Alkaline-Earth Metal Alkylaluminate Chemistry Revisited
Michel, Olaf; Meermann, Christian; Törnroos, Karl W.; Anwander, Reiner; Organometallics 28 (2009) 4783–; doi:10.1021/om900342h

data_4069658
_publ_section_title
;
 Alkaline-Earth Metal Alkylaluminate Chemistry Revisited
;
_journal_issue                   16
_journal_name_full               Organometallics
_journal_page_first              4783
_journal_paper_doi               10.1021/om900342h
_journal_volume                  28
_journal_year                    2009
_chemical_formula_moiety         'C20 H32 Al2 Ca N2'
_chemical_formula_sum            'C20 H32 Al2 Ca N2'
_chemical_formula_weight         394.52
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 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                 122.767(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   19.9737(9)
_cell_length_b                   11.1587(5)
_cell_length_c                   12.2837(6)
_cell_measurement_reflns_used    7482
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      25.15
_cell_measurement_theta_min      2.19
_cell_volume                     2302.15(19)
_computing_cell_refinement
;
Bruker (2004). SAINT, version 6.45a, Bruker AXS Inc., Madison, 
Wisconsin, USA.
;
_computing_data_collection
;
Bruker (1999). SMART, version 5.054, Bruker AXS Inc., Madison, 
Wisconsin, USA.
;
_computing_data_reduction
;
Bruker (2004). SAINT, version 6.45a, Bruker AXS Inc., Madison, 
Wisconsin, USA.
;
_computing_molecular_graphics
;
Brandenburg, K. (2007). DIAMOND. Version 3.1. Crystal Impact GbR, Bonn, 
Germany.
;
_computing_publication_material
;
Bruker AXS (2003). SHELXTL. Version 6.14. Bruker AXS Inc., Madison, 
Wisconsin, USA.
;
_computing_structure_refinement
;
Sheldrick, G. M. (2008). Acta Crystallographica, A64, 112-122.
;
_computing_structure_solution
;     
Sheldrick, G. M. (2008). Acta Crystallographica, A64, 112-122.
;
_diffrn_ambient_temperature      123(2)
_diffrn_detector_area_resol_mean '48 \um'
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker-AXS SMART 2K CCD'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0340
_diffrn_reflns_av_sigmaI/netI    0.0350
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            13305
_diffrn_reflns_theta_full        25.15
_diffrn_reflns_theta_max         25.15
_diffrn_reflns_theta_min         2.19
_exptl_absorpt_coefficient_mu    0.354
_exptl_absorpt_correction_T_max  0.9903
_exptl_absorpt_correction_T_min  0.9329
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details
;
SADABS version 2008/1, G.M Sheldrick, University of 
G\"ttingen, Germany, 1996. 
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.138
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             848
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.318
_refine_diff_density_min         -0.226
_refine_diff_density_rms         0.043
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.32(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.049
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     253
_refine_ls_number_reflns         4133
_refine_ls_number_restraints     121
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0616
_refine_ls_R_factor_gt           0.0422
_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^)+(0.0269P)^2^+2.7888P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0833
_refine_ls_wR_factor_ref         0.0928
_reflns_number_gt                3250
_reflns_number_total             4133
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            om900342h_si_001.cif
_cod_data_source_block           Compound5
_cod_original_cell_volume        2302.15(18)
_cod_original_sg_symbol_H-M      'C c'
_cod_database_code               4069658