Oxidation State of Uranium in A6Cu12U2S15 (A = K, Rb, Cs) Compounds
Christos D. Malliakas; Jiyong Yao; Daniel M. Wells; Geng Bang Jin; S. Skanthakumar; Eun Sang Choi; Mahalingam Balasubramanian; L. Soderholm; Donald E. Ellis; Mercouri G. Kanatzidis; James A. Ibers; Inorganic Chemistry 51 (2012) 6153–6163; doi:10.1021/ic300172k

data_4329333
_publ_section_title
;
 Oxidation State of Uranium in A6Cu12U2S15 (A = K, Rb, Cs) Compounds
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              6153
_journal_page_last               6163
_journal_paper_doi               10.1021/ic300172k
_journal_volume                  51
_journal_year                    2012
_chemical_formula_sum            'Cu12 K6 S15 U2'
_chemical_formula_weight         1954.04
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           230
_symmetry_cell_setting           cubic
_symmetry_space_group_name_Hall  '-I 4bd 2c 3'
_symmetry_space_group_name_H-M   'I a -3 d'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   18.6208(7)
_cell_length_b                   18.6208(7)
_cell_length_c                   18.6208(7)
_cell_measurement_reflns_used    34215
_cell_measurement_temperature    300.0(3)
_cell_volume                     6456.5(4)
_diffrn_ambient_temperature      300.0(3)
_diffrn_detector                 'image plate (34 cm diameter)'
_diffrn_detector_area_resol_mean 6.67
_diffrn_detector_type            STOE
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_details      ' 180 frames, detector distance = 60 mm'
_diffrn_measurement_device       '2-circle goniometer'
_diffrn_measurement_device_type  'STOE IPDS 2'
_diffrn_measurement_method       'rotation method'
_diffrn_radiation_collimation    '0.5 mm diameter, monocapillary'
_diffrn_radiation_monochromator  'plane graphite'
_diffrn_radiation_polarisn_norm  0
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0624
_diffrn_reflns_av_sigmaI/netI    0.0134
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            19283
_diffrn_reflns_theta_full        27.46
_diffrn_reflns_theta_max         27.46
_diffrn_reflns_theta_min         3.09
_diffrn_source
'sealed X-ray tube, 12 x 0.4 mm long-fine focus'
_diffrn_source_current           40
_diffrn_source_power             2.00
_diffrn_source_voltage           50
_exptl_absorpt_coefficient_mu    19.458
_exptl_absorpt_correction_T_max  0.1389
_exptl_absorpt_correction_T_min  0.0607
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   X-Shape2
_exptl_crystal_density_diffrn    4.020
_exptl_crystal_F_000             7088
_exptl_crystal_size_max          0.21
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.741
_refine_diff_density_min         -1.096
_refine_diff_density_rms         0.203
_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   1.248
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     30
_refine_ls_number_reflns         622
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.248
_refine_ls_R_factor_all          0.0481
_refine_ls_R_factor_gt           0.0481
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0496P)^2^+383.4168P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1362
_refine_ls_wR_factor_ref         0.1363
_reflns_number_gt                620
_reflns_number_total             622
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic300172k_si_003_3.cif
_cod_data_source_block           K6Cu12U2S15_300K
_cod_database_code               4329333