σ-Bond electron delocalization of branched oligogermanes and germanium containing oligosilanes
Hlina, Johann; Zitz, Rainer; Wagner, Harald; Stella, Filippo; Baumgartner, Judith; Marschner, Christoph; Inorganica Chimica Acta 422 (2014) 120–133; doi:10.1016/j.ica.2014.07.005

data_1542865
_publ_section_title
;
 \s-Bond electron delocalization of branched oligogermanes and germanium
 containing oligosilanes
;
_journal_name_full               'Inorganica Chimica Acta'
_journal_page_first              120
_journal_page_last               133
_journal_paper_doi               10.1016/j.ica.2014.07.005
_journal_volume                  422
_journal_year                    2014
_chemical_formula_sum            'C20 H60 Ge2 Si7'
_chemical_formula_weight         642.49
_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                 107.01(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.055(3)
_cell_length_b                   9.2847(19)
_cell_length_c                   24.665(5)
_cell_measurement_reflns_used    6276
_cell_measurement_temperature    240(2)
_cell_measurement_theta_max      52.529
_cell_measurement_theta_min      4.978
_cell_volume                     3734.9(14)
_computing_cell_refinement       'Bruker XSCANS'
_computing_data_collection       'Bruker XSCANS'
_computing_data_reduction        'Bruker SHELXTL'
_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      240(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'SMART APEX'
_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  0.0302
_diffrn_reflns_av_sigmaI/netI    0.0273
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            14488
_diffrn_reflns_theta_full        26.36
_diffrn_reflns_theta_max         26.36
_diffrn_reflns_theta_min         1.73
_exptl_absorpt_coefficient_mu    1.842
_exptl_absorpt_correction_T_max  0.7696
_exptl_absorpt_correction_T_min  0.5262
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.143
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       blocks
_exptl_crystal_F_000             1368
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.415
_refine_diff_density_min         -0.172
_refine_diff_density_rms         0.056
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     173
_refine_ls_number_reflns         3811
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0394
_refine_ls_R_factor_gt           0.0326
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.016
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0509P)^2^+0.8108P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0840
_refine_ls_wR_factor_ref         0.0872
_reflns_number_gt                3253
_reflns_number_total             3811
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            all.cif
_cod_data_source_block           10_845j
_cod_original_cell_volume        3734.7(13)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               1542865