Hydrogen-bonded organo-amino phosphonium halides: dielectric, piezoelectric and possible ferroelectric properties.
Vijayakanth, Thangavel; Pandey, Richa; Kulkarni, Priyangi; Praveenkumar, Balu; Kabra, Dinesh; Boomishankar, Ramamoorthy; Dalton transactions (Cambridge, England : 2003) 48 (2019) 7331–7336; doi:10.1039/c8dt04498h

data_7049127
_publ_section_title
;
 Hydrogen-bonded organo-amino phosphonium halides: dielectric,
 piezoelectric and possible ferroelectric properties.
;
_journal_issue                   21
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              7331
_journal_page_last               7336
_journal_paper_doi               10.1039/c8dt04498h
_journal_volume                  48
_journal_year                    2019
_chemical_formula_sum            'C18 H26 I N2 P'
_chemical_formula_weight         428.28
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2019-01-21 deposited with the CCDC.    2019-02-21 downloaded from the CCDC.
;
_cell_angle_alpha                90
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_cell_angle_gamma                90
_cell_formula_units_Z            4
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_cell_length_b                   15.345(2)
_cell_length_c                   13.770(2)
_cell_measurement_reflns_used    7992
_cell_measurement_temperature    373(2)
_cell_measurement_theta_max      21.53
_cell_measurement_theta_min      2.49
_cell_volume                     2037.0(5)
_computing_cell_refinement       'Bruker SAINT'
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_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       'Omega and phi scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0701
_diffrn_reflns_av_unetI/netI     0.0658
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 1.000
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_diffrn_reflns_limit_h_min       -12
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_diffrn_reflns_limit_k_min       -15
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_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            36632
_diffrn_reflns_point_group_measured_fraction_full 0.902
_diffrn_reflns_point_group_measured_fraction_max 0.886
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.483
_diffrn_reflns_theta_min         2.113
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    1.650
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6818
_exptl_absorpt_correction_type   multi-scan
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_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.396
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
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_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.11
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_refine_diff_density_max         0.525
_refine_diff_density_min         -0.638
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_refine_ls_abs_structure_details
;
 Flack x determined using 1760 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.003(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.020
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     357
_refine_ls_number_reflns         8293
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0756
_refine_ls_R_factor_gt           0.0432
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0405P)^2^+0.2903P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0919
_refine_ls_wR_factor_ref         0.1063
_reflns_Friedel_coverage         0.708
_reflns_Friedel_fraction_full    0.796
_reflns_Friedel_fraction_max     0.763
_reflns_number_gt                5591
_reflns_number_total             8293
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8dt04498h2.cif
_cod_data_source_block           TRI_a_CCDC3
_cod_depositor_comments
'Adding full bibliography for 7049122--7049129.cif.'
_cod_original_cell_volume        2037.1(5)
_cod_database_code               7049127
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              73726