An Alternative Approach to Al202 Ring Systems by Unexpected Cleavage of Stable Al-F- and Si-O- Bonds
Carsten Rennekamp; Helge Wessel; Herbert W. Roesky; Peter Müller; Hans-Georg Schmidt; Mathias Noltemeyer; Isabel Usón; Andrew R. Barron; Inorganic Chemistry 38 (1999) 5235–5240; doi:10.1021/ic990185e

data_4322375
_publ_section_title
;
 An Alternative Approach to Al202 Ring Systems by Unexpected Cleavage of
 Stable Al-F- and Si-O- Bonds
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              5235
_journal_page_last               5240
_journal_paper_doi               10.1021/ic990185e
_journal_volume                  38
_journal_year                    1999
_chemical_formula_sum            'C76 H114 Al4 F2 O6'
_chemical_formula_weight         1269.59
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 97.13(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   10.050(2)
_cell_length_b                   23.111(5)
_cell_length_c                   16.234(3)
_cell_measurement_reflns_used    8192
_cell_measurement_temperature    133(2)
_cell_measurement_theta_max      26.0
_cell_measurement_theta_min      2.8
_cell_volume                     3741.4(13)
_computing_cell_refinement       'Siemens SAINT (V. 5.00, Siemens 1998)'
_computing_data_collection       'Siemens SMART (V. 4.202, Siemens 1996)'
_computing_data_reduction        'Siemens SAINT (V. 5.00, Siemens 1998)'
_computing_molecular_graphics    'Bruker AXS SHELXTL (V. 5.10)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      133(2)
_diffrn_detector_area_resol_mean '8.192 pixels/mm'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type
'Stoe-Siemens-Huber four circle diffractometer'
_diffrn_measurement_method       'phi and omega scan'
_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  0.0676
_diffrn_reflns_av_sigmaI/netI    0.0415
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       28
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            46293
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         2.17
_exptl_absorpt_coefficient_mu    0.115
_exptl_absorpt_correction_T_max  0.9773
_exptl_absorpt_correction_T_min  0.9662
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.127
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       blocks
_exptl_crystal_F_000             1376
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.457
_refine_diff_density_min         -0.331
_refine_diff_density_rms         0.052
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.144
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     409
_refine_ls_number_reflns         7344
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.144
_refine_ls_R_factor_all          0.0895
_refine_ls_R_factor_gt           0.0642
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0299P)^2^+4.1473P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1227
_refine_ls_wR_factor_ref         0.1327
_reflns_number_gt                5738
_reflns_number_total             7344
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic990185e_1.cif
_cod_data_source_block           compound1
_cod_original_cell_volume        3741.6(13)
_cod_database_code               4322375