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_4103657
_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_sum            'C32 H42 N2 Yb'
_chemical_formula_weight         627.72
_chemical_name_common            cyb5dmb
_chemical_name_systematic
;
 cyb5
;
_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            8
_cell_length_a                   18.0976(18)
_cell_length_b                   15.9940(16)
_cell_length_c                   19.676(2)
_cell_measurement_reflns_used    5431
_cell_measurement_temperature    156(2)
_cell_measurement_theta_max      24.87
_cell_measurement_theta_min      2.36
_cell_volume                     5695.3(10)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      156(2)
_diffrn_detector_area_resol_mean 8.366
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0431
_diffrn_reflns_av_sigmaI/netI    0.0297
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            29515
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.38
_diffrn_reflns_theta_min         1.99
_exptl_absorpt_coefficient_mu    3.306
_exptl_absorpt_correction_T_max  0.8263
_exptl_absorpt_correction_T_min  0.6732
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    1.464
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2544
_exptl_crystal_size_max          0.13
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.729
_refine_diff_density_min         -0.377
_refine_diff_density_rms         0.090
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.016
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     328
_refine_ls_number_reflns         5224
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.016
_refine_ls_R_factor_all          0.0392
_refine_ls_R_factor_gt           0.0266
_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^)+(0.0292P)^2^+3.7425P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0574
_refine_ls_wR_factor_ref         0.0628
_reflns_number_gt                4145
_reflns_number_total             5224
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja106902s_si_003.cif
_cod_data_source_block           cyb5
_cod_original_cell_volume        5695.2(10)
_cod_database_code               4103657