The unusual electrochemical and photophysical behavior of 2,2'-bis(1,3,4-oxadiazol-2-yl)biphenyls, effective electron transport hosts for phosphorescent organic light emitting diodes.
Leung, Man-kit; Yang, Chih-Chiang; Lee, Jiun-Haw; Tsai, Hsin-Hung; Lin, Chi-Feng; Huang, Chih-Yen; Su, Yuhlong Oliver; Chiu, Chi-Feng; Organic letters 9 (2007) 235–238; doi:10.1021/ol062668+

data_1516657
_publ_section_title
;
 The unusual electrochemical and photophysical behavior of
 2,2'-bis(1,3,4-oxadiazol-2-yl)biphenyls, effective electron transport
 hosts for phosphorescent organic light emitting diodes.
;
_journal_issue                   2
_journal_name_full               'Organic letters'
_journal_page_first              235
_journal_page_last               238
_journal_paper_doi               10.1021/ol062668+
_journal_volume                  9
_journal_year                    2007
_chemical_formula_sum            'C28 H18 N4 O2'
_chemical_formula_weight         442.46
_space_group_IT_number           60
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2n 2ab'
_symmetry_space_group_name_H-M   'P b c n'
_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                   11.3862(5)
_cell_length_b                   10.0904(6)
_cell_length_c                   18.8335(9)
_cell_measurement_reflns_used    23146
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      1
_cell_volume                     2163.81(19)
_computing_cell_refinement       'HKL Denzo & Scalepack (Otwinowski & Minor)'
_computing_data_collection       'COLLECT (Nonius BV)'
_computing_data_reduction        'HKL Denzo & Scalepack (Otwinowski & Minor)'
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       CCD
_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  0.0734
_diffrn_reflns_av_sigmaI/netI    0.0604
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            11367
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         2.16
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_T_max  0.988
_exptl_absorpt_correction_T_min  0.969
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
multi-scan from symmetry-related measurements 
 Sortav (Blessing 1995) 
;
_exptl_crystal_density_diffrn    1.358
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             920
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.183
_refine_diff_density_min         -0.151
_refine_diff_density_rms         0.046
_refine_ls_extinction_coef       0.012(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.109
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     155
_refine_ls_number_reflns         2448
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.109
_refine_ls_R_factor_all          0.1237
_refine_ls_R_factor_gt           0.0537
_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^)+(0.0790P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1217
_refine_ls_wR_factor_ref         0.1648
_reflns_number_gt                1344
_reflns_number_total             2448
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol062668%2Bsi20061101_080458.cif
_cod_data_source_block           ic11895
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/usr/data/users/saulius/automatic-downloads/retrospective/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_sg_symbol_H-M      Pbcn
_cod_database_code               1516657