1,4-Bis(<i>p</i>-tolylethynyl)benzene
Filatov, Alexander S.; Petrukhina, Marina A.; Acta Crystallographica Section C 61 (2005) o193–o194; doi:10.1107/S0108270105000983

data_2014698
_publ_section_title
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 1,4-Bis(<i>p</i>-tolylethynyl)benzene
;
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o193
_journal_page_last               o194
_journal_paper_doi               10.1107/S0108270105000983
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'C24 H18'
_chemical_formula_moiety         'C24 H18'
_chemical_formula_sum            'C24 H18'
_chemical_formula_weight         306.38
_chemical_melting_point          493
_chemical_name_systematic
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1,4-Bis(p-tolylethynyl)benzene
;
_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
_cell_angle_beta                 100.7110(10)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   14.5478(11)
_cell_length_b                   4.9229(4)
_cell_length_c                   11.3006(9)
_cell_measurement_reflns_used    3277
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      28.25
_cell_measurement_theta_min      2.35
_cell_volume                     795.22(11)
_computing_cell_refinement       SMART
_computing_data_collection       'SMART (Bruker, 1999)'
_computing_data_reduction        'SAINT (Bruker, 1999)'
_computing_molecular_graphics
'ORTEP-3 for Windows (Farrugia, 1997) and SHELXTL (Bruker, 1997)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.942
_diffrn_measurement_device_type  'Bruker SMART APEX CCD area-detector'
_diffrn_measurement_method       '0.3\% wide \w exposures'
_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  0.0344
_diffrn_reflns_av_sigmaI/netI    0.0285
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            6512
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         28.25
_diffrn_reflns_theta_min         1.42
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.072
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.280
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             324
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.276
_refine_diff_density_min         -0.219
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.015
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     145
_refine_ls_number_reflns         1863
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.015
_refine_ls_R_factor_all          0.0577
_refine_ls_R_factor_gt           0.0449
_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^)+(0.095P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1374
_refine_ls_wR_factor_ref         0.1438
_reflns_number_gt                1358
_reflns_number_total             1863
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            gg1238.cif
_cod_data_source_block           I
_cod_depositor_comments
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The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2014698
_cod_database_fobs_code          2014698