Pyrazine-2-carbohydrazide: a three-dimensional hydrogen-bonded framework structure
Wardell, Solange M. S. V.; de Souza, Marcus V. N.; Wardell, James L.; Low, John N.; Glidewell, Christopher; Acta Crystallographica Section E 62 (2006) o3765–o3767; doi:10.1107/S1600536806029394

data_2210412
_publ_section_title
;
 Pyrazine-2-carbohydrazide: a three-dimensional hydrogen-bonded
 framework structure
;
_journal_coeditor_code           WN2053
_journal_issue                   9
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o3765
_journal_page_last               o3767
_journal_paper_doi               10.1107/S1600536806029394
_journal_volume                  62
_journal_year                    2006
_chemical_formula_iupac          'C5 H6 N4 O'
_chemical_formula_moiety         'C5 H6 N4 O'
_chemical_formula_sum            'C5 H6 N4 O'
_chemical_formula_weight         138.14
_chemical_name_systematic
;
Pyrazine-2-carbohydrazide
;
_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                 99.185(8)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   3.7193(5)
_cell_length_b                   16.978(2)
_cell_length_c                   9.7858(10)
_cell_measurement_reflns_used    1395
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      4.17
_cell_volume                     610.01(13)
_computing_cell_refinement       'DENZO (Otwinowski & Minor, 1997) and COLLECT'
_computing_data_collection       'COLLECT (Hooft, 1999)'
_computing_data_reduction        'DENZO and COLLECT'
_computing_molecular_graphics    'PLATON (Spek, 2003)'
_computing_publication_material  'SHELXL97 and PRPKAPPA (Ferguson, 1999)'
_computing_structure_refinement  'OSCAIL and SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution
'OSCAIL (McArdle, 2003) and SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 9.091
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker--Nonius KappaCCD'
_diffrn_measurement_method       '\f and \w'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Bruker--Nonius FR591 rotating anode'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0571
_diffrn_reflns_av_sigmaI/netI    0.0527
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            6568
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         4.17
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.113
_exptl_absorpt_correction_T_max  0.999
_exptl_absorpt_correction_T_min  0.965
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2003)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.504
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             288
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.198
_refine_diff_density_min         -0.240
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.082
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     91
_refine_ls_number_reflns         1395
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.082
_refine_ls_R_factor_all          0.0812
_refine_ls_R_factor_gt           0.0593
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0462P)^2^+0.4947P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1305
_refine_ls_wR_factor_ref         0.1384
_reflns_number_gt                1080
_reflns_number_total             1395
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            wn2053.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2210412
_cod_database_fobs_code          2210412