SrTi(IO3)6·2H2O and SrSn(IO3)6: distinct arrangements of lone pair electrons leading to large birefringences
Liu, Kaitong; Han, Jian; Huang, Junben; Wei, Zhonglei; Yang, Zhihua; Pan, Shilie; RSC Advances 11 (2021) 10309–10315; doi:10.1039/D0RA10726C

data_7242392
_publ_section_title
;
 SrTi(IO3)6&#x00B7;2H2O and SrSn(IO3)6: distinct arrangements of lone pair
 electrons leading to large birefringences
;
_journal_issue                   17
_journal_name_full               'RSC Advances'
_journal_page_first              10309
_journal_page_last               10315
_journal_paper_doi               10.1039/D0RA10726C
_journal_volume                  11
_journal_year                    2021
_chemical_formula_sum            'H4 I6 O20 Sr Ti'
_chemical_formula_weight         1220.95
_space_group_crystal_system      trigonal
_space_group_IT_number           148
_space_group_name_Hall           '-R 3'
_space_group_name_H-M_alt        'R -3 :H'
_atom_sites_solution_hydrogens   difmap
_audit_creation_method           SHELXL-2016/6
_audit_update_record
;
2020-11-25 deposited with the CCDC.	2021-03-03 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            3
_cell_length_a                   11.3720(11)
_cell_length_b                   11.3720(11)
_cell_length_c                   12.5321(19)
_cell_measurement_reflns_used    1463
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.30
_cell_measurement_theta_min      2.63
_cell_volume                     1403.6(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2016/6 (Sheldrick, 2016)'
_computing_structure_solution    'SHELXS-97 (Sheldrick 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0390
_diffrn_reflns_av_unetI/netI     0.0306
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            2867
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.318
_diffrn_reflns_theta_min         2.630
_exptl_absorpt_coefficient_mu    13.272
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6382
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   face-index
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    4.334
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1626
_exptl_crystal_size_max          0.19
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.808
_refine_diff_density_min         -0.596
_refine_diff_density_rms         0.161
_refine_ls_extinction_coef       0.00224(7)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2016/6 (Sheldrick 2016)'
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     46
_refine_ls_number_reflns         704
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.082
_refine_ls_R_factor_all          0.0221
_refine_ls_R_factor_gt           0.0191
_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^)+(0.0123P)^2^+2.9095P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0380
_refine_ls_wR_factor_ref         0.0390
_reflns_Friedel_coverage         0.000
_reflns_number_gt                647
_reflns_number_total             704
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0ra10726c2.cif
_cod_data_source_block           11
_cod_database_code               7242392
_shelx_shelxl_version_number     2016/6
_shelx_res_checksum              92905