Cationic rare-earth metal bis(tetrahydridoborato) complexes: direct synthesis, structure and ring-opening polymerisation activity toward cyclic esters
Robert, Dominique; Kondracka, Małgorzata; Okuda, Jun; Dalton Transactions  (2008) 2667–2669; doi:10.1039/b801030g

data_7003886
_publ_section_title
;
 Cationic rare-earth metal bis(tetrahydridoborato) complexes: direct
 synthesis, structure and ring-opening polymerisation activity toward
 cyclic esters
;
_journal_issue                   20
_journal_name_full               'Dalton Transactions'
_journal_page_first              2667
_journal_page_last               2669
_journal_paper_doi               10.1039/b801030g
_journal_year                    2008
_chemical_formula_moiety         'C20 H48 B2 O5 Sm, C24 H20 B'
_chemical_formula_sum            'C44 H68 B3 O5 Sm'
_chemical_formula_weight         859.76
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 90.071(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.070(6)
_cell_length_b                   13.534(6)
_cell_length_c                   24.936(11)
_cell_measurement_reflns_used    976
_cell_measurement_temperature    130(2)
_cell_measurement_theta_max      22.44
_cell_measurement_theta_min      3.12
_cell_volume                     4411(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXT'
_computing_publication_material  'Bruker SHELXT'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      130(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.903
_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  0.0843
_diffrn_reflns_av_sigmaI/netI    0.0843
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            54897
_diffrn_reflns_theta_full        28.00
_diffrn_reflns_theta_max         29.40
_diffrn_reflns_theta_min         0.82
_exptl_absorpt_coefficient_mu    1.372
_exptl_absorpt_correction_T_max  0.8103
_exptl_absorpt_correction_T_min  0.6836
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   Platon
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.295
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1796
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.19
_exptl_crystal_size_min          0.16
_refine_diff_density_max         1.448
_refine_diff_density_min         -2.868
_refine_diff_density_rms         0.114
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.007
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     503
_refine_ls_number_reflns         11001
_refine_ls_number_restraints     10
_refine_ls_restrained_S_all      1.008
_refine_ls_R_factor_all          0.0638
_refine_ls_R_factor_gt           0.0464
_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^)+(0.0300P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0855
_refine_ls_wR_factor_ref         0.0884
_reflns_number_gt                7937
_reflns_number_total             11001
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b801030g.txt
_cod_data_source_block           dr1460
_cod_original_sg_symbol_Hall     -P2ybc
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7003886