Tetramethylcyclopentadienyl vs Cyclopentadienyl Substituents. Synthesis and Structural Characterization of Organolanthanide Compounds Derived from the Versatile Ligand Me2Si(C5Me4H)(C2B10H11)
Zi, Guofu; Yang, Qingchuan; Mak, Thomas C. W.; Xie, Zuowei; Organometallics 20 (2001) 2359–; doi:10.1021/om010031i

data_4077281
_publ_section_title
;
 Tetramethylcyclopentadienyl vs Cyclopentadienyl Substituents. Synthesis
 and Structural Characterization of Organolanthanide Compounds Derived
 from the Versatile Ligand Me2Si(C5Me4H)(C2B10H11)
;
_journal_issue                   11
_journal_name_full               Organometallics
_journal_page_first              2359
_journal_paper_doi               10.1021/om010031i
_journal_volume                  20
_journal_year                    2001
_chemical_formula_sum            'C26 H42 Cl2 Li O2 Yb'
_chemical_formula_weight         637.48
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           147
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  '-P 3'
_symmetry_space_group_name_H-M   'P -3'
_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                120.00
_cell_formula_units_Z            12
_cell_length_a                   29.950(4)
_cell_length_b                   29.950(4)
_cell_length_c                   12.983(1)
_cell_measurement_temperature    296(2)
_cell_volume                     10086(2)
_computing_cell_refinement       'BIOTEX Rigaku'
_computing_data_collection       'RAXIS Rigaku'
_computing_data_reduction        'BIOTEX Rigaku'
_computing_molecular_graphics    'Siemens SHELXTL'
_computing_publication_material  'Siemens SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.689
_diffrn_measured_fraction_theta_max 0.689
_diffrn_measurement_device_type  'IP Rigaku'
_diffrn_measurement_method       IP
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotation anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1629
_diffrn_reflns_av_sigmaI/netI    0.1308
_diffrn_reflns_limit_h_max       34
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       29
_diffrn_reflns_limit_k_min       -34
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            15368
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.75
_exptl_absorpt_coefficient_mu    2.957
_exptl_absorpt_correction_T_max  1.087
_exptl_absorpt_correction_T_min  0.796
_exptl_absorpt_correction_type   abscor
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.260
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             3852
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.481
_refine_diff_density_min         -0.429
_refine_diff_density_rms         0.089
_refine_ls_extinction_coef       0.00006(6)
_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   1.192
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     562
_refine_ls_number_reflns         7273
_refine_ls_number_restraints     271
_refine_ls_restrained_S_all      1.176
_refine_ls_R_factor_all          0.1241
_refine_ls_R_factor_gt           0.0846
_refine_ls_shift/su_max          0.149
_refine_ls_shift/su_mean         0.014
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0903P)^2^+0.1115P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2043
_refine_ls_wR_factor_ref         0.2309
_reflns_number_gt                5447
_reflns_number_total             7273
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om010031i.cif
_cod_data_source_block           compound_7
_cod_original_cell_volume        10085(2)
_cod_original_sg_symbol_H-M      P-3
_cod_database_code               4077281