Intermediate-Valence Tautomerism in Decamethylytterbocene Complexes of Methyl-Substituted Bipyridines
Corwin H. Booth; Daniel Kazhdan; Evan L. Werkema; Marc D. Walter; Wayne W. Lukens; Eric D. Bauer; Yung-Jin Hu; Laurent Maron; Odile Eisenstein; Martin Head-Gordon; Richard A. Andersen; Journal of the American Chemical Society 132 (2010) 17537–17549; doi:10.1021/ja106902s

data_4103658
_publ_section_title
;
 Intermediate-Valence Tautomerism in Decamethylytterbocene Complexes of
 Methyl-Substituted Bipyridines
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              17537
_journal_page_last               17549
_journal_paper_doi               10.1021/ja106902s
_journal_volume                  132
_journal_year                    2010
_chemical_formula_moiety         'C32 H42 N2 Yb'
_chemical_formula_sum            'C32 H42 N2 Yb'
_chemical_formula_weight         627.72
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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            16
_cell_length_a                   23.847(2)
_cell_length_b                   15.1770(15)
_cell_length_c                   31.291(3)
_cell_measurement_reflns_used    2465
_cell_measurement_temperature    168(2)
_cell_measurement_theta_max      1.00
_cell_measurement_theta_min      0.80
_cell_volume                     11325.0(18)
_computing_cell_refinement       'Bruker SAINT v 7.07'
_computing_data_collection       'Bruker SMART v5.631'
_computing_data_reduction        'Bruker SAINT v 7.07'
_computing_molecular_graphics    'Bruker-AXS xR v.6'
_computing_publication_material  'Bruker-AXS xR v.6'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      168(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEX'
_diffrn_measurement_method       '\w 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  0.1172
_diffrn_reflns_av_sigmaI/netI    0.0854
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       34
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            54138
_diffrn_reflns_theta_full        23.22
_diffrn_reflns_theta_max         23.22
_diffrn_reflns_theta_min         2.17
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    3.325
_exptl_absorpt_correction_T_max  1.0
_exptl_absorpt_correction_T_min  0.8
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'Blessing, 1995'
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.473
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             5088
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.06
_refine_diff_density_max         1.129
_refine_diff_density_min         -0.564
_refine_diff_density_rms         0.119
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.980
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     655
_refine_ls_number_reflns         8087
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.980
_refine_ls_R_factor_all          0.1180
_refine_ls_R_factor_gt           0.0507
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0446P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1002
_refine_ls_wR_factor_ref         0.1205
_reflns_number_gt                4310
_reflns_number_total             8087
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja106902s_si_004.cif
_cod_data_source_block           yb6d
_cod_original_cell_volume        11325(2)
_cod_database_code               4103658