Hexagonal-Diamond-like Gold Lattices, Ba and (Au,T)3 Interstitials, and Delocalized Bonding in a Family of Intermetallic Phases Ba2Au6(Au,T)3 (T = Zn, Cd, Ga, In, or Sn)
Qisheng Lin; Trinath Mishra; John D. Corbett; Journal of the American Chemical Society 135 (2013) 11023–11031; doi:10.1021/ja401378q

data_4120177
_publ_section_title
;
 Hexagonal-Diamond-like Gold Lattices, Ba and (Au,T)3 Interstitials, and
 Delocalized Bonding in a Family of Intermetallic Phases Ba2Au6(Au,T)3 (T
 = Zn, Cd, Ga, In, or Sn)
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              11023
_journal_page_last               11031
_journal_paper_doi               10.1021/ja401378q
_journal_volume                  135
_journal_year                    2013
_chemical_formula_sum            'Au6.81 Ba2 Ga2.19'
_chemical_formula_weight         1768.71
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           167
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  '-R 3 2"c'
_symmetry_space_group_name_H-M   'R -3 c :H'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                120.00
_cell_formula_units_Z            6
_cell_length_a                   8.7186(8)
_cell_length_b                   8.7186(8)
_cell_length_c                   21.816(2)
_cell_measurement_temperature    293(2)
_cell_volume                     1436.1(2)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.962
_diffrn_measured_fraction_theta_max 0.962
_diffrn_measurement_device_type  'Smart Apex CCD'
_diffrn_measurement_method       w/
_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  0.0728
_diffrn_reflns_av_sigmaI/netI    0.0375
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            3296
_diffrn_reflns_theta_full        28.23
_diffrn_reflns_theta_max         28.23
_diffrn_reflns_theta_min         3.28
_exptl_absorpt_coefficient_mu    117.948
_exptl_absorpt_correction_T_max  0.433
_exptl_absorpt_correction_T_min  0.052
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            grey
_exptl_crystal_density_diffrn    12.270
_exptl_crystal_description       irregular
_exptl_crystal_F_000             4307
_exptl_crystal_size_max          0.06
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.02
_refine_diff_density_max         2.169
_refine_diff_density_min         -1.545
_refine_diff_density_rms         0.482
_refine_ls_extinction_coef       0.000043(8)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.941
_refine_ls_matrix_type           full
_refine_ls_number_parameters     20
_refine_ls_number_reflns         385
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.941
_refine_ls_R_factor_all          0.0299
_refine_ls_R_factor_gt           0.0225
_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^)+(0.0201P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0443
_refine_ls_wR_factor_ref         0.0455
_reflns_number_gt                319
_reflns_number_total             385
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja401378q_si_001_7.cif
_cod_data_source_block           crystal_4s
_cod_original_sg_symbol_H-M      'R -3 c'
_cod_database_code               4120177