Straightforward synthesis of rubidium bis(trimethylsilyl)amide and complexes of the alkali metal bis(trimethylsilyl)amides with weakly coordinating 2,2,5,5-tetramethyltetrahydrofuran.
Krieck, Sven; Schüler, Philipp; Görls, Helmar; Westerhausen, Matthias; Dalton transactions (Cambridge, England : 2003) 47 (2018) 12562–12569; doi:10.1039/c8dt01539b

data_7046403
_publ_section_title
;
 Straightforward synthesis of rubidium bis(trimethylsilyl)amide and
 complexes of the alkali metal bis(trimethylsilyl)amides with weakly
 coordinating 2,2,5,5-tetramethyltetrahydrofuran.
;
_journal_issue                   36
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              12562
_journal_page_last               12569
_journal_paper_doi               10.1039/c8dt01539b
_journal_volume                  47
_journal_year                    2018
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C28 H68 N2 O2 Rb2 Si4'
_chemical_formula_sum            'C28 H68 N2 O2 Rb2 Si4'
_chemical_formula_weight         748.14
_space_group_IT_number           29
_space_group_name_Hall           'P 2c -2ac'
_space_group_name_H-M_alt        'P c a 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2018-04-18 deposited with the CCDC.
2018-05-18 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   15.2966(2)
_cell_length_b                   12.6481(2)
_cell_length_c                   21.0977(5)
_cell_measurement_reflns_used    31138
_cell_measurement_temperature    133(2)
_cell_measurement_theta_max      27.47
_cell_measurement_theta_min      1.61
_cell_volume                     4081.83(13)
_computing_cell_refinement       DENZO
_computing_data_collection       COLLECT
_computing_data_reduction        DENZO
_computing_molecular_graphics    SHELXTL/PC
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      133(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       'phi- + omega-scan'
_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  0.0662
_diffrn_reflns_av_sigmaI/netI    0.0487
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            31138
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         1.61
_exptl_absorpt_coefficient_mu    2.539
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6299
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, Bruker-AXS, 2002'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.217
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1584
_exptl_crystal_size_max          0.112
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.082
_refine_diff_density_max         0.369
_refine_diff_density_min         -0.325
_refine_diff_density_rms         0.076
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.372(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.104
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     364
_refine_ls_number_reflns         9354
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.104
_refine_ls_R_factor_all          0.0551
_refine_ls_R_factor_gt           0.0404
_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^)+(0.0000P)^2^+5.7968P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0647
_refine_ls_wR_factor_ref         0.0702
_reflns_number_gt                7979
_reflns_number_total             9354
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c8dt01539b2.cif
_cod_data_source_block           FO6549
_cod_depositor_comments
'Adding full bibliography for 7046399--7046403.cif.'
_cod_database_code               7046403