A base-free synthetic route to anti-bimetallic lanthanide pentalene complexes.
Kilpatrick, Alexander F. R.; Cloke, F Geoffrey N; Dalton transactions (Cambridge, England : 2003) 46 (2017) 5587–5597; doi:10.1039/c6dt04475a

data_7041563
_publ_section_title
;
 A base-free synthetic route to anti-bimetallic lanthanide pentalene
 complexes.
;
_journal_issue                   17
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              5587
_journal_page_last               5597
_journal_paper_doi               10.1039/c6dt04475a
_journal_volume                  46
_journal_year                    2017
_chemical_formula_moiety         'C46 H76 Si2 Yb2, 2(C4 H12 Si)'
_chemical_formula_sum            'C54 H100 Si4 Yb2'
_chemical_formula_weight         1207.77
_chemical_name_systematic        '[Cp*Yb]2(\m:\h5,\h5-Pn?)'
_chemical_properties_physical    ', Air-sensitive,Moisture-sensitive'
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_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_date             2016-11-21
_audit_creation_method
;
Olex2 1.2
(compiled 2016.11.07 svn.r3352 for OlexSys, GUI svn.r5261)
;
_audit_update_record
;
2016-11-22 deposited with the CCDC.
2016-12-22 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 114.10(3)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   13.133(3)
_cell_length_b                   17.767(4)
_cell_length_c                   13.725(3)
_cell_measurement_reflns_used    11285
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      0.998
_cell_volume                     2923.4(13)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Bruker AXS BV, 1997-2004)'
_computing_data_reduction
;
HKL Denzo and Scalepack (Otwinowski & Minor 1997)
;
_computing_molecular_graphics    'Ortep-3 (Farrugia, 1997)'
_computing_publication_material
;
OLEX2 (Dolomanov et al, 2009), SHELXL-2013 (Sheldrick, 2013), 
PLATON (Spek, 2003), WinGX (Farrugia, 2013)
;
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_computing_structure_solution    'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173.15
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       'CCD rotation images, thick slices'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0821
_diffrn_reflns_av_unetI/netI     0.0915
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.993
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            21146
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.993
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.467
_diffrn_reflns_theta_min         2.811
_diffrn_source
;
'horizonally mounted graphite crystal
;
_exptl_absorpt_coefficient_mu    3.293
_exptl_absorpt_correction_T_max  0.8796
_exptl_absorpt_correction_T_min  0.8269
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS 2007/2 (Sheldrick, G.M., 2007)'
_exptl_crystal_colour            Brown
_exptl_crystal_density_diffrn    1.372
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             1240
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: Tetramethylsilane'
_exptl_crystal_size_max          0.06
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.04
_refine_diff_density_max         1.362
_refine_diff_density_min         -0.648
_refine_diff_density_rms         0.156
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.015
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     271
_refine_ls_number_reflns         6636
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.015
_refine_ls_R_factor_all          0.0909
_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
'w=1/[\s^2^(Fo^2^)+(0.0287P)^2^+5.0844P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0814
_refine_ls_wR_factor_ref         0.0952
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4413
_reflns_number_total             6636
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c6dt04475a2.cif
_cod_data_source_block           Compound1
_cod_depositor_comments
'Adding full bibliography for 7041560--7041563.cif.'
_cod_original_cell_volume        2923.2(12)
_cod_database_code               7041563
_shelx_estimated_absorpt_t_max   0.880
_shelx_estimated_absorpt_t_min   0.827
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C9(H9), C12(H12), C15(H15)
2.b Me refined with riding coordinates:
 C10(H10A,H10B,H10C), C010(H01A,H01B,H01C), C11(H11A,H11B,H11C), C13(H13A,H13B,
 H13C), C14(H14A,H14B,H14C), C16(H16A,H16B,H16C), C17(H17A,H17B,H17C),
 C021(H02A,H02B,H02C), C23(H23A,H23B,H23C), C24(H24A,H24B,H24C), C25(H25A,H25B,
 H25C), C28(H28A,H28B,H28C), C29(H29A,H29B,H29C), C30(H30A,H30B,H30C), C31(H31A,
 H31B,H31C)
2.c Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3)
;
_shelx_shelxl_version_number     2016/4
_olex2_submission_special_instructions 'No special instructions were received'