A novel triply chromium(III)-substituted keggin anion, [<i>A</i>-α-SiO~4~W~9~Cr~3~(OH~2~)~3~O~33~]^7{‒^}
Wassermann, K.; Lunk, H.-J.; Palm, R.; Fuchs, J.; Acta Crystallographica Section C 50 (1994) 348–350; doi:10.1107/S0108270193008601

data_2009557
_publ_section_title
;
 A novel triply chromium(III)-substituted keggin anion,
 [<i>A</i>-\a-SiO~4~W~9~Cr~3~(OH~2~)~3~O~33~]^7{--^}
;
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              348
_journal_page_last               350
_journal_paper_doi               10.1107/S0108270193008601
_journal_volume                  50
_journal_year                    1994
_chemical_formula_sum            'Cr3 H32 K3 O51 Si'
_chemical_formula_weight         2804.25
_space_group_IT_number           62
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2n'
_symmetry_space_group_name_H-M   'P n m a'
_atom_type_scat_source           IntTabIV
_cell_angle_alpha                90.0
_cell_angle_beta                 90.0
_cell_angle_gamma                90.0
_cell_formula_units_Z            4
_cell_length_a                   25.365(3)
_cell_length_b                   14.985(2)
_cell_length_c                   12.315(2)
_cell_measurement_reflns_used    88
_cell_measurement_temperature    292
_cell_measurement_theta_max      12.5
_cell_measurement_theta_min      5
_cell_volume                     4680.9(11)
_diffrn_measurement_device       Stoe-4
_diffrn_measurement_method       \w
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.143
_diffrn_reflns_limit_h_max       0
_diffrn_reflns_limit_h_min       -32
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            5278
_diffrn_reflns_theta_max         27
_diffrn_standards_decay_%        3
_diffrn_standards_interval_time  90
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    244.31
_exptl_absorpt_correction_T_max  1.278
_exptl_absorpt_correction_T_min  0.853
_exptl_absorpt_correction_type   'empirical (DIFABS; Walker & Stuart, 1983)'
_exptl_crystal_colour            Green
_exptl_crystal_density_diffrn    3.909
_exptl_crystal_description       Needles
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.15
_refine_diff_density_max         -6.7
_refine_diff_density_min         7.2
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_obs   1.019
_refine_ls_hydrogen_treatment    noref
_refine_ls_number_parameters     193
_refine_ls_number_reflns         3335
_refine_ls_R_factor_obs          0.063
_refine_ls_shift/esd_max         0.03
_refine_ls_structure_factor_coef F
_refine_ls_weighting_scheme      unit
_refine_ls_wR_factor_obs         0.063
_reflns_number_observed          3335
_reflns_number_total             4759
_reflns_observed_criterion       I>2\s(I)
_cod_data_source_file            se1029.cif
_cod_data_source_block           se1029_structure_1_of_1
_cod_original_cell_volume        4680.9(9)
_cod_original_formula_sum        'H32 Cr3 K3 O51 Si'
_cod_database_code               2009557