Pre-inverse-crowns: synthetic, structural and reactivity studies of alkali metal magnesiates primed for inverse crown formation
Martínez-Martínez, A. J.; Armstrong, D. R.; Conway, B.; Fleming, B. J.; Klett, J.; Kennedy, A. R.; Mulvey, R. E.; Robertson, S. D.; O'Hara, C. T.; Chemical Science 5 (2014) 771–; doi:10.1039/c3sc52816b

data_1513617
_publ_section_title
;
 Pre-inverse-crowns: synthetic, structural and reactivity studies of
 alkali metal magnesiates primed for inverse crown formation
;
_journal_issue                   2
_journal_name_full               'Chemical Science'
_journal_page_first              771
_journal_paper_doi               10.1039/c3sc52816b
_journal_volume                  5
_journal_year                    2014
_chemical_formula_sum            'C168 H342 K6 Mg6 N12'
_chemical_formula_weight         2911.00
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           148
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  '-R 3'
_symmetry_space_group_name_H-M   'R -3 :H'
_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                120.00
_cell_formula_units_Z            3
_cell_length_a                   37.852(2)
_cell_length_b                   37.852(2)
_cell_length_c                   11.5850(6)
_cell_measurement_reflns_used    4520
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      28.8493
_cell_measurement_theta_min      3.2227
_cell_volume                     14374.9(13)
_computing_cell_refinement
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.40 (release 27-08-2010 CrysAlis171 .NET)
(compiled Aug 27 2010,11:50:40)
;
_computing_data_collection
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.40 (release 27-08-2010 CrysAlis171 .NET)
(compiled Aug 27 2010,11:50:40)
;
_computing_data_reduction
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.40 (release 27-08-2010 CrysAlis171 .NET)
(compiled Aug 27 2010,11:50:40)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device_type  'Oxford Diffraction Xcalibur, E'
_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  0.0314
_diffrn_reflns_av_sigmaI/netI    0.0634
_diffrn_reflns_limit_h_max       48
_diffrn_reflns_limit_h_min       -29
_diffrn_reflns_limit_k_max       47
_diffrn_reflns_limit_k_min       -48
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            14300
_diffrn_reflns_theta_full        26.99
_diffrn_reflns_theta_max         26.99
_diffrn_reflns_theta_min         4.17
_exptl_absorpt_coefficient_mu    0.202
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.98736
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.40 (release 27-08-2010 CrysAlis171 .NET)
(compiled Aug 27 2010,11:50:40)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.009
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             4860
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.548
_refine_diff_density_min         -0.565
_refine_diff_density_rms         0.059
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.021
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     312
_refine_ls_number_reflns         6852
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.021
_refine_ls_R_factor_all          0.1005
_refine_ls_R_factor_gt           0.0621
_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^)+(0.0721P)^2^+32.5533P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1475
_refine_ls_wR_factor_ref         0.1734
_reflns_number_gt                4631
_reflns_number_total             6852
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            c3sc52816b.txt
_cod_data_source_block           srbf1208
_cod_original_sg_symbol_H-M      R-3
_cod_database_code               1513617