The behavior of pyrrolyl ligands within the rare-earth metal alkyl complexes. Insertion of C=N and C=O double bonds into Ln-sigma-C bonds.
Yang, Yi; Cui, Dongmei; Chen, Xuesi; Dalton transactions (Cambridge, England : 2003) 39 (2010) 3959–3967; doi:10.1039/b926038b

data_7025238
_publ_section_title
;
 The behavior of pyrrolyl ligands within the rare-earth metal alkyl
 complexes. Insertion of C=N and C=O double bonds into Ln-sigma-C bonds.
;
_journal_issue                   16
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              3959
_journal_page_last               3967
_journal_paper_doi               10.1039/b926038b
_journal_volume                  39
_journal_year                    2010
_chemical_formula_sum            'C37 H61 N2 O Si2 Y'
_chemical_formula_weight         694.97
_chemical_name_systematic
;
?
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                   10.1398(6)
_cell_length_b                   18.4371(11)
_cell_length_c                   20.6375(12)
_cell_measurement_temperature    187(2)
_cell_volume                     3858.1(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      187(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0657
_diffrn_reflns_av_sigmaI/netI    0.0952
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            23028
_diffrn_reflns_theta_full        26.05
_diffrn_reflns_theta_max         26.05
_diffrn_reflns_theta_min         1.48
_exptl_absorpt_coefficient_mu    1.602
_exptl_absorpt_correction_T_max  0.8934
_exptl_absorpt_correction_T_min  0.6142
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_density_diffrn    1.196
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1488
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.525
_refine_diff_density_min         -0.381
_refine_diff_density_rms         0.067
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.030(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.582
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     402
_refine_ls_number_reflns         7613
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.582
_refine_ls_R_factor_all          0.0715
_refine_ls_R_factor_gt           0.0473
_refine_ls_shift/su_max          0.015
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1364P)^2^+15.8970P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1176
_refine_ls_wR_factor_ref         0.1439
_reflns_number_gt                5760
_reflns_number_total             7613
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b926038b.txt
_cod_data_source_block           5
_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.

'_exptl_absorpt_correction_type' value 'Multi-scan'
changed to 'multi-scan' 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      P2(1)2(1)2(1)
_cod_database_code               7025238