Self-assembly of highly luminescent bi-1,3,4-oxadiazole derivatives through electron donor‒acceptor interactions in three-dimensional crystals, two-dimensional layers and mesophases
Qu, Songnan; Chen, Xiaofang; Shao, Xiang; Li, Fan; Zhang, Hongyu; Wang, Haitao; Zhang, Peng; Yu, Zhixin; Wu, Kai; Wang, Yue; Li, Min; Journal of Materials Chemistry 18 (2008) 3954–; doi:10.1039/b804189j

data_7202102
_publ_section_title
;
 Self-assembly of highly luminescent bi-1,3,4-oxadiazole derivatives
 through electron donor--acceptor interactions in three-dimensional
 crystals, two-dimensional layers and mesophases
;
_journal_issue                   33
_journal_name_full               'Journal of Materials Chemistry'
_journal_page_first              3954
_journal_paper_doi               10.1039/b804189j
_journal_volume                  18
_journal_year                    2008
_chemical_formula_sum            'C18 H14 N4 O4'
_chemical_formula_weight         350.33
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_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                 92.69(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.4194(13)
_cell_length_b                   8.2680(17)
_cell_length_c                   15.213(3)
_cell_measurement_reflns_used    5565
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.57
_cell_measurement_theta_min      3.39
_cell_volume                     806.5(3)
_computing_cell_refinement       PROCESS-AUTO
_computing_data_collection       PROCESS-AUTO
_computing_data_reduction        PROCESS-AUTO
_computing_molecular_graphics    'SHELXL-97 (Sheldrick, 1997)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 10.0
_diffrn_measured_fraction_theta_full 0.979
_diffrn_measured_fraction_theta_max 0.979
_diffrn_measurement_device_type  'Rigaku RAXIS-RAPID'
_diffrn_measurement_method       'Omega scan'
_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  0.0285
_diffrn_reflns_av_sigmaI/netI    0.0252
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            7435
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         3.39
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  .
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.105
_exptl_absorpt_correction_T_max  0.9869
_exptl_absorpt_correction_T_min  0.9634
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
Higashi, T. (1995) Progrom for Absorption Correcttion.
Rigaku Corporation, Tokyo, Japan.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.443
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       block
_exptl_crystal_F_000             364
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.204
_refine_diff_density_min         -0.123
_refine_diff_density_rms         0.035
_refine_ls_extinction_coef       0
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.087
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     146
_refine_ls_number_reflns         1814
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.087
_refine_ls_R_factor_all          0.0580
_refine_ls_R_factor_gt           0.0368
_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^)+(0.0524P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0916
_refine_ls_wR_factor_ref         0.0983
_reflns_number_gt                1256
_reflns_number_total             1814
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b804189j.txt
_cod_data_source_block           z1
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'MONOCLINIC' changed to 'monoclinic'
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)/n
_cod_database_code               7202102