Tris(pyrazolyl)borate Complexes of the Alkaline-Earth Metals: Alkylaluminate Precursors and Schlenk-Type Rearrangements
Michel, Olaf; Dietrich, H. Martin; Litlabø, Rannveig; Törnroos, Karl W.; Maichle-Mössmer, Cäcilia; Anwander, Reiner; Organometallics 31 (2012) 3119–; doi:10.1021/om300032c

data_4078006
_publ_section_title
;
 Tris(pyrazolyl)borate Complexes of the Alkaline-Earth Metals:
 Alkylaluminate Precursors and Schlenk-Type Rearrangements
;
_journal_issue                   8
_journal_name_full               Organometallics
_journal_page_first              3119
_journal_paper_doi               10.1021/om300032c
_journal_volume                  31
_journal_year                    2012
_chemical_formula_moiety         'C16 H25 B Mg N6'
_chemical_formula_sum            'C16 H25 B Mg N6'
_chemical_formula_weight         336.54
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           62
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2n'
_symmetry_space_group_name_H-M   'P n m a'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   19.1953(2)
_cell_length_b                   13.3301(7)
_cell_length_c                   7.8030(5)
_cell_measurement_reflns_used    10801
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      58.71
_cell_measurement_theta_min      5.19
_cell_volume                     1996.59(17)
_computing_cell_refinement       X-AREA
_computing_data_collection       X-AREA
_computing_data_reduction        X-AREA
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Stoe-IPDS II'
_diffrn_measurement_method       omega-scans
_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  0.0727
_diffrn_reflns_av_sigmaI/netI    0.0227
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            22305
_diffrn_reflns_theta_full        24.41
_diffrn_reflns_theta_max         24.41
_diffrn_reflns_theta_min         3.02
_exptl_absorpt_coefficient_mu    0.098
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.120
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.256
_refine_diff_density_min         -0.273
_refine_diff_density_rms         0.045
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.356
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     127
_refine_ls_number_reflns         1715
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.356
_refine_ls_R_factor_all          0.0729
_refine_ls_R_factor_gt           0.0677
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0368P)^2^+2.1689P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1494
_refine_ls_wR_factor_ref         0.1515
_reflns_number_gt                1591
_reflns_number_total             1715
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om300032c_si_001.cif
_cod_data_source_block           Compound2
_cod_original_sg_symbol_H-M      Pnma
_cod_database_code               4078006