5,10-dihydroxy-5<i>H</i>,10<i>H</i>-diimidazo[1,2-<i>a</i>:1',2'-<i>d</i>]pyrazine
Cheruzel, Lionel E.; Mashuta, Mark S.; Buchanan, Robert M.; Acta Crystallographica Section C 61 (2005) o361–o362; doi:10.1107/S0108270105010280

data_2014787
_publ_section_title
5,10-dihydroxy-5<i>H</i>,10<i>H</i>-diimidazo[1,2-<i>a</i>:1',2'-<i>d</i>]pyrazine
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o361
_journal_page_last               o362
_journal_paper_doi               10.1107/S0108270105010280
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'C8 H8 N4 O2'
_chemical_formula_moiety         'C8 H8 N4 O2'
_chemical_formula_sum            'C8 H8 N4 O2'
_chemical_formula_weight         192.18
_chemical_name_common
;
5,10-dihyhydroxy-5H,10H-diimidazo[1,2-a:1',2'-d]pyrazine
;
_chemical_name_systematic
;
5,10-dihyhydroxy-5H,10H-diimidazo[1,2-a:1',2'-d]pyrazine
;
_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                 100.615(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.6274(19)
_cell_length_b                   3.9625(11)
_cell_length_c                   15.260(4)
_cell_measurement_reflns_used    835
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      24.55
_cell_measurement_theta_min      2.71
_cell_volume                     393.89(19)
_computing_cell_refinement       'SAINT (Bruker, 2002)'
_computing_data_collection       'SMART (Bruker, 2002)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL (Bruker, 2001)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device_type  'Bruker SMART APEX CCD'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0206
_diffrn_reflns_av_sigmaI/netI    0.0274
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            3097
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.72
_diffrn_standards_decay_%        0.1
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.122
_exptl_absorpt_correction_T_max  0.989
_exptl_absorpt_correction_T_min  0.956
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS; Sheldrick, (1996).
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.620
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             200
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.244
_refine_diff_density_min         -0.181
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.081
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     78
_refine_ls_number_reflns         881
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_all          0.0476
_refine_ls_R_factor_gt           0.0355
_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^)+(0.0139P)^2^+0.291P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0680
_refine_ls_wR_factor_ref         0.0707
_reflns_number_gt                688
_reflns_number_total             881
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            dn1086.cif
_cod_data_source_block           I
_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_enum 1527 2010-12-29 10:47:43Z saulius 

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 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_Hall     '-P 2ybc '
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2014787
_cod_database_fobs_code          2014787