Solid state conformations of symmetrical aromatic biheterocycles: an X-ray crystallographic investigation.
Fitchett, Christopher M.; Richardson, Chris; Steel, Peter J.; Organic & biomolecular chemistry 3 (2005) 498–502; doi:10.1039/b416553e

data_7150050
_publ_section_title
;
 Solid state conformations of symmetrical aromatic biheterocycles: an
 X-ray crystallographic investigation.
;
_journal_issue                   3
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              498
_journal_page_last               502
_journal_paper_doi               10.1039/b416553e
_journal_volume                  3
_journal_year                    2005
_chemical_formula_moiety         'C14 H8 N2 O2'
_chemical_formula_sum            'C14 H8 N2 O2'
_chemical_formula_weight         236.22
_chemical_name_common            2,2'-Bibenzoxazole
_chemical_name_systematic
;
2,2'-Bibenzoxazole
;
_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                 94.340(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   4.6270(10)
_cell_length_b                   16.480(2)
_cell_length_c                   7.0040(10)
_cell_measurement_reflns_used    26
_cell_measurement_temperature    163(2)
_cell_measurement_theta_max      13
_cell_measurement_theta_min      5
_cell_volume                     532.54(15)
_computing_cell_refinement       xscans
_computing_data_collection       xscans
_computing_data_reduction        xscans
_computing_molecular_graphics    xp
_computing_publication_material  xcif
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      163(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Seimens P4s"'
_diffrn_measurement_method       omega
_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  0.0354
_diffrn_reflns_av_sigmaI/netI    0.0536
_diffrn_reflns_limit_h_max       3
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            1733
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         2.47
_diffrn_standards_decay_%        5
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.101
_exptl_absorpt_correction_T_max  0.982
_exptl_absorpt_correction_T_min  0.840
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   xscans
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.473
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             244
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.199
_refine_diff_density_min         -0.167
_refine_diff_density_rms         0.051
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.920
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     82
_refine_ls_number_reflns         1044
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.920
_refine_ls_R_factor_all          0.0656
_refine_ls_R_factor_gt           0.0441
_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^)+(0.0672P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1071
_refine_ls_wR_factor_ref         0.1126
_reflns_number_gt                741
_reflns_number_total             1044
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b416553e.txt
_cod_data_source_block           3cr4
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/adriana/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 1555 2011-01-17 13:19:09Z saulius 
;
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7150050