Trimeric liquid crystals assembled using both hydrogen and halogen bonding.
Präsang, Carsten; Nguyen, H Loc; Horton, Peter N; Whitwood, Adrian C; Bruce, Duncan W; Chemical communications (Cambridge, England)  (2008) 6164–6166; doi:10.1039/b811716k

data_7103569
_publ_section_title
;
 Trimeric liquid crystals assembled using both hydrogen and halogen
 bonding.
;
_journal_issue                   46
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              6164
_journal_page_last               6166
_journal_paper_doi               10.1039/b811716k
_journal_year                    2008
_chemical_formula_moiety         'C14 H13 N O, C6 H F4 I O'
_chemical_formula_sum            'C20 H14 F4 I N O2'
_chemical_formula_weight         503.22
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.0363(5)
_cell_length_b                   8.5988(6)
_cell_length_c                   35.409(3)
_cell_measurement_reflns_used    6280
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      27.35
_cell_measurement_theta_min      2.44
_cell_volume                     1837.9(3)
_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, 1997)'
_diffrn_ambient_temperature      110(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_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  0.0358
_diffrn_reflns_av_sigmaI/netI    0.0370
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       49
_diffrn_reflns_limit_l_min       -49
_diffrn_reflns_number            20820
_diffrn_reflns_theta_full        30.01
_diffrn_reflns_theta_max         30.01
_diffrn_reflns_theta_min         2.30
_exptl_absorpt_coefficient_mu    1.798
_exptl_absorpt_correction_T_max  0.931
_exptl_absorpt_correction_T_min  0.766
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS v2.03; (Sheldrick)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.819
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             984
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.04
_refine_diff_density_max         1.046
_refine_diff_density_min         -1.103
_refine_diff_density_rms         0.100
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.01(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.134
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     277
_refine_ls_number_reflns         5331
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.134
_refine_ls_R_factor_all          0.0441
_refine_ls_R_factor_gt           0.0377
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0453P)^2^+0.0300P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0841
_refine_ls_wR_factor_ref         0.0865
_reflns_number_gt                4841
_reflns_number_total             5331
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b811716k.txt
_cod_data_source_block           dwb0814m
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               7103569