Melaminium bis(hydrogen oxalate)
Zhang, Xiu-Lian; Chen, Xiao-Ming; Ng, Seik Weng; Acta Crystallographica Section E 61 (2005) o156–o157; doi:10.1107/S1600536804033239

data_2204925
_publ_section_title
;
 Melaminium bis(hydrogen oxalate)
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_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o156
_journal_page_last               o157
_journal_paper_doi               10.1107/S1600536804033239
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'C3 H8 N6 2+, 2C2 H O4 -'
_chemical_formula_moiety         'C3 H8 N6 2+, 2C2 H O4 -'
_chemical_formula_sum            'C7 H10 N6 O8'
_chemical_formula_weight         306.21
_chemical_name_systematic
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Melaminium(2+) di(hydrogen oxalate)
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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
_cell_angle_beta                 108.402(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   20.829(2)
_cell_length_b                   8.4280(10)
_cell_length_c                   6.8415(8)
_cell_measurement_reflns_used    1045
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      27.3
_cell_measurement_theta_min      3.3
_cell_volume                     1139.6(2)
_computing_cell_refinement       'SAINT (Bruker, 2002)'
_computing_data_collection       'SMART (Bruker, 2002)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.97
_diffrn_measurement_device_type  'Bruker APEX area-detector'
_diffrn_measurement_method       '\f and \w'
_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  0.019
_diffrn_reflns_av_sigmaI/netI    0.024
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -4
_diffrn_reflns_number            3287
_diffrn_reflns_theta_full        27.5
_diffrn_reflns_theta_max         27.5
_diffrn_reflns_theta_min         2.6
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.163
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.785
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             632
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.26
_refine_diff_density_min         -0.22
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.06
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     117
_refine_ls_number_reflns         1269
_refine_ls_number_restraints     5
_refine_ls_restrained_S_all      1.06
_refine_ls_R_factor_all          0.049
_refine_ls_R_factor_gt           0.041
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0711P)^2^+0.2079P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.110
_refine_ls_wR_factor_ref         0.116
_reflns_number_gt                1068
_reflns_number_total             1269
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            lh6334.cif
_cod_data_source_block           I
_cod_depositor_comments
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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.

'_exptl_absorpt_correction_type' value 'None' changed to
'none' 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.

'_exptl_absorpt_correction_type' value 'None' changed to
'none' 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_H-M      'C 2/c'
_cod_database_code               2204925
_cod_database_fobs_code          2204925