Synthesis and structures of neutral and cationic 1-azaallylaluminium methyls †
Bourget, Laurence; Hitchcock, Peter B.; Lappert, Michael F.; Journal of the Chemical Society, Dalton Transactions  (1999) 2645–; doi:10.1039/a904138i

data_7027565
_publ_section_title
;
 Synthesis and structures of neutral and cationic 1-azaallylaluminium
 methyls&#x200A;&#x2020;
;
_journal_issue                   16
_journal_name_full
'Journal of the Chemical Society, Dalton Transactions'
_journal_page_first              2645
_journal_paper_doi               10.1039/a904138i
_journal_year                    1999
_chemical_formula_sum            'C25 H59 Al N2 Si4'
_chemical_formula_weight         527.08
_chemical_name_common            '[Al{Me3SiNC(tBu)CHSiMe3}2]'
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 101.96(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.360(4)
_cell_length_b                   20.099(5)
_cell_length_c                   15.366(8)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      10
_cell_measurement_theta_min      7
_cell_volume                     3432(2)
_computing_cell_refinement       'Enraf-Nonius CAD4'
_computing_data_collection       'Enraf-Nonius CAD4'
_computing_molecular_graphics    'CAMERON (Watkin and Pearce,1993)'
_computing_publication_material  SHELXL-93
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_method       \w--2\q
_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  0.0314
_diffrn_reflns_av_sigmaI/netI    0.0556
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            6343
_diffrn_reflns_theta_full        24.98
_diffrn_reflns_theta_max         24.98
_diffrn_reflns_theta_min         2.03
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  120
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    0.214
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.020
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1168
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.297
_refine_diff_density_min         -0.254
_refine_diff_density_rms         0.049
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.976
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     298
_refine_ls_number_reflns         6033
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.976
_refine_ls_R_factor_all          0.0658
_refine_ls_R_factor_gt           0.0429
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0425P)^2^+2.1652P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0983
_refine_ls_wR_factor_ref         0.1095
_reflns_number_gt                4592
_reflns_number_total             6033
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            904138isup1.cif
_cod_data_source_block           mar799
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7027565