Synthesis, characterization of bridged bis(amidinate) lanthanide amides and their application as catalysts for addition of amines to nitriles for monosubstituted N-arylamidines.
Li, Wenbo; Xue, Mingqiang; Xu, Fan; Tu, Jing; Zhang, Yong; Shen, Qi; Dalton transactions (Cambridge, England : 2003) 41 (2012) 8252–8260; doi:10.1039/c2dt30400g

data_7019445
_publ_section_title
;
 Synthesis, characterization of bridged bis(amidinate) lanthanide amides
 and their application as catalysts for addition of amines to nitriles for
 monosubstituted N-arylamidines.
;
_journal_issue                   27
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              8252
_journal_page_last               8260
_journal_paper_doi               10.1039/c2dt30400g
_journal_volume                  41
_journal_year                    2012
_chemical_formula_moiety         'C51 H66 N7 O2 Si2 Yb, 2(0.5(C7 H8))'
_chemical_formula_sum            'C58 H74 N7 O2 Si2 Yb'
_chemical_formula_weight         1130.46
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_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                 97.886(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.8432(9)
_cell_length_b                   20.1542(13)
_cell_length_c                   22.7598(15)
_cell_measurement_reflns_used    24983
_cell_measurement_temperature    223(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      3.0
_cell_volume                     5835.5(7)
_computing_cell_refinement       CrystalClear
_computing_data_collection       CrystalClear
_computing_data_reduction        CrystalStructure
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      223(2)
_diffrn_detector_area_resol_mean 14.63
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Rigaku Saturn'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.0707
_diffrn_reflns_av_sigmaI/netI    0.0896
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            29811
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         3.02
_exptl_absorpt_coefficient_mu    1.689
_exptl_absorpt_correction_T_max  0.780
_exptl_absorpt_correction_T_min  0.497
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.287
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2340
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.719
_refine_diff_density_min         -0.946
_refine_diff_density_rms         0.097
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.187
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     607
_refine_ls_number_reflns         10830
_refine_ls_number_restraints     21
_refine_ls_restrained_S_all      1.195
_refine_ls_R_factor_all          0.0971
_refine_ls_R_factor_gt           0.0742
_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^)+(0.0431P)^2^+5.9940P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1404
_refine_ls_wR_factor_ref         0.1505
_reflns_number_gt                8632
_reflns_number_total             10830
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2dt30400g.txt
_cod_data_source_block           shelxl10
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7019445