Diastereoselective, synergistic dual-mode optical switch with integrated chirochromic helicene and photochromic bis-azobenzene moieties.
Chen, Wen-Ching; Lee, Yi-Wei; Chen, Chien-Tien; Organic letters 12 (2010) 1472–1475; doi:10.1021/ol100117s

data_1502862
_publ_section_title
;
 Diastereoselective, synergistic dual-mode optical switch with integrated
 chirochromic helicene and photochromic bis-azobenzene moieties.
;
_journal_issue                   7
_journal_name_full               'Organic letters'
_journal_page_first              1472
_journal_page_last               1475
_journal_paper_doi               10.1021/ol100117s
_journal_volume                  12
_journal_year                    2010
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C46 H40 N2 O6'
_chemical_formula_sum            'C46 H40 N2 O6'
_chemical_formula_weight         716.80
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_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                 95.3810(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   10.9995(3)
_cell_length_b                   14.5737(4)
_cell_length_c                   12.0336(4)
_cell_measurement_reflns_used    14092
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      25.35
_cell_measurement_theta_min      2.037
_cell_volume                     1920.53(10)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction        'HKL Denzo and Scalepack'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1986)'
_diffrn_ambient_temperature      200(2)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       'CCD rotation images, thick slices'
_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  0.0939
_diffrn_reflns_av_sigmaI/netI    0.0839
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            17788
_diffrn_reflns_theta_full        25.41
_diffrn_reflns_theta_max         25.41
_diffrn_reflns_theta_min         2.20
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  1.1366
_exptl_absorpt_correction_T_min  0.8931
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 ?
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.240
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             756
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.674
_refine_diff_density_min         -0.581
_refine_diff_density_rms         0.195
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -1.6(18)
_refine_ls_extinction_coef       0.165(9)
_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   1.151
_refine_ls_hydrogen_treatment    fixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     488
_refine_ls_number_reflns         6304
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.151
_refine_ls_R_factor_all          0.1088
_refine_ls_R_factor_gt           0.0740
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1076P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1582
_refine_ls_wR_factor_ref         0.1959
_reflns_number_gt                4601
_reflns_number_total             6304
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol100117s_si_004.cif
_cod_data_source_block           7110
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               1502862