_volume                  30
_journal_year                    2011
_chemical_formula_sum            'C40 H76 Ga4 Si2'
_chemical_formula_weight         892.07
_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                80.4510(10)
_cell_angle_beta                 74.6750(10)
_cell_angle_gamma                68.6740(10)
_cell_formula_units_Z            2
_cell_length_a                   11.3848(2)
_cell_length_b                   12.0924(2)
_cell_length_c                   18.4019(3)
_cell_measurement_reflns_used    4771
_cell_measurement_temperature    153(2)
_cell_measurement_theta_max      72.32
_cell_measurement_theta_min      3.94
_cell_volume                     2269.12(7)
_computing_cell_refinement       'Bruker XSCANS'
_computing_data_collection       'Bruker XSCANS'
_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      153(2)
_diffrn_measured_fraction_theta_full 0.864
_diffrn_measured_fraction_theta_max 0.864
_diffrn_measurement_device_type  'Bruker P4'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0287
_diffrn_reflns_av_sigmaI/netI    0.0449
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            13629
_diffrn_reflns_theta_full        72.32
_diffrn_reflns_theta_max         72.32
_diffrn_reflns_theta_min         3.94
_exptl_absorpt_coefficient_mu    3.380
_exptl_absorpt_correction_T_max  0.8767
_exptl_absorpt_correction_T_min  0.7286
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.306
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             936
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.681
_refine_diff_density_min         -0.352
_refine_diff_density_rms         0.076
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.026
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     485
_refine_ls_number_reflns         7730
_refine_ls_number_restraints     54
_refine_ls_restrained_S_all      1.025
_refine_ls_R_factor_all          0.0489
_refine_ls_R_factor_gt           0.0366
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0530P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0891
_refine_ls_wR_factor_ref         0.0952
_reflns_number_gt                6247
_reflns_number_total             7730
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om200573g_si_006.cif
_cod_data_source_block           sad1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
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_cod_original_sg_symbol_H-M      P-1
_cod_database_code               4065122