Effect of high pressure on the supramolecular structures of guanidinium based ferroelectrics
Szafrański, Marek; CrystEngComm  (2014) –; doi:10.1039/c4ce00697f

data_7215996
_publ_section_title
;
 Effect of high pressure on the supramolecular structures of guanidinium
 based ferroelectrics
;
_journal_name_full               CrystEngComm
_journal_paper_doi               10.1039/c4ce00697f
_journal_year                    2014
_chemical_formula_moiety         'C H6 N3, Cl O4'
_chemical_formula_sum            'C H6 Cl N3 O4'
_chemical_formula_weight         159.54
_chemical_melting_point          526(2)
_chemical_name_common            'guanidinium perchlorate'
_chemical_name_systematic        'guanidinium perchlorate'
_space_group_IT_number           160
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  'R 3 -2"'
_symmetry_space_group_name_H-M   'R 3 m :H'
_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                 90.00
_cell_angle_gamma                120.00
_cell_formula_units_Z            3
_cell_length_a                   7.5595(6)
_cell_length_b                   7.5595(6)
_cell_length_c                   8.7694(10)
_cell_measurement_reflns_used    575
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      26.803
_cell_measurement_theta_min      3.853
_cell_volume                     434.00(7)
_computing_cell_refinement       CrysAlisRED
_computing_data_collection       CrysAlisCCD
_computing_data_reduction        CrysAlisRED
_computing_molecular_graphics    'SHELXL-97 (Sheldrick, 1997)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_environment      'diamond-anvil cell'
_diffrn_ambient_pressure         380000
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.534
_diffrn_measured_fraction_theta_max 0.534
_diffrn_measurement_device_type  'Gemini A Ultra'
_diffrn_measurement_method       '\f- and \w-scans'
_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  0.0551
_diffrn_reflns_av_sigmaI/netI    0.0343
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            553
_diffrn_reflns_theta_full        26.85
_diffrn_reflns_theta_max         26.85
_diffrn_reflns_theta_min         6.65
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.610
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.831
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             246
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.23
_refine_diff_density_max         0.185
_refine_diff_density_min         -0.259
_refine_diff_density_rms         0.047
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.4(4)
_refine_ls_extinction_coef       0.12(5)
_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   1.290
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     23
_refine_ls_number_reflns         141
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.285
_refine_ls_R_factor_all          0.0625
_refine_ls_R_factor_gt           0.0562
_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^)+(0.0000P)^2^+3.8724P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1191
_refine_ls_wR_factor_ref         0.1295
_reflns_number_gt                134
_reflns_number_total             141
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4ce00697f1.cif
_cod_data_source_block           gclo4_0_38
_cod_original_sg_symbol_H-M      'R 3 m'
_cod_database_code               7215996