Coexistence of normal and inverse deuterium isotope effects in a phase-transition sequence of organic ferroelectrics
Horiuchi, Sachio; Ishibashi, Shoji; Kobayashi, Kensuke; Kumai, Reiji; RSC Advances 9 (2019) 39662–; doi:10.1039/C9RA06489C

data_7239609
_publ_section_title
;
 Coexistence of normal and inverse deuterium isotope effects in a
 phase-transition sequence of organic ferroelectrics
;
_journal_issue                   68
_journal_name_full               'RSC Advances'
_journal_page_first              39662
_journal_paper_doi               10.1039/C9RA06489C
_journal_volume                  9
_journal_year                    2019
_chemical_formula_moiety         'C16 H10 I2 N2 O4'
_chemical_formula_sum            'C16 H10 I2 N2 O4'
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_space_group_name_Hall           '-P 1'
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_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_update_record
;
2019-11-12 deposited with the CCDC.	2019-11-22 downloaded from the CCDC.
;
_cell_angle_alpha                102.855(2)
_cell_angle_beta                 100.7131(18)
_cell_angle_gamma                107.846(3)
_cell_formula_units_Z            2
_cell_length_a                   8.4936(15)
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_cell_measurement_temperature    295
_cell_measurement_theta_max      27.50
_cell_measurement_theta_min      3.40
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_computing_cell_refinement       'CrystalClear-SM Expert 2.1 b29'
_computing_data_collection       'CrystalClear-SM Expert 2.1 b29 (Rigaku, 2013)'
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_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Rigaku XtaLAB P200'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Mo K\a'
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_diffrn_reflns_limit_k_min       -12
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_diffrn_reflns_limit_l_min       -14
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_diffrn_reflns_point_group_measured_fraction_full 0.992
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_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.522
_diffrn_reflns_theta_min         3.386
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    3.837
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_exptl_absorpt_correction_type   numerical
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_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    2.206
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       platelet
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_exptl_crystal_size_max          0.400
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_refine_diff_density_max         0.98
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_refine_ls_extinction_coef       0.0751(15)
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_hydrogen_treatment    mixed
_refine_ls_number_parameters     226
_refine_ls_number_reflns         3761
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_refine_ls_R_factor_all          0.0329
_refine_ls_R_factor_gt           0.0303
_refine_ls_shift/su_max          0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0304P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0664
_refine_ls_wR_factor_ref         0.0692
_reflns_Friedel_coverage         0.000
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_reflns_threshold_expression     F^2^>2.0\s(F^2^)
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