Homo- or Heterosynthon? A Crystallographic Study on a Series of New Cocrystals Derived from Pyrazinecarboxamide and Various Carboxylic Acids Equipped with Additional Hydrogen Bonding Sites
Adalder, Tapas Kumar; Sankolli, Ravish; Dastidar, Parthasarathi; Crystal Growth & Design 12 (2012) 2533–; doi:10.1021/cg300140w

data_4506053
_publ_section_title
;
 Homo- or Heterosynthon? A Crystallographic Study on a Series of New
 Cocrystals Derived from Pyrazinecarboxamide and Various Carboxylic Acids
 Equipped with Additional Hydrogen Bonding Sites
;
_journal_issue                   5
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              2533
_journal_paper_doi               10.1021/cg300140w
_journal_volume                  12
_journal_year                    2012
_chemical_formula_sum            'C13 H13 N3 O5'
_chemical_formula_weight         291.26
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                88.959(7)
_cell_angle_beta                 87.126(8)
_cell_angle_gamma                66.359(8)
_cell_formula_units_Z            4
_cell_length_a                   7.424(7)
_cell_length_b                   7.628(7)
_cell_length_c                   25.70(2)
_cell_measurement_temperature    100(2)
_cell_volume                     1332(2)
_computing_cell_refinement       'Bruker Apex II'
_computing_data_collection       'Bruker Apex II'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'Mercury 2.3'
_computing_publication_material  Shelxl-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 3
_diffrn_measured_fraction_theta_full 0.965
_diffrn_measured_fraction_theta_max 0.965
_diffrn_measurement_device_type  'Bruker Apex II'
_diffrn_measurement_method       'Omega scan'
_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  0.0256
_diffrn_reflns_av_sigmaI/netI    0.0306
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            11494
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         7.67
_exptl_absorpt_coefficient_mu    0.114
_exptl_absorpt_correction_T_max  0.9865
_exptl_absorpt_correction_T_min  0.9645
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.453
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             608
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.177
_refine_diff_density_min         -0.143
_refine_diff_density_rms         0.028
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.971
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     385
_refine_ls_number_reflns         4519
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.971
_refine_ls_R_factor_all          0.0580
_refine_ls_R_factor_gt           0.0395
_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^)+(0.0855P)^2^+0.0339P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1121
_refine_ls_wR_factor_ref         0.1283
_reflns_number_gt                3332
_reflns_number_total             4519
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg300140w_si_002.cif
_cod_data_source_block           y
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               4506053