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_7208516
_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)2 (C4 H6 O4)
;
_chemical_formula_sum            'C12 H16 N6 O4'
_chemical_formula_weight         308.31
_chemical_name_systematic
;
D3 2-aminopyrazine, HOOC-(CH2)2-COOH
;
_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                 104.487(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   5.3982(9)
_cell_length_b                   19.505(3)
_cell_length_c                   6.9524(12)
_cell_measurement_reflns_used    2227
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      30.32
_cell_measurement_theta_min      3.20
_cell_volume                     708.8(2)
_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      120(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_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  0.1043
_diffrn_reflns_av_sigmaI/netI    0.0977
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            12115
_diffrn_reflns_theta_full        30.50
_diffrn_reflns_theta_max         30.50
_diffrn_reflns_theta_min         2.09
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.112
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.445
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             324
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.736
_refine_diff_density_min         -0.433
_refine_diff_density_rms         0.157
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.486
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     109
_refine_ls_number_reflns         2141
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.486
_refine_ls_R_factor_all          0.2198
_refine_ls_R_factor_gt           0.1548
_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^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2756
_refine_ls_wR_factor_ref         0.2946
_reflns_number_gt                1230
_reflns_number_total             2141
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ce25516b.txt
_cod_data_source_block           B1.A23
_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               7208516