A Stable Neutral Compound with an Aluminum-Aluminum Double Bond.
Bag, Prasenjit; Porzelt, Amelie; Altmann, Philipp J.; Inoue, Shigeyoshi; Journal of the American Chemical Society 139 (2017) 14384–14387; doi:10.1021/jacs.7b08890

data_4131696
_publ_section_title
;
 A Stable Neutral Compound with an Aluminum-Aluminum Double Bond.
;
_journal_issue                   41
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              14384
_journal_page_last               14387
_journal_paper_doi               10.1021/jacs.7b08890
_journal_volume                  139
_journal_year                    2017
_chemical_compound_source        'see text'
_chemical_formula_moiety         'C40 H82 Al2 N4 Si2'
_chemical_formula_sum            'C40 H82 Al2 N4 Si2'
_chemical_formula_weight         729.24
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_cell_setting           triclinic
_symmetry_Int_Tables_number      2
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_cell_angle_alpha                99.203(2)
_cell_angle_beta                 106.019(2)
_cell_angle_gamma                110.967(2)
_cell_formula_units_Z            1
_cell_length_a                   9.5006(5)
_cell_length_b                   11.8557(6)
_cell_length_c                   11.8594(6)
_cell_measurement_reflns_used    9898
_cell_measurement_temperature    100
_cell_measurement_theta_max      25.7006
_cell_measurement_theta_min      2.2597
_cell_volume                     1148.04(11)
_computing_cell_refinement       'SAINT (Bruker, 2014)'
_computing_data_collection       'APEX III Control Software (Bruker, 2015)'
_computing_data_reduction        'SAINT (Bruker, 2014)'
_computing_molecular_graphics    'PLATON (Spek, 2011)'
_computing_publication_material  'PLATON (Spek, 2011), enCIFer (Allen, 2014)'
_computing_structure_refinement
'SHELXL2014 (Sheldrick, 2014), SHELXLE (Huebschle, 2011)'
_computing_structure_solution    'SHELXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      100
_diffrn_detector                 ' CMOS plate '
_diffrn_detector_area_resol_mean 16
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device       ' \k-geometry diffractometer '
_diffrn_measurement_device_type  ' Bruker Photon CMOS '
_diffrn_measurement_method       ' phi- and omega-rotation '
_diffrn_radiation_monochromator  'Helios optic'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_source         'TXS rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0459
_diffrn_reflns_av_unetI/netI     0.0242
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            30467
_diffrn_reflns_reduction_process
;
;
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         2.26
_exptl_absorpt_coefficient_mu    0.145
_exptl_absorpt_correction_T_max  0.7453
_exptl_absorpt_correction_T_min  0.6868
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS 2014/5, Bruker, 2014'
_exptl_crystal_colour            'dark purple'
_exptl_crystal_density_diffrn    1.055
_exptl_crystal_density_method    'Not Measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             404
_exptl_crystal_size_max          0.125
_exptl_crystal_size_mid          0.119
_exptl_crystal_size_min          0.052
_refine_diff_density_max         0.723
_refine_diff_density_min         -0.952
_refine_diff_density_rms         0.067
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     328
_refine_ls_number_reflns         4051
_refine_ls_number_restraints     114
_refine_ls_restrained_S_all      1.172
_refine_ls_R_factor_all          0.0783
_refine_ls_R_factor_gt           0.0676
_refine_ls_shift/su_max          0.041
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'W=1/[\S^2^(FO^2^)+(0.0799P)^2^+2.1378P] WHERE P=(FO^2^+2FC^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1693
_refine_ls_wR_factor_ref         0.1789
_reflns_number_gt                3488
_reflns_number_total             4051
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ja7b08890_si_004.cif
_cod_data_source_block           4
_cod_database_code               4131696
_shelx_res_checksum              34749
_shelx_hkl_checksum              86887