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_7026160
_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 N6 Si4 Y2'
_chemical_formula_weight         923.18
_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'
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_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
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_cell_length_c                   26.724(2)
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_cell_volume                     4957.9(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 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
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_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       32
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_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         1.52
_exptl_absorpt_coefficient_mu    2.458
_exptl_absorpt_correction_T_max  1.000000
_exptl_absorpt_correction_T_min  0.759939
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2004/1 - Bruker Nonius area detector scaling and absorption correction'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.237
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
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_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0617P)^2^+0.4390P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0998
_refine_ls_wR_factor_ref         0.1234
_reflns_number_gt                2733
_reflns_number_total             4873
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c0dt00246a.txt
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_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_cell_volume        4957.8(6)
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7026160