Trifluoromethyl groups in crystal design of 1,4-diphenyl-1,3-butadienes for topochemical [2 + 2] photodimerization.
Liu, Jin; Wendt, Natalie L.; Boarman, Kelly J.; Organic letters 7 (2005) 1007–1010; doi:10.1021/ol0475111

data_1506463
_publ_section_title
;
 Trifluoromethyl groups in crystal design of 1,4-diphenyl-1,3-butadienes
 for topochemical [2 + 2] photodimerization.
;
_journal_issue                   6
_journal_name_full               'Organic letters'
_journal_page_first              1007
_journal_page_last               1010
_journal_paper_doi               10.1021/ol0475111
_journal_volume                  7
_journal_year                    2005
_chemical_formula_moiety         'C20 H10 F12'
_chemical_formula_sum            'C20 H10 F12'
_chemical_formula_weight         478.28
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_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                 94.405(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   4.8166(12)
_cell_length_b                   11.259(3)
_cell_length_c                   16.773(4)
_cell_measurement_reflns_used    4961
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.18
_cell_volume                     906.9(4)
_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  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
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_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0522
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_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            9288
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_diffrn_reflns_theta_max         27.58
_diffrn_reflns_theta_min         2.18
_exptl_absorpt_coefficient_mu    0.188
_exptl_absorpt_correction_T_max  0.9777
_exptl_absorpt_correction_T_min  0.9117
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2003)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.751
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Needle
_exptl_crystal_F_000             476
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.416
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_refine_ls_extinction_method     none
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_refine_ls_number_reflns         2077
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_refine_ls_restrained_S_all      1.051
_refine_ls_R_factor_all          0.0545
_refine_ls_R_factor_gt           0.0445
_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^)+(0.0792P)^2^+0.4038P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1222
_refine_ls_wR_factor_ref         0.1325
_reflns_number_gt                1719
_reflns_number_total             2077
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol0475111si20050128_024516.cif
_cod_data_source_block           04237b
_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 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Multi-scan'
changed to 'multi-scan' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               1506463