Crystal structures, intermolecular interactions and fluorescence properties of a series of symmetrical bi-1,3,4-oxadiazole derivatives
Fangyi Chen; Taiji Tian; Binglian Bai; Jian Wang; Haitao Wang; Min Li; Journal of Materials Chemistry C 4 (2016) 4451–4458; doi:10.1039/C6TC00324A

data_7234770
_publ_section_title
;
 Crystal structures, intermolecular interactions and fluorescence
 properties of a series of symmetrical bi-1,3,4-oxadiazole derivatives
;
_journal_name_full               'Journal of Materials Chemistry C'
_journal_page_first              4451
_journal_page_last               4458
_journal_paper_doi               10.1039/C6TC00324A
_journal_volume                  4
_journal_year                    2016
_chemical_formula_sum            'C16 H8 F2 N4 O2'
_chemical_formula_weight         326.26
_chemical_name_common            BOXD-p-F
_chemical_name_systematic        2,2-bis(4-fluorophenyl)-bi-1,3,4-oxadiazole
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_cell_setting           monoclinic
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 99.63(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.425(3)
_cell_length_b                   3.8641(8)
_cell_length_c                   27.628(6)
_cell_measurement_reflns_used    3188
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      3.08
_cell_volume                     1413.0(5)
_computing_cell_refinement       'Bruker XSCANS'
_computing_data_collection       'Bruker XSCANS'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker P4'
_diffrn_measurement_method       '\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  0.0450
_diffrn_reflns_av_sigmaI/netI    0.0432
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       4
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       35
_diffrn_reflns_limit_l_min       -35
_diffrn_reflns_number            12410
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.08
_exptl_absorpt_coefficient_mu    0.123
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.534
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             664
_refine_diff_density_max         0.199
_refine_diff_density_min         -0.134
_refine_diff_density_rms         0.042
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.926
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     217
_refine_ls_number_reflns         3188
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.926
_refine_ls_R_factor_all          0.0932
_refine_ls_R_factor_gt           0.0433
_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^)+(0.0557P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0952
_refine_ls_wR_factor_ref         0.1127
_reflns_number_gt                1688
_reflns_number_total             3188
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            J-Mater-Chem-C-2016-4-4451.cif
_cod_data_source_block           boxd-p-f
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7234770