First structural characterization of guanidine, HN=C(NH(2))(2).
Göbel, Michael; Klapötke, Thomas M; Chemical communications (Cambridge, England)  (2007) 3180–3182; doi:10.1039/b705100j

data_7102056
_publ_section_title
;
 First structural characterization of guanidine, HN=C(NH(2))(2).
;
_journal_issue                   30
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              3180
_journal_page_last               3182
_journal_paper_doi               10.1039/b705100j
_journal_year                    2007
_chemical_formula_sum            'C7 H18 N10'
_chemical_formula_weight         242.31
_chemical_name_common            '2-amino-4,6-dimethyl-triazine * 2 guanidine'
_chemical_name_systematic        '2-amino-4,6-dimethyl-triazine * 2 guanidine'
_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                 96.373(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.5743(2)
_cell_length_b                   23.7968(7)
_cell_length_c                   7.8931(2)
_cell_measurement_temperature    100(2)
_cell_volume                     1227.22(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Oxford Xcalibur3 CCD'
_diffrn_measurement_method       omega-scan
_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  0.0385
_diffrn_reflns_av_sigmaI/netI    0.0356
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       28
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            12408
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.93
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.311
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             520
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.201
_refine_diff_density_min         -0.247
_refine_diff_density_rms         0.046
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.028
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     204
_refine_ls_number_reflns         2148
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.028
_refine_ls_R_factor_all          0.0690
_refine_ls_R_factor_gt           0.0412
_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^)+(0.0632P)^2^+0.2092P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0986
_refine_ls_wR_factor_ref         0.1136
_reflns_number_gt                1507
_reflns_number_total             2148
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b705100j.txt
_cod_data_source_block           cx001
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7102056