Rare earth metal bis(trimethylsilyl)amido complexes bearing pyrrolyl-methylamide ligand. Synthesis, structure, and catalytic activity towards guanylation of amines.
Liu, Chao; Zhou, Shuangliu; Wang, Shaowu; Zhang, Lijun; Yang, Gaosheng; Dalton transactions (Cambridge, England : 2003) 39 (2010) 8994–8999; doi:10.1039/c0dt00246a

data_7026162
_publ_section_title
;
 Rare earth metal bis(trimethylsilyl)amido complexes bearing
 pyrrolyl-methylamide ligand. Synthesis, structure, and catalytic activity
 towards guanylation of amines.
;
_journal_issue                   38
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              8994
_journal_page_last               8999
_journal_paper_doi               10.1039/c0dt00246a
_journal_volume                  39
_journal_year                    2010
_chemical_formula_sum            'C40 H68 Er2 N6 Si4'
_chemical_formula_weight         1079.88
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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                   12.4386(8)
_cell_length_b                   14.9104(10)
_cell_length_c                   26.6642(17)
_cell_measurement_reflns_used    9984
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.56
_cell_measurement_theta_min      2.24
_cell_volume                     4945.3(6)
_computing_cell_refinement       'Bruker XSCANS'
_computing_data_collection       'Bruker XSCANS'
_computing_data_reduction        'Bruker SAINT'
_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      293(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_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  0.0419
_diffrn_reflns_av_sigmaI/netI    0.0277
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       32
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            40636
_diffrn_reflns_theta_full        27.63
_diffrn_reflns_theta_max         27.63
_diffrn_reflns_theta_min         1.53
_exptl_absorpt_coefficient_mu    3.499
_exptl_absorpt_correction_T_max  1.000000
_exptl_absorpt_correction_T_min  0.647869
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2004/1 - Bruker Nonius area detector scaling and absorption correction'
_exptl_crystal_colour            pink
_exptl_crystal_density_diffrn    1.450
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             2168
_exptl_crystal_size_max          0.31
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.865
_refine_diff_density_min         -0.459
_refine_diff_density_rms         0.079
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.237
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     269
_refine_ls_number_reflns         5739
_refine_ls_number_restraints     63
_refine_ls_restrained_S_all      1.249
_refine_ls_R_factor_all          0.0638
_refine_ls_R_factor_gt           0.0353
_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^)+(0.0347P)^2^+0.6813P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0781
_refine_ls_wR_factor_ref         0.0882
_reflns_number_gt                3912
_reflns_number_total             5739
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c0dt00246a.txt
_cod_data_source_block           ccdc-770562
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7026162