Cyclic diynes with tetramethyldisilyl groups in the bridges. Syntheses and properties
Haberhauer, Gebhard; Gleiter, Rolf; Irngartinger, Hermann; Oeser, Thomas; Rominger, Frank; Journal of the Chemical Society, Perkin Transactions 2  (1999) 2093–; doi:10.1039/a904409d

data_7213115
_publ_section_title
;
 Cyclic diynes with tetramethyldisilyl groups in the bridges. Syntheses
 and properties
;
_journal_issue                   10
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 2'
_journal_page_first              2093
_journal_paper_doi               10.1039/a904409d
_journal_year                    1999
_chemical_formula_sum            'C14 H24 Si2'
_chemical_formula_weight         248.51
_chemical_name_systematic
; 
 1,1,2,2-Tetramethyl-1,2-disilacyclododeca-4,10-diyne (10) 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 110.4480(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.4260(2)
_cell_length_b                   12.31510(10)
_cell_length_c                   13.0649(2)
_cell_measurement_temperature    200(2)
_cell_volume                     1571.80(4)
_computing_cell_refinement       'Siemens XSCANS'
_computing_data_collection       'Siemens XSCANS'
_computing_data_reduction        'Siemens SHELXTL'
_computing_molecular_graphics    'Siemens SHELXTL'
_computing_publication_material  'Siemens SHELXTL'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      200(2)
_diffrn_measurement_device       'Siemens CCD'
_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  0.0170
_diffrn_reflns_av_sigmaI/netI    0.0225
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            7035
_diffrn_reflns_theta_max         25.63
_diffrn_reflns_theta_min         2.08
_exptl_absorpt_coefficient_mu    0.203
_exptl_absorpt_correction_T_max  0.962477
_exptl_absorpt_correction_T_min  0.737649
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.050
_exptl_crystal_description       fragment
_exptl_crystal_F_000             544
_exptl_crystal_size_max          .46
_exptl_crystal_size_mid          .36
_exptl_crystal_size_min          .26
_refine_diff_density_max         0.246
_refine_diff_density_min         -0.217
_refine_diff_density_rms         0.037
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.034
_refine_ls_goodness_of_fit_obs   1.060
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     241
_refine_ls_number_reflns         2680
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.034
_refine_ls_restrained_S_obs      1.060
_refine_ls_R_factor_all          0.0360
_refine_ls_R_factor_obs          0.0296
_refine_ls_shift/esd_max         -0.001
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0477P)^2^+0.2732P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0795
_refine_ls_wR_factor_obs         0.0755
_reflns_number_observed          2336
_reflns_number_total             2680
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            904409dsup1.cif
_cod_data_source_block           gh6
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0477P)^2^+0.2732P] 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^)+(0.0477P)^2^+0.2732P] 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      P2(1)/c
_cod_database_code               7213115