Eight-Coordinated Arsenic in the Zintl Phases RbCd4As3 and RbZn4As3: Synthesis and Structural Characterization
Hua He; Chauntae Tyson; Svilen Bobev; Inorganic Chemistry 50 (2011) 8375–8383; doi:10.1021/ic2009418

data_4326071
_publ_section_title
;
 Eight-Coordinated Arsenic in the Zintl Phases RbCd4As3 and RbZn4As3:
 Synthesis and Structural Characterization
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              8375
_journal_page_last               8383
_journal_paper_doi               10.1021/ic2009418
_journal_volume                  50
_journal_year                    2011
_chemical_formula_moiety         'As3 Cd4, Na'
_chemical_formula_sum            'As3 Cd4 Na'
_chemical_formula_weight         697.35
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           166
_symmetry_cell_setting           hexagonal
_symmetry_space_group_name_Hall  '-R 3 2"'
_symmetry_space_group_name_H-M   'R -3 m :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            3
_cell_length_a                   4.4546(7)
_cell_length_b                   4.4546(7)
_cell_length_c                   33.681(8)
_cell_measurement_reflns_used    225
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      28.20
_cell_measurement_theta_min      1.81
_cell_volume                     578.81(19)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      200(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0514
_diffrn_reflns_av_sigmaI/netI    0.0299
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       44
_diffrn_reflns_limit_l_min       -44
_diffrn_reflns_number            2602
_diffrn_reflns_theta_full        28.20
_diffrn_reflns_theta_max         28.20
_diffrn_reflns_theta_min         1.81
_exptl_absorpt_coefficient_mu    23.581
_exptl_absorpt_correction_T_max  0.790
_exptl_absorpt_correction_T_min  0.174
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS (Sheldrick, 2003)
;
_exptl_crystal_colour            gold
_exptl_crystal_density_diffrn    6.002
_exptl_crystal_description       plate
_exptl_crystal_F_000             906
_exptl_crystal_size_max          0.08
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.01
_refine_diff_density_max         2.765
_refine_diff_density_min         -3.161
_refine_diff_density_rms         0.386
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.191
_refine_ls_matrix_type           full
_refine_ls_number_parameters     14
_refine_ls_number_reflns         225
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.191
_refine_ls_R_factor_all          0.0370
_refine_ls_R_factor_gt           0.0355
_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^)+(0.0523P)^2^+21.5745P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1008
_refine_ls_wR_factor_ref         0.1020
_reflns_number_gt                216
_reflns_number_total             225
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic2009418_si_002_NaCd4As3.cif
_cod_data_source_block           NaCd4As3
_cod_original_cell_volume        578.81(18)
_cod_original_sg_symbol_H-M      'R -3 m'
_cod_database_code               4326071