Unusual Negative Photochromism via a Short-Lived Imidazolyl Radical of 1,1'-Binaphthyl-Bridged Imidazole Dimer
Sayaka Hatano; Takeru Horino; Atsuhiro Tokita; Toyoji Oshima; Jiro Abe; Journal of the American Chemical Society 135 (2013) 3164–3172; doi:10.1021/ja311344u

data_4119392
_publ_section_title
;
 Unusual Negative Photochromism via a Short-Lived Imidazolyl Radical of
 1,1'-Binaphthyl-Bridged Imidazole Dimer
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              3164
_journal_page_last               3172
_journal_paper_doi               10.1021/ja311344u
_journal_volume                  135
_journal_year                    2013
_chemical_formula_sum            'C48 H39 N5 O4'
_chemical_formula_weight         749.84
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                97.528(2)
_cell_angle_beta                 90.858(2)
_cell_angle_gamma                111.830(2)
_cell_formula_units_Z            2
_cell_length_a                   10.4714(18)
_cell_length_b                   11.641(2)
_cell_length_c                   17.271(3)
_cell_measurement_reflns_used    5870
_cell_measurement_temperature    90
_cell_measurement_theta_max      25.39
_cell_measurement_theta_min      2.34
_cell_volume                     1932.8(6)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_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      90
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 0.977
_diffrn_measured_fraction_theta_max 0.977
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \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  0.0136
_diffrn_reflns_av_sigmaI/netI    0.0214
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            9497
_diffrn_reflns_theta_full        25.42
_diffrn_reflns_theta_max         25.42
_diffrn_reflns_theta_min         1.19
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.9755
_exptl_absorpt_correction_T_min  0.9596
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS Sheldrick 1996'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.288
_exptl_crystal_description       block
_exptl_crystal_F_000             788
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.222
_refine_diff_density_min         -0.225
_refine_diff_density_rms         0.038
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.008
_refine_ls_hydrogen_treatment    'no refined H'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     519
_refine_ls_number_reflns         6950
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.008
_refine_ls_R_factor_all          0.0387
_refine_ls_R_factor_gt           0.0339
_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^)+(0.0362P)^2^+0.8441P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0802
_refine_ls_wR_factor_ref         0.0839
_reflns_number_gt                6185
_reflns_number_total             6950
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja311344u_si_002.cif
_cod_data_source_block           ana_2
_cod_original_cell_volume        1932.9(6)
_cod_database_code               4119392