Alkali metal complexes of sterically hindered mono- and di-carbanions containing Si-O bonds.
Bowman, Lyndsey J.; Izod, Keith; Clegg, William; Harrington, Ross W.; Smith, J. David; Eaborn, C.; Dalton transactions (Cambridge, England : 2003)  (2006) 502–508; doi:10.1039/b510692c

data_7006443
_publ_section_title
;
 Alkali metal complexes of sterically hindered mono- and di-carbanions
 containing Si-O bonds.
;
_journal_issue                   3
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              502
_journal_page_last               508
_journal_paper_doi               10.1039/b510692c
_journal_year                    2006
_chemical_formula_moiety         'C22 H58 K2 O2 Si6'
_chemical_formula_sum            'C22 H58 K2 O2 Si6'
_chemical_formula_weight         601.42
_chemical_name_systematic
;
?
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 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                 98.5763(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.3506(7)
_cell_length_b                   11.8073(5)
_cell_length_c                   20.1478(9)
_cell_measurement_reflns_used    10926
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      28.69
_cell_measurement_theta_min      2.18
_cell_volume                     3610.9(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL and local programs'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    SIR97
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.939
_diffrn_measurement_device_type  'Bruker SMART 1K CCD diffractometer'
_diffrn_measurement_method       'thin-slice \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0249
_diffrn_reflns_av_sigmaI/netI    0.0238
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            16058
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         28.94
_diffrn_reflns_theta_min         2.04
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.478
_exptl_absorpt_correction_T_max  0.911
_exptl_absorpt_correction_T_min  0.825
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.106
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1312
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.775
_refine_diff_density_min         -0.333
_refine_diff_density_rms         0.058
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.055
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     195
_refine_ls_number_reflns         4477
_refine_ls_number_restraints     86
_refine_ls_restrained_S_all      1.046
_refine_ls_R_factor_all          0.0623
_refine_ls_R_factor_gt           0.0454
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0673P)^2^+4.1663P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1212
_refine_ls_wR_factor_ref         0.1368
_reflns_number_gt                3486
_reflns_number_total             4477
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            b510692c.txt
_cod_data_source_block           ki205_compound5
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               7006443