Monitoring photo-induced transformations in crystals of 2,6-difluorocinnamic acid under ambient conditions
Galica, Tomasz; Bakowicz, Julia; Broda, Piotr; Turowska-Tyrk, Ilona; Acta Crystallographica Section C 72 (2016) 593–599; doi:10.1107/S2053229616010019

data_2020545
_publ_section_title
;
 Monitoring photo-induced transformations in crystals of
 2,6-difluorocinnamic acid under ambient conditions
;
_journal_coeditor_code           YF3104
_journal_issue                   7
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              593
_journal_page_last               599
_journal_paper_doi               10.1107/S2053229616010019
_journal_volume                  72
_journal_year                    2016
_chemical_formula_iupac          '0.858C9 H6 F2 O2, 0.071C18 H12 F4 O4'
_chemical_formula_moiety         '0.858(C9 H6 F2 O2), 0.071(C18 H12 F4 O4)'
_chemical_formula_sum            'C9 H6 F2 O2'
_chemical_formula_weight         184.14
_chemical_name_systematic
;
2,6-Difluorocinnamic
acid--3,4-bis(2,6-difluorophenyl)cyclobutane-1,2-dicarboxylic acid
(0.858/0.071)
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 92.873(14)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   3.8860(6)
_cell_length_b                   19.185(4)
_cell_length_c                   11.1567(14)
_cell_measurement_reflns_used    517
_cell_measurement_temperature    299(2)
_cell_measurement_theta_max      23.2480
_cell_measurement_theta_min      3.6430
_cell_volume                     830.7(2)
_computing_cell_refinement
;
CrysAlis PRO (Agilent, 2014)
;
_computing_data_collection
;
CrysAlis PRO (Agilent, 2014)
;
_computing_data_reduction
;
CrysAlis PRO (Agilent, 2014)
;
_computing_molecular_graphics
;
ORTEP-3 for Windows (Farrugia, 2012),
and Mercury (Macrae <i>et al.</i>,  2006) and
<i>CrystalExplorer</i> (Wolff <i>et al.</i>,  2012)
;
_computing_publication_material
;
SHELXL2014 (Sheldrick, 2015)
;
_computing_structure_refinement
;
SHELXL2014 (Sheldrick, 2015)
;
_computing_structure_solution
;
SHELXS2013 (Sheldrick, 2008)
;
_diffrn_ambient_temperature      299(2)
_diffrn_detector_area_resol_mean 15.9718
_diffrn_measured_fraction_theta_full 0.959
_diffrn_measured_fraction_theta_max 0.959
_diffrn_measurement_device_type  'KM-4 with an Eos CCD'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0468
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            2470
_diffrn_reflns_theta_full        24.989
_diffrn_reflns_theta_max         24.989
_diffrn_reflns_theta_min         2.114
_exptl_absorpt_coefficient_mu    0.133
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.493
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(Scale3 AbsPack; Agilent, 2014)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.472
_exptl_crystal_description       block
_exptl_crystal_F_000             376
_exptl_crystal_size_max          0.62
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.179
_refine_diff_density_min         -0.155
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.038
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     182
_refine_ls_number_reflns         1413
_refine_ls_number_restraints     199
_refine_ls_restrained_S_all      0.989
_refine_ls_R_factor_all          0.1304
_refine_ls_R_factor_gt           0.0742
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1209P)^2^+0.0466P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1879
_refine_ls_wR_factor_ref         0.2326
_reflns_number_gt                772
_reflns_number_total             1413
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            yf3104sup1.cif
_cod_data_source_block           II
_cod_database_code               2020545
_cod_database_fobs_code          2020545
_shelx_estimated_absorpt_t_min   0.922
_shelx_estimated_absorpt_t_max   0.984
_shelx_hkl_checksum              52109
_shelx_res_checksum              5398