Na~3~Co~2~(AsO~4~)(As~2~O~7~): a new sodium cobalt arsenate
Guesmi, Abderrahmen; Driss, Ahmed; Acta Crystallographica Section E 68 (2012) i58–; doi:10.1107/S1600536812027791

data_2235527
_publ_section_title
;
 Na~3~Co~2~(AsO~4~)(As~2~O~7~): a new sodium cobalt arsenate
;
_journal_coeditor_code           JJ2142
_journal_issue                   7
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              i58
_journal_paper_doi               10.1107/S1600536812027791
_journal_volume                  68
_journal_year                    2012
_chemical_formula_iupac          'Na3 Co2 (As O4) (As2 O7)'
_chemical_formula_moiety         'As3 Co2 Na3 O11'
_chemical_formula_sum            'As3 Co2 Na3 O11'
_chemical_formula_weight         587.59
_chemical_name_systematic
;
trisodium dicobalt arsenate diarsenate
;
_space_group_IT_number           12
_symmetry_cell_setting           monoclinic
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'WinGX (Farrugia, 1999) and publCIF (Westrip, 2010)'
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_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
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_diffrn_measured_fraction_theta_max 0.987
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_diffrn_reflns_theta_min         2.50
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_exptl_absorpt_correction_T_max  0.3377
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_exptl_absorpt_process_details
;
(North <i>et al.</i>, 1968)
;
_exptl_crystal_colour            pink
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_exptl_crystal_density_method    'not measured'
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_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 2008)'
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_refine_ls_matrix_type           full
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_refine_ls_R_factor_all          0.0380
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_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
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'calc w=1/[\s^2^(Fo^2^)+(0.0261P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0627
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_reflns_number_gt                998
_reflns_number_total             1183
_reflns_threshold_expression     I>2sigma(I)
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_cod_original_cell_volume        963.2(3)
_cod_original_sg_symbol_H-M      'C 2/m'
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_cod_database_fobs_code          2235527