Difluorenylsilanes, -germanes, and -stannanes Exhibiting an Unprecedented Parallel Arrangement of the Fluorene Units
Nemes, Gabriela Cretiu; Silaghi-Dumitrescu, Luminita; Silaghi-Dumitrescu, Ioan; Escudié, Jean; Ranaivonjatovo, Henri; Molloy, Kieran C.; Mahon, Mary F.; Zukerman-Schpector, Julio; Organometallics 24 (2005) 1134–; doi:10.1021/om049543y

data_4075783
_publ_section_title
;
 Difluorenylsilanes, -germanes, and -stannanes Exhibiting an Unprecedented
 Parallel Arrangement of the Fluorene Units
;
_journal_issue                   6
_journal_name_full               Organometallics
_journal_page_first              1134
_journal_paper_doi               10.1021/om049543y
_journal_volume                  24
_journal_year                    2005
_chemical_formula_sum            'C32 H34 Ge Si'
_chemical_formula_weight         519.27
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 92.231(8)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.0281(7)
_cell_length_b                   15.8575(10)
_cell_length_c                   17.1917(10)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      18.6
_cell_measurement_theta_min      11.3
_cell_volume                     2731.8(3)
_computing_cell_refinement       'CAD4 Software (Enraf-Nonius,1989)'
_computing_data_collection       'CAD4 Software (Enraf-Nonius,1989)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'ZORTEP (Zsolnai, 1995)'
_computing_publication_material  PARST95-Nardelli,PLATON-Spek,WinGX-Farrugia
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'CAD4 Mach3'
_diffrn_measurement_method       w/2q
_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  0.0522
_diffrn_reflns_av_sigmaI/netI    0.1365
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       0
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            5400
_diffrn_reflns_theta_full        25.75
_diffrn_reflns_theta_max         25.75
_diffrn_reflns_theta_min         2.31
_exptl_absorpt_coefficient_mu    1.183
_exptl_absorpt_correction_T_max  0.7978
_exptl_absorpt_correction_T_min  0.7080
_exptl_absorpt_correction_type   psi-scans
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.263
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       irregular
_exptl_crystal_F_000             1088
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.309
_refine_diff_density_min         -0.475
_refine_diff_density_rms         0.075
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.963
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     313
_refine_ls_number_reflns         5223
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.963
_refine_ls_R_factor_all          0.1651
_refine_ls_R_factor_gt           0.0483
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0454P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0956
_refine_ls_wR_factor_ref         0.1248
_reflns_number_gt                2652
_reflns_number_total             5223
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om049543ysi20041215_103715.cif
_cod_data_source_block           6b
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               4075783