A severely interrupted germanate zeolite framework synthesised from isolated double four-ring units.
Villaescusa, Luis A.; Wheatley, Paul S.; Morris, Russell E.; Lightfoot, Philip; Dalton transactions (Cambridge, England : 2003)  (2004) 820–824; doi:10.1039/b314942k

data_7013811
_publ_section_title
;
 A severely interrupted germanate zeolite framework synthesised from
 isolated double four-ring units.
;
_journal_issue                   5
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              820
_journal_page_last               824
_journal_paper_doi               10.1039/b314942k
_journal_year                    2004
_chemical_formula_sum            'F3 Ge25.5 O53'
_chemical_formula_weight         2756.0
_chemical_name_systematic
;
?
;
_space_group_IT_number           63
_symmetry_cell_setting           Cmcm
_symmetry_space_group_name_Hall  '-C 2c 2'
_symmetry_space_group_name_H-M   'C m c m'
_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                90.00
_cell_formula_units_Z            4
_cell_length_a                   33.081(2)
_cell_length_b                   18.5854(13)
_cell_length_c                   13.9571(10)
_cell_measurement_temperature    293(2)
_cell_volume                     8581.2(10)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.923
_diffrn_measured_fraction_theta_max 0.923
_diffrn_radiation_monochromator  silicon
_diffrn_radiation_source         synchrotron
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.6899
_diffrn_reflns_av_R_equivalents  0.0564
_diffrn_reflns_av_sigmaI/netI    0.0459
_diffrn_reflns_limit_h_max       47
_diffrn_reflns_limit_h_min       -39
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            25017
_diffrn_reflns_theta_full        30.40
_diffrn_reflns_theta_max         30.40
_diffrn_reflns_theta_min         1.93
_exptl_absorpt_coefficient_mu    9.043
_exptl_crystal_density_diffrn    2.134
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             5068
_refine_diff_density_max         7.418
_refine_diff_density_min         -4.675
_refine_diff_density_rms         0.542
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.303
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     205
_refine_ls_number_reflns         6308
_refine_ls_number_restraints     10
_refine_ls_restrained_S_all      1.302
_refine_ls_R_factor_all          0.1120
_refine_ls_R_factor_gt           0.1031
_refine_ls_shift/su_max          0.049
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1036P)^2^+447.2657P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2693
_refine_ls_wR_factor_ref         0.2744
_reflns_number_gt                5577
_reflns_number_total             6308
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b314942k.txt
_cod_data_source_block           STAG-1
_cod_original_cell_volume        8581.3(11)
_cod_database_code               7013811