A Homologous Series of Regioselectively Tetradeprotonated Group 8 Metallocenes: New Inverse Crown Ring Compounds Synthesized via a Mixed Sodium-Magnesium Tris(diisopropylamide) Synergic Base
Prokopis C. Andrikopoulos; David R. Armstrong; William Clegg; Carly J. Gilfillan; Eva Hevia; Alan R. Kennedy; Robert E. Mulvey; Charles T. O'Hara; John A. Parkinson; Duncan M. Tooke; Journal of the American Chemical Society 126 (2004) 11612–11620; doi:10.1021/ja0472230

data_4112948
_publ_section_title
;
 A Homologous Series of Regioselectively Tetradeprotonated Group 8
 Metallocenes: New Inverse Crown Ring Compounds Synthesized via a Mixed
 Sodium-Magnesium Tris(diisopropylamide) Synergic Base
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              11612
_journal_page_last               11620
_journal_paper_doi               10.1021/ja0472230
_journal_volume                  126
_journal_year                    2004
_chemical_formula_moiety         'C58 H118 Mg4 N8 Na4 Os'
_chemical_formula_sum            'C58 H118 Mg4 N8 Na4 Os'
_chemical_formula_weight         1307.00
_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                 117.255(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   16.1472(2)
_cell_length_b                   15.1476(2)
_cell_length_c                   16.1729(2)
_cell_measurement_reflns_used    19574
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      21.97
_cell_measurement_theta_min      1.02
_cell_volume                     3516.57(8)
_computing_cell_refinement       'HKL DENZO'
_computing_data_collection       'Nonius COLLECT'
_computing_data_reduction        'HKL DENZO and SCALEPACK'
_computing_publication_material  'SHELXL97 and WinGX'
_computing_structure_refinement  SHELXL97
_computing_structure_solution    SIR
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Nonius KappaCCD diffractometer'
_diffrn_measurement_method       '\f and \w 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  0.0330
_diffrn_reflns_av_sigmaI/netI    0.0178
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            85043
_diffrn_reflns_theta_full        30.08
_diffrn_reflns_theta_max         30.08
_diffrn_reflns_theta_min         2.00
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.912
_exptl_absorpt_correction_T_max  1.093
_exptl_absorpt_correction_T_min  0.863
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
R.H. Blessing, Acta Cryst. (1995), A51, 33-38
denzox & scalepack
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.234
_exptl_crystal_description       prism
_exptl_crystal_F_000             1380
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.738
_refine_diff_density_min         -1.127
_refine_diff_density_rms         0.062
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.043
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     368
_refine_ls_number_reflns         10255
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.043
_refine_ls_R_factor_all          0.0278
_refine_ls_R_factor_gt           0.0203
_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^)+(0.0244P)^2^+1.9425P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0482
_refine_ls_wR_factor_ref         0.0502
_reflns_number_gt                8647
_reflns_number_total             10255
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ja0472230si20040712_113051_3.cif
_cod_data_source_block           3
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               4112948