Contraction and Expansion of the Silicon Scaffold of Stable Si6R6 Isomers
Kai Abersfelder; Adam Russell; Henry S. Rzepa; Andrew J. P. White; Peter R. Haycock; David Scheschkewitz; Journal of the American Chemical Society 134 (2012) 16008–16016; doi:10.1021/ja307344f

data_4118689
_publ_section_title
;
 Contraction and Expansion of the Silicon Scaffold of Stable Si6R6 Isomers
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              16008
_journal_page_last               16016
_journal_paper_doi               10.1021/ja307344f
_journal_volume                  134
_journal_year                    2012
_chemical_formula_moiety         'C90 H138 Cl2 Si6, 0.5(C6 H6)'
_chemical_formula_sum            'C93 H141 Cl2 Si6'
_chemical_formula_weight         1498.50
_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                 97.7245(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   33.8021(4)
_cell_length_b                   26.3632(3)
_cell_length_c                   20.2985(2)
_cell_measurement_reflns_used    35779
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      31.3593
_cell_measurement_theta_min      2.9321
_cell_volume                     17924.5(3)
_computing_cell_refinement       'CrysAlis RED, Oxford Diffraction Ltd'
_computing_data_collection       'CrysAlis CCD, Oxford Diffraction Ltd'
_computing_data_reduction        'CrysAlis RED, Oxford Diffraction Ltd'
_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      173(2)
_diffrn_detector_area_resol_mean 15.9825
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.893
_diffrn_measurement_device_type  'OD Xcalibur 3'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance (Mo) X-ray Source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0292
_diffrn_reflns_av_sigmaI/netI    0.0394
_diffrn_reflns_limit_h_max       47
_diffrn_reflns_limit_h_min       -46
_diffrn_reflns_limit_k_max       36
_diffrn_reflns_limit_k_min       -36
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            82540
_diffrn_reflns_theta_full        29.50
_diffrn_reflns_theta_max         31.43
_diffrn_reflns_theta_min         2.94
_exptl_absorpt_coefficient_mu    0.195
_exptl_absorpt_correction_T_max  0.956
_exptl_absorpt_correction_T_min  0.926
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
; 
CrysAlisPro, Oxford Diffraction Ltd., 
Version 1.171.34.36 (release 02-08-2010 CrysAlis171 .NET) 
(compiled Aug  2 2010,13:00:58) 
Analytical numeric absorption correction using a multifaceted crystal 
model based on expressions derived by R.C. Clark & J.S. Reid. 
(Clark, R. C. & Reid, J. S. (1995). Acta Cryst. A51, 887-897) 
;
_exptl_crystal_colour            'Pale yellow'
_exptl_crystal_density_diffrn    1.111
_exptl_crystal_description       blocks
_exptl_crystal_F_000             6536
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.38
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.969
_refine_diff_density_min         -0.631
_refine_diff_density_rms         0.077
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.097
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     939
_refine_ls_number_reflns         26485
_refine_ls_number_restraints     102
_refine_ls_restrained_S_all      1.104
_refine_ls_R_factor_all          0.0885
_refine_ls_R_factor_gt           0.0562
_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^)+(0.0901P)^2^+14.1236P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1524
_refine_ls_wR_factor_ref         0.1718
_reflns_number_gt                19297
_reflns_number_total             26485
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja307344f_si_002_6.cif
_cod_data_source_block           12.benzene
_cod_database_code               4118689