Rare-earth alkyl complexes supported by formamidinate ligands: synthesis, structure, and catalytic activity for isoprene polymerization.
Guo, Liping; Zhu, Xiancui; Zhou, Shuangliu; Mu, Xiaolong; Wei, Yun; Wang, Shaowu; Feng, Zhijun; Zhang, Guangchao; Deng, Baojia; Dalton transactions (Cambridge, England : 2003) 43 (2014) 6842–6847; doi:10.1039/c4dt00242c

data_7029553
_publ_section_title
;
 Rare-earth alkyl complexes supported by formamidinate ligands: synthesis,
 structure, and catalytic activity for isoprene polymerization.
;
_journal_issue                   18
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              6842
_journal_page_last               6847
_journal_paper_doi               10.1039/c4dt00242c
_journal_volume                  43
_journal_year                    2014
_chemical_formula_sum            'C58 H89 N4 O Si Y'
_chemical_formula_weight         975.33
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 92.476(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.795(2)
_cell_length_b                   16.625(3)
_cell_length_c                   28.098(5)
_cell_measurement_reflns_used    9185
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      24.74
_cell_measurement_theta_min      2.44
_cell_volume                     6438.0(19)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_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      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0855
_diffrn_reflns_av_unetI/netI     0.1068
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       36
_diffrn_reflns_limit_l_min       -36
_diffrn_reflns_number            54427
_diffrn_reflns_theta_full        27.55
_diffrn_reflns_theta_max         27.55
_diffrn_reflns_theta_min         1.42
_exptl_absorpt_coefficient_mu    0.960
_exptl_absorpt_correction_T_max  0.7683
_exptl_absorpt_correction_T_min  0.7488
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.006
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2104
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.31
_exptl_crystal_size_min          0.29
_platon_squeeze_details
;
;
_refine_diff_density_max         1.182
_refine_diff_density_min         -0.592
_refine_diff_density_rms         0.064
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.069
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     605
_refine_ls_number_reflns         14817
_refine_ls_number_restraints     30
_refine_ls_restrained_S_all      1.107
_refine_ls_R_factor_all          0.1146
_refine_ls_R_factor_gt           0.0580
_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^)+(0.0415P)^2^+0.7420P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1189
_refine_ls_wR_factor_ref         0.1318
_reflns_number_gt                8140
_reflns_number_total             14817
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4dt00242c2.cif
_cod_data_source_block           complex_2
_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 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_cell_volume        6437.7(19)
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7029553