2,5-Di(aryleneethynyl)pyrazine derivatives: synthesis, structural and optoelectronic properties, and light-emitting device
Zhao, Liang; Perepichka, Igor F.; Türksoy, Figen; Batsanov, Andrei S.; Beeby, Andrew; Findlay, Karen S.; Bryce, Martin R.; New Journal of Chemistry 28 (2004) 912–918; doi:10.1039/B401867M

data_7050322
_publ_section_title
;
 2,5-Di(aryleneethynyl)pyrazine derivatives: synthesis, structural
 and optoelectronic properties, and light-emitting device
;
_journal_issue                   8
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              912
_journal_page_last               918
_journal_paper_doi               10.1039/B401867M
_journal_volume                  28
_journal_year                    2004
_chemical_formula_moiety         'C22 H16 N2'
_chemical_formula_sum            'C22 H16 N2'
_chemical_formula_weight         308.37
_chemical_melting_point          462.5(5)
_chemical_name_common            2,5-dimethyl-3,6-bis-phenylethynylpyrazine
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 92.33(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.059(1)
_cell_length_b                   7.515(1)
_cell_length_c                   12.102(4)
_cell_measurement_reflns_used    727
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      26.6
_cell_measurement_theta_min      12.0
_cell_volume                     823.2(3)
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 8
_diffrn_measurement_device_type  'SMART 6K CCD area detector'
_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  0.0391
_diffrn_reflns_av_sigmaI/netI    0.0242
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            10887
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.25
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  ?
_exptl_absorpt_correction_T_min  ?
_exptl_absorpt_correction_type   none
_exptl_absorpt_process_details   ?
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.244
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       'rhombic plate'
_exptl_crystal_F_000             324
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.06
_refine_ls_extinction_coef       ?
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     141
_refine_ls_number_reflns         1891
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0514
_refine_ls_R_factor_gt           0.0383
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0651P)^2^+0.0794P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1049
_refine_ls_wR_factor_ref         0.1145
_reflns_number_gt                1465
_reflns_number_total             1891
_reflns_threshold_expression     I>2\s(I)
_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 

The following automatic conversions were performed:

'_chemical_melting_point' value '462--463 K' was changed to
'462.5(5)' - the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
;
_cod_original_sg_symbol_H-M      'P 21/c '
_cod_database_code               7050322