Fluorinated liquid crystals: evaluation of selectively fluorinated facially polarised cyclohexyl motifs for liquid crystal applications.
Al-Maharik, Nawaf; Kirsch, Peer; Slawin, Alexandra M. Z.; Cordes, David B.; O'Hagan, David; Organic & biomolecular chemistry 14 (2016) 9974–9980; doi:10.1039/c6ob01986b

data_7155350
_publ_section_title
;
 Fluorinated liquid crystals: evaluation of selectively fluorinated
 facially polarised cyclohexyl motifs for liquid crystal applications.
;
_journal_issue                   42
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              9974
_journal_page_last               9980
_journal_paper_doi               10.1039/c6ob01986b
_journal_volume                  14
_journal_year                    2016
_chemical_formula_moiety         'C21 H28 F4'
_chemical_formula_sum            'C21 H28 F4'
_chemical_formula_weight         356.45
_space_group_crystal_system      monoclinic
_space_group_IT_number           13
_space_group_name_Hall           '-P 2yc'
_space_group_name_H-M_alt        'P 1 2/c 1'
_symmetry_space_group_name_Hall  '-P 2yc'
_symmetry_space_group_name_H-M   'P 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2015-09-01
_audit_creation_method           'by CrystalStructure 4.1'
_audit_update_record
;
2016-09-08 deposited with the CCDC.
2016-10-07 downloaded from the CCDC.
;
_cell_angle_alpha                90.0000
_cell_angle_beta                 91.791(7)
_cell_angle_gamma                90.0000
_cell_formula_units_Z            4
_cell_length_a                   11.943(2)
_cell_length_b                   5.5757(11)
_cell_length_c                   27.176(6)
_cell_measurement_reflns_used    1998
_cell_measurement_temperature    125
_cell_measurement_theta_max      68.25
_cell_measurement_theta_min      24.02
_cell_volume                     1808.8(6)
_computing_cell_refinement       'CrystalClear-SM Expert 2.1 b28'
_computing_data_collection       'CrystalClear-SM Expert 2.1 b28 (Rigaku, 2013)'
_computing_data_reduction        'CrystalClear-SM Expert 2.1 b28'
_computing_molecular_graphics    'CrystalStructure 4.1'
_computing_publication_material  'CrystalStructure 4.1 (Rigaku, 2014)'
_computing_structure_refinement  'SHELXL2013 (Sheldrick, 2008)'
_computing_structure_solution    'SIR2011 (Burla, et al., 2012)'
_diffrn_ambient_temperature      125
_diffrn_detector_area_resol_mean 5.811
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Rigaku XtaLAB P200'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54187
_diffrn_reflns_av_R_equivalents  0.0500
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       32
_diffrn_reflns_limit_l_min       -32
_diffrn_reflns_number            23264
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        67.687
_diffrn_reflns_theta_max         68.262
_diffrn_reflns_theta_min         3.254
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.863
_exptl_absorpt_correction_T_max  0.983
_exptl_absorpt_correction_T_min  0.871
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'REQAB (Rigaku, 1998)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.309
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       platelet
_exptl_crystal_F_000             760.00
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: Dichloromethane'
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.200
_exptl_crystal_size_min          0.020
_refine_diff_density_max         0.44
_refine_diff_density_min         -0.37
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.059
_refine_ls_hydrogen_treatment    constr
_refine_ls_number_parameters     227
_refine_ls_number_reflns         3315
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0537
_refine_ls_R_factor_gt           0.0516
_refine_ls_shift/su_max          0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.1323P)^2^+0.3158P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1699
_refine_ls_wR_factor_ref         0.1727
_reflns_number_gt                3025
_reflns_number_total             3315
_reflns_threshold_expression     F^2^>2.0\s(F^2^)
_cod_data_source_file            c6ob01986b2.cif
_cod_data_source_block           3
_cod_original_cell_volume        1808.7(6)
_cod_database_code               7155350
_shelx_res_checksum              12295