Exploring the structural landscape of 2-aminopyrazines via co-crystallizations
Aakeröy, Christer B.; Chopade, Prashant D.; Ganser, Claudia; Rajbanshi, Arbin; Desper, John; CrystEngComm 14 (2012) 5845–; doi:10.1039/c2ce25516b

data_7208513
_publ_section_title
;
 Exploring the structural landscape of 2-aminopyrazines via
 co-crystallizations
;
_journal_issue                   18
_journal_name_full               CrystEngComm
_journal_page_first              5845
_journal_paper_doi               10.1039/c2ce25516b
_journal_volume                  14
_journal_year                    2012
_chemical_formula_moiety
;
(C4 H5 N3) (C7 H5 N O4)2
;
_chemical_formula_sum            'C18 H15 N5 O8'
_chemical_formula_weight         429.35
_chemical_name_systematic
;
P50 2-aminopyrazine, (4-NO2-PhCOOH)2
;
_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   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 101.948(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   13.8994(7)
_cell_length_b                   5.4845(3)
_cell_length_c                   13.1317(6)
_cell_measurement_reflns_used    2139
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      24.72
_cell_measurement_theta_min      3.78
_cell_volume                     979.36(9)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \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  0.0516
_diffrn_reflns_av_sigmaI/netI    0.0515
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            12104
_diffrn_reflns_theta_full        32.65
_diffrn_reflns_theta_max         32.65
_diffrn_reflns_theta_min         3.78
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.117
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.456
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             444
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.203
_refine_diff_density_min         -0.315
_refine_diff_density_rms         0.040
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.055
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     179
_refine_ls_number_reflns         3529
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.055
_refine_ls_R_factor_all          0.1557
_refine_ls_R_factor_gt           0.0707
_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^)+(0.0850P)^2^+0.1500P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1821
_refine_ls_wR_factor_ref         0.2208
_reflns_number_gt                1564
_reflns_number_total             3529
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ce25516b.txt
_cod_data_source_block           B1.A11
_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_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7208513