Mechanochemical synthesis of pyrazine:dicarboxylic acid cocrystals and a study of dissociation by quantitative phase analysis
Arhangelskis, Mihails; Lloyd, Gareth O.; Jones, William; CrystEngComm 14 (2012) 5203–; doi:10.1039/c2ce25121c

data_7208190
_publ_section_title
;
 Mechanochemical synthesis of pyrazine:dicarboxylic acid cocrystals and a
 study of dissociation by quantitative phase analysis
;
_journal_issue                   16
_journal_name_full               CrystEngComm
_journal_page_first              5203
_journal_paper_doi               10.1039/c2ce25121c
_journal_volume                  14
_journal_year                    2012
_chemical_formula_moiety         'C4 H6 O4, C4 H4 N2'
_chemical_formula_sum            'C8 H10 N2 O4'
_chemical_formula_weight         198.18
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 103.012(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   8.5311(4)
_cell_length_b                   5.1286(2)
_cell_length_c                   10.2947(5)
_cell_measurement_reflns_used    2378
_cell_measurement_temperature    120
_cell_measurement_theta_max      71.7780
_cell_measurement_theta_min      4.4044
_cell_volume                     438.85(4)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
;
_computing_data_collection
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
;
_computing_data_reduction
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
;
_computing_molecular_graphics    Xseed
_computing_publication_material  Xseed
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Xcalibur, Eos, Gemini ultra'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_source         'Enhance Ultra (Cu) X-ray Source'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.5418
_diffrn_reflns_av_R_equivalents  0.0461
_diffrn_reflns_av_sigmaI/netI    0.0276
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            2561
_diffrn_reflns_theta_full        71.92
_diffrn_reflns_theta_max         71.92
_diffrn_reflns_theta_min         6.10
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.043
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.70103
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.34.49 (release 20-01-2011 CrysAlis171 .NET)
(compiled Jan 20 2011,15:58:25)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.500
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             208
_exptl_crystal_size_max          0.4820
_exptl_crystal_size_mid          0.3321
_exptl_crystal_size_min          0.1818
_refine_diff_density_max         0.395
_refine_diff_density_min         -0.403
_refine_diff_density_rms         0.088
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     65
_refine_ls_number_reflns         860
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0529
_refine_ls_R_factor_gt           0.0509
_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^)+(0.0972P)^2^+0.1414P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1348
_refine_ls_wR_factor_ref         0.1368
_reflns_number_gt                817
_reflns_number_total             860
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ce25121c.txt
_cod_data_source_block           2
_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_cell_volume        438.85(3)
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               7208190