Synthesis and characterisation of bulky guanidines and phosphaguanidines: precursors for low oxidation state metallacycles
Jin, Guoxia; Jones, Cameron; Junk, Peter C.; Lippert, Kai-Alexander; Rose, Richard P.; Stasch, Andreas; New Journal of Chemistry 33 (2009) 64–; doi:10.1039/b809120j

data_7051586
_publ_section_title
;
 Synthesis and characterisation of bulky guanidines and
 phosphaguanidines: precursors for low oxidation state metallacycles
;
_journal_issue                   1
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              64
_journal_paper_doi               10.1039/b809120j
_journal_volume                  33
_journal_year                    2009
_chemical_formula_sum            'C40 H61 N3 Si'
_chemical_formula_weight         612.01
_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           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 104.59(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   35.510(7)
_cell_length_b                   9.877(2)
_cell_length_c                   21.966(4)
_cell_measurement_temperature    123(2)
_cell_volume                     7456(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_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  0.0810
_diffrn_reflns_av_sigmaI/netI    0.0962
_diffrn_reflns_limit_h_max       43
_diffrn_reflns_limit_h_min       -45
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            58137
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         27.00
_diffrn_reflns_theta_min         3.03
_exptl_absorpt_coefficient_mu    0.093
_exptl_absorpt_correction_T_max  0.977
_exptl_absorpt_correction_T_min  0.907
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sortav (Blessing, 1995)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.090
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2688
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.346
_refine_diff_density_min         -0.297
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.994
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     823
_refine_ls_number_reflns         16069
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.994
_refine_ls_R_factor_all          0.1177
_refine_ls_R_factor_gt           0.0546
_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^)+(0.0691P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1184
_refine_ls_wR_factor_ref         0.1380
_reflns_number_gt                9350
_reflns_number_total             16069
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b809120j.txt
_cod_data_source_block           compound7
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7051586