Accurate X-ray diffraction data required for proper evaluation of bond valence sums and global instability indexes: redetermination of the crystal structures of diamond-like Cu<sub>2</sub>CdSiS<sub>4</sub> and Cu<sub>2</sub>HgSnS<sub>4</sub> as a case study.
Treece, Megan M.; Kelly, Jordan C.; Rosello, Kate E.; Craig, Andrew J.; Aitken, Jennifer A.; Acta crystallographica. Section C, Structural chemistry 79 (2023) –; doi:10.1107/S2053229623006848

data_2312276
_publ_section_title
;
 Accurate X-ray diffraction data required for proper evaluation of bond
 valence sums and global instability indexes: redetermination of the
 crystal structures of diamond-like Cu<sub>2</sub>CdSiS<sub>4</sub> and
 Cu<sub>2</sub>HgSnS<sub>4</sub> as a case study.
;
_journal_coeditor_code           VX3001
_journal_issue                   9
_journal_name_full
'Acta crystallographica. Section C, Structural chemistry'
_journal_paper_doi               10.1107/S2053229623006848
_journal_volume                  79
_journal_year                    2023
_chemical_formula_iupac          'Cu2 Hg Sn S4'
_chemical_formula_moiety         'Cu2 Hg S4 Sn'
_chemical_formula_sum            'Cu2 Hg S4 Sn'
_chemical_formula_weight         574.60
_chemical_name_common            'Copper mercury tin sulfide'
_chemical_name_systematic        'Copper mercury tin sulfide'
_space_group_crystal_system      tetragonal
_space_group_IT_number           121
_space_group_name_Hall           'I -4 2'
_space_group_name_H-M_alt        'I -4 2 m'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2018/3
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   5.5798(12)
_cell_length_b                   5.5798(12)
_cell_length_c                   10.860(3)
_cell_measurement_reflns_used    1625
_cell_measurement_temperature    296
_cell_measurement_theta_max      27.2661
_cell_measurement_theta_min      3.7525
_cell_volume                     338.12(14)
_computing_cell_refinement
;
SAINT (Bruker, 2018)
;
_computing_data_collection
;
SMART (Bruker, 2001)
;
_computing_data_reduction
;
SAINT (Bruker, 2018)
;
_computing_molecular_graphics
;
ShelXle (H\"ubschle <i>et al.</i>,  2011)
;
_computing_publication_material
;
SHELXL2018 (Sheldrick, 2015<i>b</i>)
;
_computing_structure_refinement
;
SHELXL2018 (Sheldrick, 2015<i>b</i>)
;
_computing_structure_solution
;
SHELXL2014 (Sheldrick, 2015<i>a</i>)
;
_diffrn_ambient_temperature      296
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker SMART APEXII CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0403
_diffrn_reflns_av_unetI/netI     0.0230
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            2088
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.266
_diffrn_reflns_theta_min         3.752
_diffrn_source                   'fine focus sealed tube X-ray source'
_exptl_absorpt_coefficient_mu    33.598
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.3518
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(SADABS; Sheldrick, 2002)
;
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    5.644
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             504
_exptl_crystal_size_max          0.136
_exptl_crystal_size_mid          0.134
_exptl_crystal_size_min          0.076
_refine_diff_density_max         0.534
_refine_diff_density_min         -0.855
_refine_ls_abs_structure_details
;
Flack <i>x</i> determined using 76 quotients [(I+)-(I-)]/[(I+)+(I-)]
(Parsons <i>et al.</i>,  2013)
;
_refine_ls_abs_structure_Flack   0.021(11)
_refine_ls_extinction_coef       0.0232(10)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method
;
SHELXL2018 (Sheldrick, 2015<i>b</i>)
;
_refine_ls_goodness_of_fit_ref   1.080
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     14
_refine_ls_number_reflns         218
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.080
_refine_ls_R_factor_all          0.0141
_refine_ls_R_factor_gt           0.0141
_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^)+(0.0124P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0317
_refine_ls_wR_factor_ref         0.0317
_reflns_number_gt                218
_reflns_number_total             218
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            vx3001sup1.cif
_cod_data_source_block           Cu2HgSnS4
_cod_original_cell_volume        338.11(17)
_cod_database_code               2312276
_shelx_estimated_absorpt_t_min   0.092
_shelx_estimated_absorpt_t_max   0.184
_shelx_hkl_checksum              6352
_shelx_res_checksum              95076
_cod_database_fobs_code 2312276