A new guaninate hydrate K^+^·C~5~H~4~N~5~O^{-^}·H~2~O: crystal structure from 100 to 300K in a comparison with 2Na^+^·C~5~H~3~N~5~O^2{-^}·7H~2~O
Gaydamaka, Anna A.; Arkhipov, Sergey G.; Boldyreva, Elena V.; Acta Crystallographica Section B 77 (2021) –; doi:10.1107/S205252062100754X

data_2108864
_publ_section_title
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 A new guaninate hydrate K^+^&#x00B7;C~5~H~4~N~5~O^{-^}&#x00B7;H~2~O:
 crystal structure from 100 to 300K in a comparison with
 2Na^+^&#x00B7;C~5~H~3~N~5~O^2{-^}&#x00B7;7H~2~O
;
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first
;
;
_journal_paper_doi               10.1107/S205252062100754X
_journal_volume                  77
_journal_year                    2021
_chemical_formula_moiety         '2(Na), 7(H2O), C5 H3 N5 O'
_chemical_formula_sum            'C5 H17 N5 Na2 O8'
_chemical_formula_weight         321.21
_chemical_name_common
'disodium 2-amino-6-oxo-6,7-dihydro-1H-purine-1,7-diide heptahydrate'
_chemical_name_systematic
'disodium 2-amino-6-oxo-6,7-dihydro-1H-purine-1,7-diide heptahydrate'
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   direct
_audit_creation_method           SHELXL-2018/3
_cell_angle_alpha                90
_cell_angle_beta                 101.563(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.5318(2)
_cell_length_b                   11.68404(19)
_cell_length_c                   11.1931(2)
_cell_measurement_reflns_used    7122
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      29.6090
_cell_measurement_theta_min      2.6760
_cell_volume                     1349.40(4)
_computing_cell_refinement       'STOE X-AREA (Stoe & Cie, 2006)'
_computing_data_collection       'STOE X-AREA (Stoe & Cie, 2006)'
_computing_data_reduction        'CrysAlisPro 1.171.38.43d (Rigaku OD, 2015)'
_computing_molecular_graphics
'Mercury (Macrae et al., 2020), Vesta(Momma,2011)'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 'image plate (34 cm diameter)'
_diffrn_detector_area_resol_mean 6.67
_diffrn_detector_type            STOE
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_details      ' 360 frames, detector distance = 100 mm'
_diffrn_measurement_device       '2-circle goniometer'
_diffrn_measurement_device_type  'STOE IPDS 2'
_diffrn_measurement_method       'rotation method'
_diffrn_radiation_collimation    '0.5 mm diameter, monocapillary'
_diffrn_radiation_monochromator  'plane graphite'
_diffrn_radiation_polarisn_norm  0
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0524
_diffrn_reflns_av_unetI/netI     0.0458
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            12926
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         29.569
_diffrn_reflns_theta_min         1.974
_diffrn_source
'sealed X-ray tube, 12 x 0.4 mm long-fine focus'
_diffrn_source_current           30
_diffrn_source_power             1.500
_diffrn_source_voltage           50
_exptl_absorpt_coefficient_mu    0.195
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.81534
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.39.46 (Rigaku Oxford Diffraction, 2018)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.581
_exptl_crystal_description       prism
_exptl_crystal_F_000             672
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.5
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.544
_refine_diff_density_min         -0.256
_refine_diff_density_rms         0.057
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    refxyz
_refine_ls_matrix_type           full
_refine_ls_number_parameters     232
_refine_ls_number_reflns         3781
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0400
_refine_ls_R_factor_gt           0.0319
_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^)+(0.0401P)^2^+0.6266P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0791
_refine_ls_wR_factor_ref         0.0877
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3058
_reflns_number_total             3781
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            xk5085sup1.cif
_cod_data_source_block           GuaNa_150K
_cod_original_cell_volume        1349.40(5)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2108864
_shelx_shelxl_version_number     2018/3
_oxdiff_exptl_absorpt_empirical_full_min 0.901
_oxdiff_exptl_absorpt_empirical_full_max 1.131
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
- Detector area scaling
;
_shelx_res_checksum              39862
_shelx_hkl_checksum              9307
_cod_database_fobs_code 2108864