Cocrystals of pyrazine and benzene polycarboxylic acids
Dutkiewicz, Grzegorz; Dutkiewicz, Edward; Kubicki, Maciej; Acta Crystallographica Section C 74 (2018) 1420–1426; doi:10.1107/S2053229618013669

data_2021400
_publ_section_title
;
 Cocrystals of pyrazine and benzene polycarboxylic acids
;
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1420
_journal_page_last               1426
_journal_paper_doi               10.1107/S2053229618013669
_journal_volume                  74
_journal_year                    2018
_chemical_formula_iupac          '3C4 H4 N2, C10 H6 O8'
_chemical_formula_moiety         '3(C4 H4 N2), C10 H6 O8'
_chemical_formula_sum            'C22 H18 N6 O8'
_chemical_formula_weight         494.42
_chemical_name_common
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Pyrazine--pyromellitic acid (3/1)
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_chemical_name_systematic
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Pyrazine--benzene-1,2,4,5-tetracarboxylic acid (3/1)
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   difmap
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 96.967(9)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   7.0481(7)
_cell_length_b                   22.365(2)
_cell_length_c                   7.2120(7)
_cell_measurement_reflns_used    1334
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      26.1170
_cell_measurement_theta_min      3.9380
_cell_volume                     1128.44(19)
_computing_cell_refinement
;
CrysAlis PRO (Rigaku OD, 2015)
;
_computing_data_collection
;
CrysAlis PRO (Rigaku OD, 2015)
;
_computing_data_reduction
;
CrysAlis PRO (Rigaku OD, 2015)
;
_computing_molecular_graphics
;
Mercury (Macrae <i>et al.</i>,  2008)
;
_computing_publication_material
;
SHELXL2014 (Sheldrick, 2015b)
;
_computing_structure_refinement
;
SHELXL2014 (Sheldrick, 2015b)
;
_computing_structure_solution
;
SHELXT (Sheldrick, 2015a)
;
_diffrn_ambient_temperature      295(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 16.2413
_diffrn_detector_type            Eos
_diffrn_measured_fraction_theta_full 0.963
_diffrn_measured_fraction_theta_max 0.921
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'Rigaku Xcalibur Eos'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0200
_diffrn_reflns_av_unetI/netI     0.0358
_diffrn_reflns_Laue_measured_fraction_full 0.963
_diffrn_reflns_Laue_measured_fraction_max 0.921
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            4092
_diffrn_reflns_point_group_measured_fraction_full 0.963
_diffrn_reflns_point_group_measured_fraction_max 0.921
_diffrn_reflns_theta_full        26.000
_diffrn_reflns_theta_max         26.566
_diffrn_reflns_theta_min         3.379
_diffrn_source                   'fine-focus sealed X-ray tube'
_diffrn_source_type              'Enhance (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.114
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.93281
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(CrysAlis PRO; Rigaku OD, 2015)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.455
_exptl_crystal_description       block
_exptl_crystal_F_000             512
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.3
_refine_diff_density_max         0.258
_refine_diff_density_min         -0.189
_refine_diff_density_rms         0.040
_refine_ls_extinction_coef       0.080(5)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method
;
SHELXL2014 (Sheldrick, 2015b)
;
_refine_ls_goodness_of_fit_ref   1.022
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     200
_refine_ls_number_reflns         2160
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.022
_refine_ls_R_factor_all          0.0552
_refine_ls_R_factor_gt           0.0406
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0431P)^2^+0.2031P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0913
_refine_ls_wR_factor_ref         0.1028
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1695
_reflns_number_total             2160
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            yp3167sup1.cif
_cod_data_source_block           3
_cod_database_code               2021400
_cod_database_fobs_code          2021400
_shelx_shelxl_version_number     2014/7
_exptl_absorpt_special_details
;
CrysAlisPro 1.171.38.46 (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_shelx_res_checksum              92908
_shelx_hkl_checksum              49019