Crystallographic characterisation of binary alkali metal alkoxide magnesium bis(alkyl) mixtures: differential binding of Na+ and K+ to a common dinuclear diorganomagnesiate
Robert Mulvey; Nicholas D.R. Barnett; William Clegg; Alan R. Kennedy; Susan Weatherstone; Chemical Communications  (2005) –; doi:10.1039/b413191f

data_7101137
_publ_section_title
;
Crystallographic characterisation of binary alkali
metal alkoxide magnesium bis(alkyl) mixtures:    differential binding of
Na+ and K+ to a common dinuclear diorganomagnesiate
;
_journal_issue                   3
_journal_name_full               'Chemical Communications'
_journal_paper_doi               10.1039/b413191f
_journal_year                    2005
_chemical_formula_sum            'C36 H86 K2 Mg2 N4 O2'
_chemical_formula_weight         733.91
_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                 103.391(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   11.4984(6)
_cell_length_b                   14.7210(11)
_cell_length_c                   14.4940(10)
_cell_measurement_reflns_used    4224
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      25.03
_cell_measurement_theta_min      2.91
_cell_volume                     2386.7(3)
_computing_data_collection       'Denzo & Collect'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       'phi and 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  0.088
_diffrn_reflns_av_sigmaI/netI    0.1023
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            22825
_diffrn_reflns_theta_full        24.98
_diffrn_reflns_theta_max         24.98
_diffrn_reflns_theta_min         3.12
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.255
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.021
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             816
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.598
_refine_diff_density_min         -0.463
_refine_diff_density_rms         0.057
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.022
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     221
_refine_ls_number_reflns         4156
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.022
_refine_ls_R_factor_all          0.1612
_refine_ls_R_factor_gt           0.0762
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0700P)^2^+3.2000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1597
_refine_ls_wR_factor_ref         0.1964
_reflns_number_gt                2212
_reflns_number_total             4156
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            b413191f.txt
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'MONOCLINIC' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               7101137