A new iodate-phosphate Pb<sub>2</sub>(IO<sub>3</sub>)(PO<sub>4</sub>) achieving great improvement in birefringence activated by (IO<sub>3</sub>)<sup>-</sup> groups.
Zhang, Xiao-Han; Yang, Bing-Ping; Chen, Jin; Hu, Chun-Li; Fang, Zhi; Wang, Zujian; Mao, Jiang-Gao; Chemical communications (Cambridge, England) 56 (2020) 635–638; doi:10.1039/c9cc08739g

data_7125651
_publ_section_title
;
 A new iodate-phosphate Pb<sub>2</sub>(IO<sub>3</sub>)(PO<sub>4</sub>)
 achieving great improvement in birefringence activated by
 (IO<sub>3</sub>)<sup>-</sup> groups.
;
_journal_issue                   4
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              635
_journal_page_last               638
_journal_paper_doi               10.1039/c9cc08739g
_journal_volume                  56
_journal_year                    2020
_chemical_formula_sum            'I O7 P Pb2'
_chemical_formula_weight         684.25
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2019-10-28 deposited with the CCDC.	2019-12-04 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 104.973(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.3740(3)
_cell_length_b                   6.8144(3)
_cell_length_c                   13.6077(5)
_cell_measurement_reflns_used    3169
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      29.0190
_cell_measurement_theta_min      3.5730
_cell_volume                     660.56(5)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  ccd
_diffrn_measurement_method       ccd
_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  0.0990
_diffrn_reflns_av_sigmaI/netI    0.0678
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            6133
_diffrn_reflns_theta_full        27.10
_diffrn_reflns_theta_max         27.10
_diffrn_reflns_theta_min         3.59
_exptl_absorpt_coefficient_mu    55.812
_exptl_absorpt_correction_T_max  2.733
_exptl_absorpt_correction_T_min  0.245
_exptl_absorpt_correction_type   gaussian
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    6.880
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       bulk
_exptl_crystal_F_000             1152
_exptl_crystal_size_max          0.05
_exptl_crystal_size_mid          0.03
_exptl_crystal_size_min          0.02
_refine_diff_density_max         3.789
_refine_diff_density_min         -3.791
_refine_diff_density_rms         0.705
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.027
_refine_ls_matrix_type           full
_refine_ls_number_parameters     100
_refine_ls_number_reflns         1438
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0557
_refine_ls_R_factor_gt           0.0491
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0609P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1146
_refine_ls_wR_factor_ref         0.1213
_reflns_number_gt                1225
_reflns_number_total             1438
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c9cc08739g2.cif
_cod_data_source_block           m2
_cod_depositor_comments          'Adding full bibliography for 7125651.cif.'
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               7125651