Rare-earth metal alkyl complexes bearing an alkoxy N-heterocyclic carbene ligand: synthesis, characterization, catalysis for isoprene polymerization
Long, Shiyu; Wang, Baoli; Xie, Hongyan; Yao, Changguang; Wu, Chunji; Cui, Dongmei; New J. Chem. 39 (2015) 7682–; doi:10.1039/C5NJ00737B

data_7054969
_publ_section_title
;
 Rare-earth metal alkyl complexes bearing an alkoxy N-heterocyclic carbene
 ligand: synthesis, characterization, catalysis for isoprene
 polymerization
;
_journal_issue                   10
_journal_name_full               'New J. Chem.'
_journal_page_first              7682
_journal_paper_doi               10.1039/C5NJ00737B
_journal_volume                  39
_journal_year                    2015
_chemical_formula_sum            'C40 H86 N4 O2 Si4 Y2'
_chemical_formula_weight         945.3
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2015-06-25 deposited with the CCDC.
2015-07-02 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 103.216(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   25.040(3)
_cell_length_b                   10.6891(10)
_cell_length_c                   20.951(2)
_cell_measurement_reflns_used    2064
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      19.8630
_cell_measurement_theta_min      2.2235
_cell_volume                     5459.1(10)
_computing_data_collection       'Bruker XSCANS'
_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 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker P4'
_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  0.0565
_diffrn_reflns_av_unetI/netI     0.1292
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -30
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            14999
_diffrn_reflns_theta_full        26.05
_diffrn_reflns_theta_max         26.05
_diffrn_reflns_theta_min         1.67
_exptl_absorpt_coefficient_mu    2.235
_exptl_absorpt_correction_T_max  0.7304
_exptl_absorpt_correction_T_min  0.6635
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.150
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2016
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.820
_refine_diff_density_min         -0.292
_refine_diff_density_rms         0.079
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.011(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.945
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     487
_refine_ls_number_reflns         8697
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      0.945
_refine_ls_R_factor_all          0.0946
_refine_ls_R_factor_gt           0.0552
_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^)+(0.0089P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0926
_refine_ls_wR_factor_ref         0.1045
_reflns_number_gt                5925
_reflns_number_total             8697
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c5nj00737b2.cif
_cod_data_source_block           4a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 3271 2015-04-21 07:52:19Z andrius 

 Adding full bibliography for 7054968--7054972.cif.
;
_cod_original_cell_volume        5459.0(9)
_cod_original_sg_symbol_H-M      Cc
_cod_database_code               7054969