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_7242394
_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            'I6 O18 Sn Sr'
_chemical_formula_weight         1255.71
_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'
_audit_creation_method           SHELXL-2016/6
_audit_update_record
;
2020-11-03 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                   10.807(7)
_cell_length_b                   10.807(7)
_cell_length_c                   11.098(7)
_cell_measurement_reflns_used    1274
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.42
_cell_measurement_theta_min      2.85
_cell_volume                     1122.5(12)
_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 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.0354
_diffrn_reflns_av_unetI/netI     0.0290
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            2340
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.422
_diffrn_reflns_theta_min         2.847
_exptl_absorpt_coefficient_mu    17.713
_exptl_absorpt_correction_T_max  0.7455
_exptl_absorpt_correction_T_min  0.3933
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   face-index
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    5.573
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1650
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.870
_refine_diff_density_min         -0.707
_refine_diff_density_rms         0.211
_refine_ls_extinction_coef       0.00128(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   1.095
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     42
_refine_ls_number_reflns         576
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.095
_refine_ls_R_factor_all          0.0196
_refine_ls_R_factor_gt           0.0172
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+6.0772P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0366
_refine_ls_wR_factor_ref         0.0374
_reflns_Friedel_coverage         0.000
_reflns_number_gt                543
_reflns_number_total             576
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0ra10726c2.cif
_cod_data_source_block           1111
_cod_original_cell_volume        1122.5(16)
_cod_database_code               7242394
_shelx_shelxl_version_number     2016/6
_shelx_res_checksum              5640