Synthetic and structural studies on C-ethynyl- and C-bromo-carboranes.
Fox, Mark A.; Cameron, Audrey M.; Low, Paul J.; Paterson, Michael A. J.; Batsanov, Andrei S.; Goeta, Andrés E; Rankin, David W. H.; Robertson, Heather E.; Schirlin, Julien T.; Dalton transactions (Cambridge, England : 2003)  (2006) 3544–3560; doi:10.1039/b517538k

data_7007106
_publ_section_title
;
 Synthetic and structural studies on C-ethynyl- and C-bromo-carboranes.
;
_journal_issue                   29
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              3544
_journal_page_last               3560
_journal_paper_doi               10.1039/b517538k
_journal_year                    2006
_chemical_formula_moiety         'C8 H18 Br2 Si2'
_chemical_formula_sum            'C8 H18 Br2 Si2'
_chemical_formula_weight         330.22
_chemical_name_common
trans-1,2-dibromo-1,2-bis(trimethylsilyl)-ethene
_chemical_name_systematic
;
trans-1,2-dibromo-1,2-bis(trimethylsilyl)-ethene
;
_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-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.4980(4)
_cell_length_b                   11.101(1)
_cell_length_c                   18.698(2)
_cell_measurement_reflns_used    992
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.88
_cell_measurement_theta_min      12.09
_cell_volume                     1348.8(2)
_computing_cell_refinement       'SMART version 5.054 (Bruker, 1999)'
_computing_data_collection       'SMART version 5.054 (Bruker, 1999)'
_computing_data_reduction        'SAINT version 6.02A (Bruker, 2001)'
_computing_molecular_graphics    'SHELXTL version 5.10 (Bruker, 1997)'
_computing_publication_material  'SHELXTL version 5.10 (Bruker, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 8
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'SMART 1K CCD area detector'
_diffrn_measurement_method       '\w 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  0.0523
_diffrn_reflns_av_sigmaI/netI    0.0275
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            15332
_diffrn_reflns_theta_full        29.06
_diffrn_reflns_theta_max         29.06
_diffrn_reflns_theta_min         2.18
_exptl_absorpt_coefficient_mu    6.146
_exptl_absorpt_correction_T_max  0.6937
_exptl_absorpt_correction_T_min  0.1440
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details
'XPREP (SHELXTL), R(int)=0.230 before correction'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.626
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.495
_refine_diff_density_min         -0.270
_refine_diff_density_rms         0.072
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     91
_refine_ls_number_reflns         1802
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.0255
_refine_ls_R_factor_gt           0.0195
_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^)+(0.0216P)^2^+0.3668P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0476
_refine_ls_wR_factor_ref         0.0503
_reflns_number_gt                1586
_reflns_number_total             1802
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            b517538k.txt
_cod_data_source_block           (13)
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured ' was changed to
'?' - the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7007106