Crystal structures, phase transitions, and switchable dielectric behaviors: comparison of a series of N-heterocyclic ammonium perchlorates.
Shi, Ping-Ping; Ye, Qiong; Li, Qiang; Wang, Hui-Ting; Fu, Da-Wei; Zhang, Yi; Xiong, Ren-Gen; Dalton transactions (Cambridge, England : 2003) 44 (2015) 8221–8231; doi:10.1039/c5dt00263j

data_7034595
_publ_section_title
;
 Crystal structures, phase transitions, and switchable dielectric
 behaviors: comparison of a series of N-heterocyclic ammonium
 perchlorates.
;
_journal_issue                   17
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              8221
_journal_page_last               8231
_journal_paper_doi               10.1039/c5dt00263j
_journal_volume                  44
_journal_year                    2015
_chemical_formula_sum            'C8 H15 Cl N2 O4'
_chemical_formula_weight         238.67
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2014-07-02 deposited with the CCDC.
2015-03-24 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 94.94(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.7088(15)
_cell_length_b                   11.933(2)
_cell_length_c                   12.458(3)
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25.00
_cell_measurement_theta_min      3.00
_cell_volume                     1141.7(4)
_computing_cell_refinement       '<i>CrystalClear</i> (Rigaku, 2005)'
_computing_data_collection       '<i>CrystalClear</i> (Rigaku, 2005)'
_computing_data_reduction        '<i>CrystalClear</i> (Rigaku, 2005)'
_computing_molecular_graphics    '<i>SHELXTL</i> (Sheldrick, 2008)'
_computing_publication_material  '<i>PRPKAPPA</i> (Ferguson, 1999)'
_computing_structure_refinement  '<i>SHELXL-97</i> (Sheldrick, 2008)'
_computing_structure_solution    '<i>SHELXS-97</i> (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 13.6612
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Mercury2 (2x2 bin mode)'
_diffrn_measurement_method       CCD_Profile_fitting
_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  0.0499
_diffrn_reflns_av_sigmaI/netI    0.0340
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            9546
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.00
_exptl_absorpt_coefficient_mu    0.332
_exptl_absorpt_correction_T_max  0.936
_exptl_absorpt_correction_T_min  0.936
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '<i>CrystalClear</i> (Rigaku, 2005)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.388
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             504
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.850
_refine_diff_density_min         -0.481
_refine_diff_density_rms         0.096
_refine_ls_extinction_coef       0.075(11)
_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   1.071
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     137
_refine_ls_number_reflns         2007
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.071
_refine_ls_R_factor_all          0.0809
_refine_ls_R_factor_gt           0.0751
_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^)+(0.1348P)^2^+1.1698P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2120
_refine_ls_wR_factor_ref         0.2191
_reflns_number_gt                1785
_reflns_number_total             2007
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c5dt00263j2.cif
_cod_data_source_block           1
_cod_depositor_comments
'Adding full bibliography for 7034594--7034596.cif.'
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7034595