Expanding the Steric Coverage Offered by Bis(amidosilyl) Chelates: Isolation of Low-Coordinate N-Heterocyclic Germylene Complexes
Sean K. Liew; S. M. Ibrahim Al-Rafia; James T. Goettel; Paul A. Lummis; Sean M. McDonald; Leah J. Miedema; Michael J. Ferguson; Robert McDonald; Eric Rivard; Inorganic Chemistry 51 (2012) 5471–5480; doi:10.1021/ic300495k

data_4329142
_publ_contact_author_address
;
Department of Chemistry
University of Alberta
Edmonton
AB T6G 2G2
CANADA
;
_publ_contact_author_email       ERIVARD@UALBERTA.CA
_publ_contact_author_name        'E. Rivard'
_publ_section_title
;
 Expanding the Steric Coverage Offered by Bis(amidosilyl) Chelates:
 Isolation of Low-Coordinate N-Heterocyclic Germylene Complexes
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              5471
_journal_page_last               5480
_journal_paper_doi               10.1021/ic300495k
_journal_volume                  51
_journal_year                    2012
_chemical_formula_moiety         'C28 H46 Ge N2 Si2'
_chemical_formula_sum            'C28 H46 Ge N2 Si2'
_chemical_formula_weight         539.44
_chemical_name_common            2
_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                 97.2967(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.5706(4)
_cell_length_b                   15.5783(5)
_cell_length_c                   14.5196(4)
_cell_measurement_reflns_used    9939
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.27
_cell_measurement_theta_min      2.34
_cell_volume                     3044.69(16)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'DIRDIF-2008 (Beurskens et al., 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker APEX-II 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  0.0159
_diffrn_reflns_av_sigmaI/netI    0.0128
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            26915
_diffrn_reflns_theta_full        27.59
_diffrn_reflns_theta_max         27.59
_diffrn_reflns_theta_min         1.93
_exptl_absorpt_coefficient_mu    1.102
_exptl_absorpt_correction_T_max  0.8263
_exptl_absorpt_correction_T_min  0.5514
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2008)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.177
_exptl_crystal_description       prism
_exptl_crystal_F_000             1152
_exptl_crystal_size_max          0.61
_exptl_crystal_size_mid          0.29
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.467
_refine_diff_density_min         -0.309
_refine_diff_density_rms         0.046
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     298
_refine_ls_number_reflns         7038
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.039
_refine_ls_R_factor_all          0.0299
_refine_ls_R_factor_gt           0.0250
_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^)+(0.0456P)^2^+0.6913P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0731
_refine_ls_wR_factor_ref         0.0763
_reflns_number_gt                6181
_reflns_number_total             7038
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ic300495k_si_001_1.cif
_cod_data_source_block           riv1131
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               4329142