4-Methoxy- and 4-cyano-substituted lithium aryloxides: electronic effects of substituents on aggregation.
MacDougall, Dugald J.; Noll, Bruce C.; Kennedy, Alan R.; Henderson, Kenneth W.; Dalton transactions (Cambridge, England : 2003)  (2006) 1875–1884; doi:10.1039/b515011f

data_7006879
_publ_section_title
;
 4-Methoxy- and 4-cyano-substituted lithium aryloxides: electronic
 effects of substituents on aggregation.
;
_journal_issue                   15
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              1875
_journal_page_last               1884
_journal_paper_doi               10.1039/b515011f
_journal_year                    2006
_chemical_formula_moiety         '2(C30 H40 Li2 N2 O6)'
_chemical_formula_sum            'C60 H80 Li4 N4 O12'
_chemical_formula_weight         1077.04
_chemical_name_common            'Lithium 4-cyanophenoxide THF solvate'
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      29
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   19.0800(9)
_cell_length_b                   19.4540(9)
_cell_length_c                   16.0843(8)
_cell_measurement_reflns_used    9813
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.2545
_cell_measurement_theta_min      2.482
_cell_volume                     5970.2(5)
_computing_cell_refinement       'SMART/SAINT (Bruker, 2001)'
_computing_data_collection       'SMART (Bruker, 2001)'
_computing_data_reduction        'SAINT/XPREP (Bruker, 2001; Sheldrick, 2003)'
_computing_molecular_graphics    'XP (Sheldrick, 1998)'
_computing_publication_material  'XCIF (Sheldrick, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'XS (Sheldrick, 2001)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.33
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'BRUKER SMART APEX CCD area detector'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0266
_diffrn_reflns_av_sigmaI/netI    0.0250
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            61781
_diffrn_reflns_theta_full        28.30
_diffrn_reflns_theta_max         28.30
_diffrn_reflns_theta_min         1.96
_diffrn_source                   'fine-focus sealed tube'
_diffrn_source_type              'Siemens KFFMO2K-90'
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  0.9604
_exptl_absorpt_correction_T_min  0.9451
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'Blessing, R. H. (1995) Acta Cryst. A51, 33-38.'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.198
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             2304
_exptl_crystal_recrystallization_method
'Slow cooling of a saturated THF solution in a water bath from 340K to ambient '
_exptl_crystal_size_max          0.70
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.50
_refine_diff_density_max         0.519
_refine_diff_density_min         -0.333
_refine_diff_density_rms         0.046
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.57(18)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     752
_refine_ls_number_reflns         14821
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.046
_refine_ls_R_factor_all          0.0528
_refine_ls_R_factor_gt           0.0447
_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^)+(0.0742P)^2^+0.8961P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1178
_refine_ls_wR_factor_ref         0.1244
_reflns_number_gt                12981
_reflns_number_total             14821
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b515011f.txt
_cod_data_source_block           kwh202a
_cod_database_code               7006879