Ferroelectricity Induced by Ordering of Twisting Motion in a Molecular Rotor
Yi Zhang; Wen Zhang; Shen-Hui Li; Qiong Ye; Hong-Ling Cai; Feng Deng; Ren-Gen Xiong; Songping D. Huang; Journal of the American Chemical Society 134 (2012) 11044–11049; doi:10.1021/ja3047427

data_4118200
_publ_section_title
;
 Ferroelectricity Induced by Ordering of Twisting Motion in a Molecular
 Rotor
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              11044
_journal_page_last               11049
_journal_paper_doi               10.1021/ja3047427
_journal_volume                  134
_journal_year                    2012
_chemical_formula_moiety         'C6 H15 Cl3 Cu N2 O'
_chemical_formula_sum            'C6 H15 Cl3 Cu N2 O'
_chemical_formula_weight         301.09
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           62
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2n'
_symmetry_space_group_name_H-M   'P n m a'
_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                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.729(3)
_cell_length_b                   9.0410(18)
_cell_length_c                   7.7954(16)
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      3.04
_cell_volume                     1108.6(4)
_computing_cell_refinement       CrystalClear
_computing_data_collection       'CrystalClear (Rigaku 2005)'
_computing_data_reduction        CrystalClear
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'PRPKAPPA (Ferguson, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      298(2)
_diffrn_detector_area_resol_mean 13.6612
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Rigaku SCXmini diffractometer'
_diffrn_measurement_method       '\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  0.0503
_diffrn_reflns_av_sigmaI/netI    0.0271
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            10841
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.43
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    2.657
_exptl_absorpt_correction_T_max  0.594
_exptl_absorpt_correction_T_min  0.588
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrystalClear (Rigaku, 2005)'
_exptl_crystal_colour            green
_exptl_crystal_density_diffrn    1.804
_exptl_crystal_description       Prism
_exptl_crystal_F_000             612
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.458
_refine_diff_density_min         -0.607
_refine_diff_density_rms         0.098
_refine_ls_extinction_coef       0.0263(17)
_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   1.125
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     78
_refine_ls_number_reflns         1352
_refine_ls_number_restraints     31
_refine_ls_restrained_S_all      1.180
_refine_ls_R_factor_all          0.0329
_refine_ls_R_factor_gt           0.0315
_refine_ls_shift/su_max          0.023
_refine_ls_shift/su_mean         0.003
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0302P)^2^+1.3890P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0761
_refine_ls_wR_factor_ref         0.0769
_reflns_number_gt                1300
_reflns_number_total             1352
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja3047427_si_002.cif
_cod_data_source_block           1
_cod_original_sg_symbol_Hall     'P 2c -2n'
_cod_database_code               4118200