In situ co-crystallisation as a tool for low-temperature crystal engineering
Andrew Bond; Chemical communications (Cambridge, England)  (2003) –; doi:10.1039/b208904a

data_7103920
_publ_section_title
;
In situ co-crystallisation as a tool for
low-temperature crystal engineering
;
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_paper_doi               10.1039/b208904a
_journal_year                    2003
_chemical_formula_moiety         'C4 H4 N2, 2(C H2 O2)'
_chemical_formula_sum            'C6 H8 N2 O4'
_chemical_formula_weight         172.14
_chemical_name_common            'pyrazine / formic acid'
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 96.068(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   3.6994(1)
_cell_length_b                   7.0340(3)
_cell_length_c                   16.1607(9)
_cell_measurement_reflns_used    3743
_cell_measurement_temperature    180(2)
_cell_measurement_theta_max      25.35
_cell_measurement_theta_min      1.02
_cell_volume                     418.17(3)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor, 1997)'
_computing_data_collection       'Collect (Nonius, 1998)'
_computing_data_reduction
;
HKL Denzo and Scalepack (Otwinowski & Minor, 1997)
;
_computing_publication_material  'SHELXTL v6.12 (Bruker AXS, 2001)'
_computing_structure_refinement  'SHELXTL v6.12 (Bruker AXS, 2001)'
_computing_structure_solution    'SIR-92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      180(2)
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       'Thin slice \w and \f scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.7107
_diffrn_reflns_av_R_equivalents  0.1556
_diffrn_reflns_av_sigmaI/netI    0.0862
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            2895
_diffrn_reflns_theta_full        25.32
_diffrn_reflns_theta_max         25.32
_diffrn_reflns_theta_min         3.85
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.116
_exptl_absorpt_correction_T_max  0.9771
_exptl_absorpt_correction_T_min  0.9604
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.367
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       cylinder
_exptl_crystal_F_000             180
_exptl_crystal_size_length       0.35
_exptl_crystal_size_rad          0.10
_refine_diff_density_max         0.334
_refine_diff_density_min         -0.236
_refine_diff_density_rms         0.066
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.107
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     59
_refine_ls_number_reflns         760
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.107
_refine_ls_R_factor_all          0.0787
_refine_ls_R_factor_gt           0.0723
_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^)+(0.1003P)^2^+0.0876P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1839
_refine_ls_wR_factor_ref         0.1925
_reflns_number_gt                661
_reflns_number_total             760
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            b208904a.txt
_cod_data_source_block           ab0210
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7103920