From NHC–>germylenes to stable NHC–>germanone complexes.
Yao, Shenglai; Xiong, Yun; Driess, Matthias; Chemical communications (Cambridge, England)  (2009) 6466–6468; doi:10.1039/b914060c

data_7104960
_publ_section_title
;
 From NHC--&gt;germylenes to stable NHC--&gt;germanone complexes.
;
_journal_issue                   42
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              6466
_journal_page_last               6468
_journal_paper_doi               10.1039/b914060c
_journal_year                    2009
_chemical_formula_sum            'C40 H60 Ge N4 O'
_chemical_formula_weight         685.51
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.31.8 (release 12-01-2007 CrysAlis171 .NET)
(compiled Jan 12 2007,17:49:11)
;
_cell_angle_alpha                90.00
_cell_angle_beta                 94.333(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   21.2684(5)
_cell_length_b                   16.9410(4)
_cell_length_c                   21.6339(5)
_cell_measurement_reflns_used    18973
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      32.3558
_cell_measurement_theta_min      3.0395
_cell_volume                     7772.6(3)
_computing_cell_refinement
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.31.8 (release 12-01-2007 CrysAlis171 .NET)
(compiled Jan 12 2007,17:49:11)
;
_computing_data_collection
;
CrysAlis CCD, Oxford Diffraction Ltd.,
Version 1.171.31.8 (release 12-01-2007 CrysAlis171 .NET)
(compiled Jan 12 2007,17:49:11)
;
_computing_data_reduction
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.31.8 (release 12-01-2007 CrysAlis171 .NET)
(compiled Jan 12 2007,17:49:11)
;
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Oxford Diffraction Xcalibur S Sapphire'
_diffrn_measurement_method       \w
_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  0.0693
_diffrn_reflns_av_sigmaI/netI    0.0818
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            71416
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.04
_exptl_absorpt_coefficient_mu    0.822
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.88750
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.32.24 (release 21-04-2008 CrysAlis171 .NET)
(compiled Apr 21 2008,18:23:10)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.172
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             2944
_exptl_crystal_size_max          0.29
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.19
_refine_diff_density_max         0.592
_refine_diff_density_min         -0.536
_refine_diff_density_rms         0.052
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.956
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     859
_refine_ls_number_reflns         13672
_refine_ls_number_restraints     33
_refine_ls_restrained_S_all      0.963
_refine_ls_R_factor_all          0.0823
_refine_ls_R_factor_gt           0.0428
_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^)+(0.0307P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0685
_refine_ls_wR_factor_ref         0.0757
_reflns_number_gt                9650
_reflns_number_total             13672
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b914060c.txt
_cod_data_source_block           3b
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7104960