A N-Heterocyclic Carbene-Stabilized Coinage Metal-Chalcogenide Framework with Tunable Optical Properties.
Polgar, Alexander M.; Weigend, Florian; Zhang, Angel; Stillman, Martin J.; Corrigan, John F.; Journal of the American Chemical Society 139 (2017) 14045–14048; doi:10.1021/jacs.7b09025

data_4131701
_publ_section_title
;
 A N-Heterocyclic Carbene-Stabilized Coinage Metal-Chalcogenide Framework
 with Tunable Optical Properties.
;
_journal_issue                   40
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              14045
_journal_page_last               14048
_journal_paper_doi               10.1021/jacs.7b09025
_journal_volume                  139
_journal_year                    2017
_chemical_formula_sum            'C108 H144 Ag4 Au4 N8 Se4'
_chemical_formula_weight         3089.49
_space_group_crystal_system      tetragonal
_space_group_IT_number           82
_space_group_name_Hall           'I -4'
_space_group_name_H-M_alt        'I -4'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   18.437(4)
_cell_length_b                   18.437(4)
_cell_length_c                   16.477(6)
_cell_measurement_reflns_used    9587
_cell_measurement_temperature    110
_cell_measurement_theta_max      33.21
_cell_measurement_theta_min      2.21
_cell_volume                     5601(3)
_computing_cell_refinement       SAINT
_computing_data_collection       Apex2
_computing_data_reduction        SAINT
_computing_molecular_graphics    NRCVAX
_computing_publication_material  cif2tables.py
_computing_structure_refinement  SHELXL-2014
_computing_structure_solution    SHELXT
_diffrn_ambient_temperature      110
_diffrn_detector                 'CCD plate'
_diffrn_detector_type            'Bruker Apex2'
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device       '\k-geometry diffractometer'
_diffrn_measurement_device_type  'Bruker Kappa Axis Apex2'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0485
_diffrn_reflns_av_unetI/netI     0.0452
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       32
_diffrn_reflns_limit_h_min       -31
_diffrn_reflns_limit_k_max       32
_diffrn_reflns_limit_k_min       -32
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            201468
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         38.596
_diffrn_reflns_theta_min         2.762
_diffrn_source                   'sealed tube'
_exptl_absorpt_coefficient_mu    7.247
_exptl_absorpt_correction_T_max  0.7476
_exptl_absorpt_correction_T_min  0.6462
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.832
_exptl_crystal_description       prism
_exptl_crystal_F_000             2976
_exptl_crystal_size_max          0.154
_exptl_crystal_size_mid          0.140
_exptl_crystal_size_min          0.107
_refine_diff_density_max         1.186
_refine_diff_density_min         -1.208
_refine_diff_density_rms         0.107
_refine_ls_abs_structure_details
;
 Flack x determined using 5795 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.0271(14)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.974
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     298
_refine_ls_number_reflns         15805
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.974
_refine_ls_R_factor_all          0.0372
_refine_ls_R_factor_gt           0.0261
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0142P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0394
_refine_ls_wR_factor_ref         0.0412
_reflns_Friedel_coverage         0.946
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.997
_reflns_number_gt                13777
_reflns_number_total             15805
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b09025_si_002.cif
_cod_data_source_block           b17167_2b
_cod_database_code               4131701
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.402
_shelx_estimated_absorpt_t_max   0.511
_shelx_res_checksum              68722
_shelx_hkl_checksum              95234