Synthesis of MII[N(SiMe3)2][Me3SiNC(tBu)NSiMe3] (M = Sn, Ge) from Amidinate Precursors: Active Catalysts for Phenyl Isocyanate Cyclization
Stephen R. Foley; Yuanlin Zhou; Glenn P. A. Yap; Darrin S. Richeson; Inorganic Chemistry 39 (2000) 924–929; doi:10.1021/ic991004b

data_4300161
_publ_section_title
;
Synthesis of MII[N(SiMe3)2][Me3SiNC(tBu)NSiMe3] (M = Sn, Ge) from Amidinate
Precursors: Active Catalysts for Phenyl Isocyanate Cyclization
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              924
_journal_page_last               929
_journal_volume                  39
_journal_year                    2000
_chemical_formula_sum            'C16 H42 N4 Si4 Sn'
_chemical_formula_weight         521.59
_space_group_IT_number           60
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2n 2ab'
_symmetry_space_group_name_H-M   'P b c n'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.998(1)
_cell_length_b                   12.154(1)
_cell_length_c                   20.084(2)
_cell_measurement_reflns_used    'reflections from 60 data frames'
_cell_measurement_temperature    203(2)
_cell_measurement_theta_max      28.29
_cell_measurement_theta_min      1.47
_cell_volume                     2684.6(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_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      203(2)
_diffrn_measured_fraction_theta_full 0.933
_diffrn_measured_fraction_theta_max 0.933
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0605
_diffrn_reflns_av_sigmaI/netI    0.0408
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            16190
_diffrn_reflns_theta_full        28.34
_diffrn_reflns_theta_max         28.34
_diffrn_reflns_theta_min         2.03
_diffrn_standards_decay_%        <1
_diffrn_standards_number         '50 standard frames at start and end'
_exptl_absorpt_coefficient_mu    1.138
_exptl_absorpt_correction_T_max  0.928069
_exptl_absorpt_correction_T_min  0.605001
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Blessing, Acta Cryst. (1995) A51 33-38.'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.290
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1088
_exptl_crystal_size_max          .4
_exptl_crystal_size_mid          .4
_exptl_crystal_size_min          .4
_refine_diff_density_max         0.778
_refine_diff_density_min         -0.737
_refine_diff_density_rms         0.095
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.058
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     114
_refine_ls_number_reflns         3134
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.058
_refine_ls_R_factor_all          0.0456
_refine_ls_R_factor_gt           0.0362
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0588P)^2^+1.1989P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0975
_refine_ls_wR_factor_ref         0.1002
_reflns_number_gt                2598
_reflns_number_total             3134
_reflns_threshold_expression     >2sigma(I)
_cod_database_code               4300161
_journal_paper_doi 10.1021/ic991004b