Intramolecular (electron) delocalization between aromatic donors and their tethered cation‒radicals. Application of electrochemical and structural probes†
Sun, Duoli; Lindeman, Sergey V.; Rathore, Rajendra; Kochi, Jay K.; Journal of the Chemical Society, Perkin Transactions 2  (2001) 1585–; doi:10.1039/b103139m

data_7216977
_publ_section_title
;
 Intramolecular (electron) delocalization between aromatic donors and
 their tethered cation--radicals. Application of electrochemical and
 structural probes&#x2020;
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_journal_issue                   9
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 2'
_journal_page_first              1585
_journal_paper_doi               10.1039/b103139m
_journal_year                    2001
_chemical_compound_source        'chemical synthesis'
_chemical_formula_sum            'C18 H22 O4'
_chemical_formula_weight         302.36
_chemical_name_systematic
; 
2,2',5,5'-tetramethoxy-4,4'-dimethylbiphenyl 
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 109.848(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   22.1995(12)
_cell_length_b                   5.8270(3)
_cell_length_c                   12.6965(7)
_cell_measurement_reflns_used    3151
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      36
_cell_measurement_theta_min      2
_cell_volume                     1544.81(14)
_computing_cell_refinement       'SAINT V4.050 (Siemens, 1989-95)'
_computing_data_collection       'SMART V4.050 (Siemens, 1989-95)'
_computing_data_reduction        'SAINT & SADABS V2.03 (Sheldrick, 2000)'
_computing_molecular_graphics    'XP V5.06 (Siemens, 1996)'
_computing_publication_material  'SHELXL-93 & XCIF V5.05 (Siemens, 1996)'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      123(2)
_diffrn_measurement_device       'Siemens/Bruker SMART 1K'
_diffrn_measurement_method
;
\w-scan, frame range 0.3 deg, hemisphere
;
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0628
_diffrn_reflns_av_sigmaI/netI    0.0668
_diffrn_reflns_limit_h_max       33
_diffrn_reflns_limit_h_min       -35
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            10207
_diffrn_reflns_theta_max         36.07
_diffrn_reflns_theta_min         1.95
_exptl_absorpt_coefficient_mu    0.091
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.646
_exptl_absorpt_correction_type   'Semi-empirical (SADABS procedure)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.300
_exptl_crystal_density_method    none
_exptl_crystal_description       prism
_exptl_crystal_F_000             648
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.391
_refine_diff_density_min         -0.251
_refine_diff_density_rms         0.065
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   0.982
_refine_ls_goodness_of_fit_obs   1.040
_refine_ls_hydrogen_treatment
;
riding and rotating model with Uiso=1.2Uiso/eq of an adjacent atom
(1.5Uiso/eq for Me-hydrogens)
;
_refine_ls_matrix_type           full
_refine_ls_number_parameters     103
_refine_ls_number_reflns         3426
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.026
_refine_ls_restrained_S_obs      1.040
_refine_ls_R_factor_all          0.1218
_refine_ls_R_factor_obs          0.0584
_refine_ls_shift/esd_max         0.009
_refine_ls_shift/esd_mean        0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0769P)^2^+0.7019P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1851
_refine_ls_wR_factor_obs         0.1374
_reflns_number_observed          1847
_reflns_number_total             3439
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            b103139m.txt
_cod_data_source_block           raj-usx
_cod_depositor_comments
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The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0769P)^2^+0.7019P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0769P)^2^+0.7019P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
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_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7216977