Structural transformations in crystals induced by radiation and pressure. Part 5. The influence of pressure on the course of the photochemical reaction in crystals of 2,6-difluorocinnamic acid
Galica, T.; Bąkowicz, J.; Konieczny, K.; Turowska-Tyrk, I.; CrystEngComm 18 (2016) 8871–; doi:10.1039/C6CE01652A

data_7226848
_publ_section_title
;
 Structural transformations in crystals induced by radiation and pressure.
 Part 5. The influence of pressure on the course of the photochemical
 reaction in crystals of 2,6-difluorocinnamic acid
;
_journal_issue                   46
_journal_name_full               CrystEngComm
_journal_page_first              8871
_journal_paper_doi               10.1039/C6CE01652A
_journal_volume                  18
_journal_year                    2016
_chemical_formula_sum            'C9 H6 F2 O2'
_chemical_formula_weight         184.14
_chemical_properties_physical    ', Photo-sensitive'
_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     isomor
_atom_sites_solution_secondary   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2016-07-27 deposited with the CCDC.
2016-10-19 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 91.72(6)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   3.6358(17)
_cell_length_b                   18.973(11)
_cell_length_c                   10.701(13)
_cell_measurement_pressure       2100000
_cell_measurement_reflns_used    337
_cell_measurement_temperature    299(2)
_cell_measurement_theta_max      18.10
_cell_measurement_theta_min      6.33
_cell_volume                     737.8(11)
_computing_cell_refinement       'CrysAlisPro (Agilent Technologies, 2014)'
_computing_data_collection       'CrysAlisPro (Agilent Technologies, 2014)'
_computing_data_reduction        'CrysAlisPro (Agilent Technologies, 2014)'
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_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXS-2013/1 (Sheldrick, 2008)'
_diffrn_ambient_pressure         2100000
_diffrn_ambient_temperature      299(2)
_diffrn_detector_area_resol_mean 15.9718
_diffrn_measured_fraction_theta_full 0.509
_diffrn_measured_fraction_theta_max 0.509
_diffrn_measurement_device_type  'KM4 with Eos CCD'
_diffrn_measurement_method       '\f- and \w 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  0.1210
_diffrn_reflns_av_unetI/netI     0.0924
_diffrn_reflns_Laue_measured_fraction_full 0.509
_diffrn_reflns_Laue_measured_fraction_max 0.509
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -18
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_diffrn_reflns_limit_l_min       -9
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_diffrn_reflns_point_group_measured_fraction_full 0.509
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_exptl_absorpt_coefficient_mu    0.149
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
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_exptl_crystal_description       block
_exptl_crystal_F_000             376
_exptl_crystal_size_max          0.24
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_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.203
_refine_diff_density_min         -0.237
_refine_diff_density_rms         0.054
_refine_ls_extinction_method     none
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_refine_ls_matrix_type           full
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_refine_ls_number_reflns         621
_refine_ls_number_restraints     29
_refine_ls_restrained_S_all      1.119
_refine_ls_R_factor_all          0.2524
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_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.2000P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.3060
_refine_ls_wR_factor_ref         0.3922
_reflns_Friedel_coverage         0.000
_reflns_number_gt                229
_reflns_number_total             621
_reflns_threshold_expression     'I > 2\s(I)'
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_cod_data_source_block           180secUV_p3
_cod_depositor_comments
'Adding full bibliography for 7226837--7226849.cif.'
_cod_database_code               7226848
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