Neutral and Ionic Aluminum, Gallium, and Indium Compounds Carrying Two or Three Terminal Ethynyl Groups
Marcus Schiefer; N. Dastagiri Reddy; Hans-Jürgen Ahn; Andreas Stasch; Herbert W. Roesky; A. Christine Schlicker; Hans-Georg Schmidt; Mathias Noltemeyer; Denis Vidovic; Inorganic Chemistry 42 (2003) 4970–4976; doi:10.1021/ic0342806

data_4313973
_publ_section_title
;
 Neutral and Ionic Aluminum, Gallium, and Indium Compounds Carrying Two or
 Three Terminal Ethynyl Groups
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              4970
_journal_page_last               4976
_journal_paper_doi               10.1021/ic0342806
_journal_volume                  42
_journal_year                    2003
_chemical_formula_sum            'C28.5 H43 Al N2'
_chemical_formula_weight         440.63
_chemical_name_systematic
;
compound 7
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 93.64(8)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   23.65(3)
_cell_length_b                   12.913(4)
_cell_length_c                   18.980(5)
_cell_measurement_temperature    200(2)
_cell_volume                     5785(8)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      200(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_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  0.0737
_diffrn_reflns_av_sigmaI/netI    0.0951
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            6032
_diffrn_reflns_theta_full        22.52
_diffrn_reflns_theta_max         22.52
_diffrn_reflns_theta_min         3.60
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.9746
_exptl_absorpt_correction_T_min  0.9343
_exptl_crystal_density_diffrn    1.012
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1928
_exptl_crystal_size_max          0.80
_exptl_crystal_size_mid          0.60
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.695
_refine_diff_density_min         -0.459
_refine_diff_density_rms         0.077
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     315
_refine_ls_number_reflns         3790
_refine_ls_number_restraints     42
_refine_ls_restrained_S_all      1.037
_refine_ls_R_factor_all          0.1339
_refine_ls_R_factor_gt           0.0962
_refine_ls_shift/su_max          0.014
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1800P)^2^+8.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2510
_refine_ls_wR_factor_ref         0.2958
_reflns_number_gt                2497
_reflns_number_total             3790
_reflns_threshold_expression     2sigma(I)
_cod_data_source_file            ic0342806_07.cif
_cod_data_source_block           r1075
_cod_original_cell_volume        5786(7)
_cod_original_formula_sum        'C28.50 H43 Al N2'
_cod_database_code               4313973