Adjacent N→ O and C–NH2 groups — a highly efficient amphoteric structure for energetic materials resulting from tautomerization proved by crystal engineering
Feng, Zhicun; Zhang, Yu; Li, Yanan; Xu, Kangzhen; CrystEngComm 23 (2021) 1544–1549; doi:10.1039/D0CE01427C

data_7242139
_publ_section_title
;
 Adjacent N\\rightarrow O and C--NH2 groups --- a highly efficient
 amphoteric structure for energetic materials resulting from
 tautomerization proved by crystal engineering
;
_journal_issue                   7
_journal_name_full               CrystEngComm
_journal_page_first              1544
_journal_page_last               1549
_journal_paper_doi               10.1039/D0CE01427C
_journal_volume                  23
_journal_year                    2021
_chemical_formula_sum            'C3 H5 K N6 O2'
_chemical_formula_weight         196.23
_chemical_name_systematic
'potassium 4,6-diamino-2-imino-3-oxido-2,3-dihydro-1,3,5-triazine-1-oxide'
_space_group_crystal_system      orthorhombic
_space_group_IT_number           33
_space_group_name_Hall           'P 2c -2n'
_space_group_name_H-M_alt        'P n a 21'
_atom_sites_solution_hydrogens   difmap
_audit_creation_method           SHELXL-2013
_audit_update_record
;
2019-12-18 deposited with the CCDC.	2021-01-19 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   13.776(7)
_cell_length_b                   3.764(2)
_cell_length_c                   12.796(6)
_cell_measurement_reflns_used    384
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      20.42
_cell_measurement_theta_min      3.18
_cell_volume                     663.5(6)
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Bruker Smart Apex CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1101
_diffrn_reflns_av_unetI/netI     0.1542
_diffrn_reflns_Laue_measured_fraction_full 0.995
_diffrn_reflns_Laue_measured_fraction_max 0.994
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       4
_diffrn_reflns_limit_k_min       -4
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            3384
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.995
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.426
_diffrn_reflns_theta_min         3.184
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.766
_exptl_absorpt_correction_T_max  0865
_exptl_absorpt_correction_T_min  0.824
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.964
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             400
_exptl_crystal_size_max          0.520
_exptl_crystal_size_mid          0.210
_exptl_crystal_size_min          0.190
_refine_diff_density_max         0.424
_refine_diff_density_min         -0.480
_refine_diff_density_rms         0.101
_refine_ls_abs_structure_details
;
 Refined as an inversion twin.
;
_refine_ls_abs_structure_Flack   0.25(15)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.833
_refine_ls_hydrogen_treatment    refxyz
_refine_ls_matrix_type           full
_refine_ls_number_parameters     125
_refine_ls_number_reflns         1138
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      0.831
_refine_ls_R_factor_all          0.0911
_refine_ls_R_factor_gt           0.0507
_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^)]
 where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0764
_refine_ls_wR_factor_ref         0.0876
_reflns_Friedel_coverage         0.913
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.995
_reflns_number_gt                713
_reflns_number_total             1138
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0ce01427c2.cif
_cod_data_source_block           xb2638_0ma_a
_cod_depositor_comments
'Adding full bibliography for 7242134--7242143.cif.'
_cod_database_code               7242139
_shelx_estimated_absorpt_t_min   0.692
_shelx_estimated_absorpt_t_max   0.868
_shelxl_version_number           2013-2
_shelx_res_checksum              56115