The irreversible thermo-bleaching function of a photochromic diarylethene having trimethylsilyl groups
Kobatake, Seiya; Imagawa, Hiroyuki; Nakatani, Hidenori; Nakashima, Seiichiro; New Journal of Chemistry 33 (2009) 1362–; doi:10.1039/b822372f

data_7053780
_publ_section_title
;
 The irreversible thermo-bleaching function of a photochromic diarylethene
 having trimethylsilyl groups
;
_journal_issue                   6
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              1362
_journal_paper_doi               10.1039/b822372f
_journal_volume                  33
_journal_year                    2009
_chemical_formula_moiety         'C25 H12 F4 S2'
_chemical_formula_sum            'C25 H12 F4 S2'
_chemical_formula_weight         452.47
_chemical_name_systematic
;
4,4,5,6-Tetrafluoro-2,8-diphenyl-4H-1,9-dithia-trindene
(1d)
;
_space_group_IT_number           32
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2 -2ab'
_symmetry_space_group_name_H-M   'P b a 2'
_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            4
_cell_length_a                   19.245(10)
_cell_length_b                   24.970(11)
_cell_length_c                   3.9399(19)
_cell_measurement_reflns_used    12278
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      27.6
_cell_measurement_theta_min      3.2
_cell_volume                     1893.3(16)
_computing_cell_refinement       PROCESS-AUTO
_computing_data_collection       PROCESS-AUTO
_computing_data_reduction        CrystalStructure
_computing_molecular_graphics    ORTEP-3
_computing_publication_material  CrystalStructure
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      123(2)
_diffrn_detector_area_resol_mean 10.00
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Rigaku RAXIS-RAPID'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.1461
_diffrn_reflns_av_sigmaI/netI    0.1806
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       32
_diffrn_reflns_limit_k_min       -32
_diffrn_reflns_limit_l_max       5
_diffrn_reflns_limit_l_min       -5
_diffrn_reflns_number            12987
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.24
_exptl_absorpt_coefficient_mu    0.331
_exptl_absorpt_correction_T_max  0.9837
_exptl_absorpt_correction_T_min  0.8521
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
Higashi, T. (1995). Program for Absorption Correction.
Rigaku Corporation, Tokyo, Japan.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.587
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             920
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.312
_refine_diff_density_min         -0.269
_refine_diff_density_rms         0.062
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.11(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.803
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     299
_refine_ls_number_reflns         4257
_refine_ls_number_restraints     14
_refine_ls_restrained_S_all      0.803
_refine_ls_R_factor_all          0.1303
_refine_ls_R_factor_gt           0.0589
_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^)+(0.0342P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1006
_refine_ls_wR_factor_ref         0.1149
_reflns_number_gt                2083
_reflns_number_total             4257
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b822372fsup1.cif
_cod_data_source_block           shelxl
_cod_database_code               7053780