Origin of spontaneous polarization and reconstructive phase transition in guanidinium iodide
Szafrański, Marek; Jarek, Marcin; CrystEngComm 15 (2013) 4617–; doi:10.1039/c3ce26979e

data_7210075
_publ_section_title
;
 Origin of spontaneous polarization and reconstructive phase transition in
 guanidinium iodide
;
_journal_issue                   23
_journal_name_full               CrystEngComm
_journal_page_first              4617
_journal_paper_doi               10.1039/c3ce26979e
_journal_volume                  15
_journal_year                    2013
_chemical_formula_sum            'C H6 I N3'
_chemical_formula_weight         186.99
_chemical_melting_point          460(5)
_chemical_name_common            'guanidinium iodide'
_chemical_name_systematic
;
?
;
_space_group_IT_number           11
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yb'
_symmetry_space_group_name_H-M   'P 1 21/m 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                 96.7315(17)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   5.23783(9)
_cell_length_b                   7.54922(14)
_cell_length_c                   6.98292(13)
_cell_measurement_temperature    360.0(1)
_cell_volume                     274.212(9)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      360.0(1)
_diffrn_measured_fraction_theta_full 0.978
_diffrn_measured_fraction_theta_max 0.978
_diffrn_measurement_device_type  'Gemini A Ultra'
_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  0.0246
_diffrn_reflns_av_sigmaI/netI    0.0110
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            6886
_diffrn_reflns_theta_full        32.09
_diffrn_reflns_theta_max         32.09
_diffrn_reflns_theta_min         2.94
_exptl_absorpt_coefficient_mu    5.692
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.70091
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrysalisPro (Oxford Diffraction 2010)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    2.265
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             172
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.403
_refine_diff_density_min         -0.489
_refine_diff_density_rms         0.083
_refine_ls_extinction_coef       0.347(10)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.089
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     29
_refine_ls_number_reflns         999
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.089
_refine_ls_R_factor_all          0.0259
_refine_ls_R_factor_gt           0.0232
_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^)+(0.0260P)^2^+0.1009P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0563
_refine_ls_wR_factor_ref         0.0583
_reflns_number_gt                909
_reflns_number_total             999
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3ce26979e.txt
_cod_data_source_block           gi_htp_360
_cod_original_sg_symbol_H-M      P2(1)/m
_cod_database_code               7210075