Europium(II) and Ytterbium(II) Cyclic Organohydroborates with Agostic Interactions
Xuenian Chen; Soyoung Lim; Christine E. Plečnik; Shengming Liu; Bin Du; Edward A. Meyers; Sheldon G. Shore; Inorganic Chemistry 44 (2005) 6052–6061; doi:10.1021/ic050573i

data_4309445
_publ_section_title
;
Europium(II) and Ytterbium(II) Cyclic Organohydroborates with Agostic
Interactions
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              6052
_journal_page_last               6061
_journal_paper_doi               10.1021/ic050573i
_journal_volume                  44
_journal_year                    2005
_chemical_formula_sum            'C64 H128 B4 Eu K2 O8'
_chemical_formula_weight         1299.08
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           137
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-P 4ac 2a'
_symmetry_space_group_name_H-M   'P 42/n m c :2'
_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            2
_cell_length_a                   13.4390(10)
_cell_length_b                   13.4390(10)
_cell_length_c                   20.4214(10)
_cell_measurement_temperature    240(2)
_cell_volume                     3688.2(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      240(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  0.0336
_diffrn_reflns_av_sigmaI/netI    0.0177
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            24113
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         2.51
_exptl_absorpt_coefficient_mu    0.504
_exptl_absorpt_correction_T_max  0.8593
_exptl_absorpt_correction_T_min  0.8432
_exptl_crystal_density_diffrn    0.585
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             697
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.31
_exptl_crystal_size_min          0.31
_refine_diff_density_max         0.375
_refine_diff_density_min         -0.287
_refine_diff_density_rms         0.055
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.057
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     107
_refine_ls_number_reflns         1782
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.057
_refine_ls_R_factor_all          0.0641
_refine_ls_R_factor_gt           0.0452
_refine_ls_shift/su_max          0.020
_refine_ls_shift/su_mean         0.004
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0854P)^2^+2.9960P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1383
_refine_ls_wR_factor_ref         0.1553
_reflns_number_gt                1253
_reflns_number_total             1782
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic050573isi20050413_044257_1.cif
_cod_data_source_block           complex3
_cod_depositor_comments
;

2021-05-16
Z value and formula fixed to values more according to usual
chemical conventions.                 miguel
;
_cod_original_formula_weight         324.77
_cod_original_formula_units_Z            4
_cod_original_sg_symbol_H-M      'P 42/n m c'
_cod_original_formula_sum        'C16 H32 B Eu0.25 K0.50 O2'
_cod_database_code               4309445