In situ observation and mechanistic elucidation of metastable colored species in crystalline state photochromism of trans-biindenylidenedione
Fujii, Kotaro; Aruga, Kumiko; Sekine, Akiko; Uekusa, Hidehiro; Sohno, Katsuya; Tanaka, Koichi; CrystEngComm 13 (2011) 731–; doi:10.1039/c0ce00642d

data_7205487
_publ_section_title
;
 In situ observation and mechanistic elucidation of metastable colored
 species in crystalline state photochromism of
 trans-biindenylidenedione
;
_journal_issue                   3
_journal_name_full               CrystEngComm
_journal_page_first              731
_journal_paper_doi               10.1039/c0ce00642d
_journal_volume                  13
_journal_year                    2011
_chemical_formula_moiety         'C32 H24 O2'
_chemical_formula_sum            'C32 H24 O2'
_chemical_formula_weight         440.51
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_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_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 111.656(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.3843(15)
_cell_length_b                   14.2937(19)
_cell_length_c                   15.125(2)
_cell_measurement_reflns_used    30435
_cell_measurement_temperature    93(2)
_cell_measurement_theta_max      27.61
_cell_measurement_theta_min      1.92
_cell_volume                     2287.5(5)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT & SADABS'
_computing_molecular_graphics    ORTEP-3
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      93(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker SMART CCD area detector system'
_diffrn_measurement_method       '\w scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0554
_diffrn_reflns_av_sigmaI/netI    0.0347
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            30435
_diffrn_reflns_theta_full        27.61
_diffrn_reflns_theta_max         27.61
_diffrn_reflns_theta_min         1.92
_diffrn_source                   'rotating anode X-ray tube'
_exptl_absorpt_coefficient_mu    0.078
_exptl_absorpt_correction_T_max  0.9977
_exptl_absorpt_correction_T_min  0.9769
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'absorption was corrected by SADABS'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.279
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       platelet
_exptl_crystal_F_000             928
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.317
_refine_diff_density_min         -0.217
_refine_diff_density_rms         0.050
_refine_ls_extinction_coef       0.0068(12)
_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   1.019
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     376
_refine_ls_number_reflns         5280
_refine_ls_number_restraints     32
_refine_ls_restrained_S_all      1.018
_refine_ls_R_factor_all          0.0712
_refine_ls_R_factor_gt           0.0471
_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^)+(0.0764P)^2^+0.2014P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1191
_refine_ls_wR_factor_ref         0.1308
_reflns_number_gt                3760
_reflns_number_total             5280
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            C0CE00642D.TXT
_cod_data_source_block           sad2
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7205487