Octakis(tert-butoxo)dicerium(IV) [Ce2(O(t)Bu)8]: Synthesis, Characterization, Decomposition, and Reactivity.
Schläfer, Johannes; Tyrra, Wieland; Mathur, Sanjay; Inorganic chemistry 53 (2014) 2751–2753; doi:10.1021/ic4025876

data_4337636
_publ_section_title
;
 Octakis(tert-butoxo)dicerium(IV) [Ce2(O(t)Bu)8]: Synthesis,
 Characterization, Decomposition, and Reactivity.
;
_journal_issue                   6
_journal_name_full               'Inorganic chemistry'
_journal_page_first              2751
_journal_page_last               2753
_journal_paper_doi               10.1021/ic4025876
_journal_volume                  53
_journal_year                    2014
_chemical_formula_moiety         'C36 H81 Ce2 O9'
_chemical_formula_sum            'C36 H81 Ce2 O9'
_chemical_formula_weight         938.27
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           57
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2c 2b'
_symmetry_space_group_name_H-M   'P b c m'
_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                   13.983(5)
_cell_length_b                   20.167(5)
_cell_length_c                   17.063(5)
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      26.88
_cell_measurement_theta_min      2.02
_cell_volume                     4812(3)
_computing_cell_refinement       'X-Area (Stoe & Cie, 2001)'
_computing_data_collection       'X-Area (Stoe & Cie, 2001)'
_computing_data_reduction        'X-Area (Stoe & Cie, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 'not measured'
_diffrn_measured_fraction_theta_full 0.937
_diffrn_measured_fraction_theta_max 0.937
_diffrn_measurement_device_type  'IPDS 2 T (Stoe & Cie)'
_diffrn_measurement_method       '\w and \f 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  0.1064
_diffrn_reflns_av_sigmaI/netI    0.0419
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            68200
_diffrn_reflns_theta_full        26.88
_diffrn_reflns_theta_max         26.88
_diffrn_reflns_theta_min         2.02
_diffrn_standards_decay_%        'not measured'
_diffrn_standards_interval_count 'not measured'
_diffrn_standards_interval_time  'not measured'
_diffrn_standards_number         'not measured'
_exptl_absorpt_coefficient_mu    1.908
_exptl_absorpt_correction_T_max  0.7146
_exptl_absorpt_correction_T_min  0.1649
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details
;
The absorption correction (X-RED; Stoe & Cie, 2001)
was preformed after optimizing the crystal shape
using X-SHAPE (Stoe & Cie, 1999).
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.294
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1940
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.5
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.664
_refine_diff_density_min         -0.740
_refine_diff_density_rms         0.114
_refine_ls_extinction_coef       0.0020(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.014
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     242
_refine_ls_number_reflns         5032
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.014
_refine_ls_R_factor_all          0.0612
_refine_ls_R_factor_gt           0.0405
_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^)+(0.0679P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1001
_refine_ls_wR_factor_ref         0.1108
_reflns_number_gt                3573
_reflns_number_total             5032
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic4025876_si_001.cif
_cod_data_source_block           3
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      'P bcm'
_cod_database_code               4337636