Open-Framework and Microporous Vanadium Silicates
Xiqu Wang; Lumei Liu; Allan J. Jacobson; Journal of the American Chemical Society 124 (2002) 7812–7820; doi:10.1021/ja020354l

data_4114913
_publ_contact_author_address
;
Department of Chemistry    
University of Houston,
Houston, TX 77204-5003
;
_publ_contact_author_email       ' ajjcob@uh.edu '
_publ_contact_author_fax         ' 713 743 2787 '
_publ_contact_author_name
;
Prof. Allan J. Jacobson
;
_publ_contact_author_phone       ' 713 743 2785 '
_publ_section_title
;
 Open-Framework and Microporous Vanadium Silicates
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7812
_journal_page_last               7820
_journal_paper_doi               10.1021/ja020354l
_journal_volume                  124
_journal_year                    2002
_chemical_formula_sum            'H6 O14 Rb2 Si4 V'
_chemical_formula_weight         564.29
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           166
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  '-R 3 2"'
_symmetry_space_group_name_H-M   'R -3 m :H'
_atom_sites_solution_hydrogens   geom
_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            9
_cell_length_a                   13.2878(8)
_cell_length_b                   13.2878(8)
_cell_length_c                   21.256(2)
_cell_measurement_temperature    293(2)
_cell_volume                     3250.3(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.943
_diffrn_measured_fraction_theta_max 0.943
_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  0.0655
_diffrn_reflns_av_sigmaI/netI    0.0508
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            6804
_diffrn_reflns_theta_full        28.51
_diffrn_reflns_theta_max         28.51
_diffrn_reflns_theta_min         2.01
_exptl_absorpt_coefficient_mu    7.781
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.6883
_exptl_absorpt_correction_type   'multi-scan (SADABS)'
_exptl_crystal_colour            BLUE-GREEN
_exptl_crystal_density_diffrn    2.595
_exptl_crystal_description       PRISM
_exptl_crystal_F_000             2439
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.06
_refine_diff_density_max         1.316
_refine_diff_density_min         -1.223
_refine_diff_density_rms         0.273
_refine_ls_extinction_coef       0.0021(5)
_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   1.113
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     94
_refine_ls_number_reflns         978
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.113
_refine_ls_R_factor_all          0.1475
_refine_ls_R_factor_gt           0.1109
_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^)+(0.1506P)^2^+314.7467P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.3551
_refine_ls_wR_factor_ref         0.3725
_reflns_number_gt                643
_reflns_number_total             978
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja020354l_04.cif
_cod_data_source_block           VSH-4Rb
_cod_original_sg_symbol_H-M      'R -3 m'
_cod_database_code               4114913