Photochromism of asymmetrical diarylethenes with a pyrrole unit: effects of aromatic stabilization energies of aryl rings.
Liu, Gang; Pu, Shouzhi; Wang, Renjie; Organic letters 15 (2013) 980–983; doi:10.1021/ol400188h

data_1508962
_publ_section_title
;
 Photochromism of asymmetrical diarylethenes with a pyrrole unit: effects
 of aromatic stabilization energies of aryl rings.
;
_journal_issue                   5
_journal_name_full               'Organic letters'
_journal_page_first              980
_journal_page_last               983
_journal_paper_doi               10.1021/ol400188h
_journal_volume                  15
_journal_year                    2013
_chemical_formula_sum            'C19 H14 F6 N2'
_chemical_formula_weight         384.32
_chemical_name_systematic
;

 1-(1-methylphenyl)-2-(2-cyano-1,5-
dimethyl-4-pyrryl)perfluorocyclopentene

;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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                 90.383(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.571(3)
_cell_length_b                   13.208(3)
_cell_length_c                   8.2626(17)
_cell_measurement_reflns_used    1741
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      20.16
_cell_measurement_theta_min      2.46
_cell_volume                     1808.4(6)
_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, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.999
_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  0.0481
_diffrn_reflns_av_sigmaI/netI    0.0442
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            13263
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         2.46
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.127
_exptl_absorpt_correction_T_max  0.9713
_exptl_absorpt_correction_T_min  0.9544
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.412
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             784
_exptl_crystal_size_max          0.37
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.23
_refine_diff_density_max         0.382
_refine_diff_density_min         -0.353
_refine_diff_density_rms         0.044
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.037
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     266
_refine_ls_number_reflns         3352
_refine_ls_number_restraints     48
_refine_ls_restrained_S_all      1.169
_refine_ls_R_factor_all          0.1535
_refine_ls_R_factor_gt           0.0717
_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^)+(0.1032P)^2^+1.0759P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1920
_refine_ls_wR_factor_ref         0.2481
_reflns_number_gt                1543
_reflns_number_total             3352
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol400188h_si_003.cif
_cod_data_source_block           a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_cell_volume        1808.5(6)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               1508962