The first crystallographic example of a face-sharing fluoroaluminate anion Al(2)F(9)(3-).
Xu, Fei; Matsumoto, Kazuhiko; Hagiwara, Rika; Dalton transactions (Cambridge, England : 2003) 42 (2013) 1965–1968; doi:10.1039/c2dt32624h

data_7020956
_publ_section_title
;
 The first crystallographic example of a face-sharing fluoroaluminate
 anion Al(2)F(9)(3-).
;
_journal_issue                   6
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              1965
_journal_page_last               1968
_journal_paper_doi               10.1039/c2dt32624h
_journal_volume                  42
_journal_year                    2013
_chemical_formula_moiety
;
3(C22 H43 N2), (Al2 F9), 1.754(C H2 Cl2)
;
_chemical_formula_sum            'C67.75 H132.51 Al2 Cl3.51 F9 N6'
_chemical_formula_weight         1380.67
_chemical_name_common            (C18MIm)3(Al2F9)(CH2Cl2)1.754
_chemical_name_systematic
;
?
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                96.083(2)
_cell_angle_beta                 99.426(2)
_cell_angle_gamma                90.012(2)
_cell_formula_units_Z            2
_cell_length_a                   8.8125(6)
_cell_length_b                   14.8052(10)
_cell_length_c                   30.847(2)
_cell_measurement_reflns_used    18638
_cell_measurement_temperature    173
_cell_measurement_theta_max      55.09
_cell_measurement_theta_min      6.15
_cell_volume                     3947.3(5)
_computing_cell_refinement       'RAPID AUTO 2.40 (Rigaku 2006)'
_computing_data_collection       'Rigaku R-AXIS Rapid-II'
_computing_data_reduction        'RAPID AUTO 2.40 (Rigaku 2006)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR92 (Altmare et al., 1994)'
_diffrn_ambient_temperature      173
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Rigaku R-AXIS RapidII'
_diffrn_measurement_method       'imaging plate'
_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  0.0627
_diffrn_reflns_av_sigmaI/netI    0.0874
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       35
_diffrn_reflns_limit_l_min       -35
_diffrn_reflns_number            28593
_diffrn_reflns_theta_full        24.25
_diffrn_reflns_theta_max         24.25
_diffrn_reflns_theta_min         3.07
_exptl_absorpt_coefficient_mu    0.217
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.3783
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'RAPID AUTO 2.40 (Rigaku 2006)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.162
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       platelet
_exptl_crystal_F_000             1495
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.736
_refine_diff_density_min         -0.347
_refine_diff_density_rms         0.059
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     810
_refine_ls_number_reflns         12675
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.1360
_refine_ls_R_factor_gt           0.0702
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0974P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1752
_refine_ls_wR_factor_ref         0.2097
_reflns_number_gt                6652
_reflns_number_total             12675
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2dt32624h.txt
_cod_data_source_block           '[C18MIm]3[Al2F9](CH2Cl2)1.754'
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7020956