Synthesis, Structure, and Catalytic Studies of Mixed Lithium−Magnesium and Sodium−Magnesium Complexes: Highly Isospecific Initiators for Polymerization of Methyl Methacrylate
Hsueh, Mao-Lin; Ko, Bao-Tsan; Athar, Taimur; Lin, Chu-Chieh; Wu, Tzong-Ming; Hsu, Sung-Fu; Organometallics 25 (2006) 4144–; doi:10.1021/om0603363

data_4075513
_publ_section_title
;
 Synthesis, Structure, and Catalytic Studies of Mixed
 Lithium&#x2212;Magnesium and Sodium&#x2212;Magnesium Complexes:&#x00A0;
 Highly Isospecific Initiators for Polymerization of Methyl Methacrylate
;
_journal_issue                   17
_journal_name_full               Organometallics
_journal_page_first              4144
_journal_paper_doi               10.1021/om0603363
_journal_volume                  25
_journal_year                    2006
_chemical_formula_sum            'C90 H134 Li2 Mg2 O8'
_chemical_formula_weight         1406.47
_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                 109.371(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   23.051(2)
_cell_length_b                   17.2273(16)
_cell_length_c                   24.441(2)
_cell_measurement_reflns_used    4317
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      19.875
_cell_measurement_theta_min      2.411
_cell_volume                     9156.2(14)
_computing_cell_refinement       'Bruker SAINT (Siemens, 1996)'
_computing_data_collection       'Bruker SMART (Siemens 1996)'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'CCD area detector'
_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  0.1033
_diffrn_reflns_av_sigmaI/netI    0.1541
_diffrn_reflns_limit_h_max       27
_diffrn_reflns_limit_h_min       -28
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            51394
_diffrn_reflns_theta_full        26.06
_diffrn_reflns_theta_max         26.06
_diffrn_reflns_theta_min         1.90
_exptl_absorpt_coefficient_mu    0.075
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.020
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       parallelpied
_exptl_crystal_F_000             3072
_exptl_crystal_size_max          0.56
_exptl_crystal_size_mid          0.49
_exptl_crystal_size_min          0.33
_refine_diff_density_max         0.361
_refine_diff_density_min         -0.231
_refine_diff_density_rms         0.038
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.964
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     946
_refine_ls_number_reflns         18028
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.964
_refine_ls_R_factor_all          0.2124
_refine_ls_R_factor_gt           0.0631
_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^)+(0.0500P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1327
_refine_ls_wR_factor_ref         0.1664
_reflns_number_gt                5756
_reflns_number_total             18028
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om0603363si20060602_051038.cif
_cod_data_source_block           salm04m
_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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        9156.6(15)
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               4075513