An orthorhombic polymorph of naphthalene-2,3-dicarbonitrile
Tamil Selvi Pitchumony; Helen Stoeckli-Evans; Acta Crystallographica Section E 61 (2005) o40–o41; doi:10.1107/S1600536804031757

data_2204970
_publ_section_title
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 An orthorhombic polymorph of naphthalene-2,3-dicarbonitrile
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_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o40
_journal_page_last               o41
_journal_paper_doi               10.1107/S1600536804031757
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'C12 H6 N2'
_chemical_formula_moiety         'C12 H6 N2'
_chemical_formula_sum            'C12 H6 N2'
_chemical_formula_weight         178.19
_chemical_name_systematic
;
naphthalene-2,3-dicarbonitrile
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   difmap
_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                   3.8144(5)
_cell_length_b                   12.175(2)
_cell_length_c                   18.806(3)
_cell_measurement_reflns_used    6447
_cell_measurement_temperature    153(2)
_cell_measurement_theta_max      26.07
_cell_measurement_theta_min      1.67
_cell_volume                     873.4(2)
_computing_cell_refinement       X-AREA
_computing_data_collection       'X-AREA (Stoe & Cie, 2004)'
_computing_data_reduction        'X-RED32 (Stoe & Cie, 2004)'
_computing_molecular_graphics    'PLATON  (Spek, 2003)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      153(2)
_diffrn_detector_area_resol_mean 0.81\%A
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device       '2-circle goniometer'
_diffrn_measurement_device_type  'Stoe IPDS-II'
_diffrn_measurement_method       '\f or \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  0.0659
_diffrn_reflns_av_sigmaI/netI    0.0319
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            6296
_diffrn_reflns_theta_full        26.07
_diffrn_reflns_theta_max         26.07
_diffrn_reflns_theta_min         1.99
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.355
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             368
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.118
_refine_diff_density_min         -0.142
_refine_ls_abs_structure_details 'none; Friedel pairs merged'
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.869
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     151
_refine_ls_number_reflns         1054
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.869
_refine_ls_R_factor_all          0.0435
_refine_ls_R_factor_gt           0.0373
_refine_ls_shift/su_max          <0.001
_refine_ls_shift/su_mean         <0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w1/[\s^2^(Fo^2^)+(0.0678P)^2^] where P(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0991
_refine_ls_wR_factor_ref         0.1048
_reflns_number_gt                915
_reflns_number_total             1054
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sj6037.cif
_cod_data_source_block           I
_cod_depositor_comments
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The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'none' 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 
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_cod_database_code               2204970
_cod_database_fobs_code          2204970