Quinones as Electron Acceptors. X-Ray Structures, Spectral (EPR, UV-vis) Characteristics and Electron-Transfer Reactivities of Their Reduced Anion Radicals as Separated vs Contact Ion Pairs
Jian-Ming Lü; Sergiy V. Rosokha; Ivan S. Neretin; Jay K. Kochi; Journal of the American Chemical Society 128 (2006) 16708–16719; doi:10.1021/ja066471o

data_4111289
_publ_section_title
;
 Quinones as Electron Acceptors. X-Ray Structures, Spectral (EPR, UV-vis)
 Characteristics and Electron-Transfer Reactivities of Their Reduced Anion
 Radicals as Separated vs Contact Ion Pairs
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              16708
_journal_page_last               16719
_journal_paper_doi               10.1021/ja066471o
_journal_volume                  128
_journal_year                    2006
_chemical_formula_moiety         'C38 H52 K O9, 2(C4 H8 O)'
_chemical_formula_sum            'C46 H68 K O11'
_chemical_formula_weight         836.10
_chemical_name_common            'DBCrown K 2,6-DBBQ'
_chemical_name_systematic
; 
 Dibenzo-18-crown-6 tetrahydrofuran potassium 
 2,6-di-tert-butylbenzoquinonide, tetrahydrofuran solvate
;
_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                 109.204(14)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.238(3)
_cell_length_b                   17.760(4)
_cell_length_c                   17.190(3)
_cell_measurement_reflns_used    527
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      11.55
_cell_measurement_theta_min      1.06
_cell_volume                     4681.5(16)
_computing_cell_refinement       'SAINT V6.28 (BrukerAXS, 1997-2001)'
_computing_data_collection       'SMART V5.630 (BrukerAXS, 1997-2001)'
_computing_data_reduction        'SAINT & SADABS V2.06 (Sheldrick, 2000)'
_computing_molecular_graphics    'XP V5.06 (BrukerAXS, 1997-99)'
_computing_publication_material  'SHELXL-93, XCIF V5.05 (BrukerAXS, 1997-99)'
_computing_structure_refinement  'SHELXTL v. 6.12 (Sheldrick, 2001)'
_computing_structure_solution    'SHELXTL v. 6.12 (Sheldrick, 2001)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.959
_diffrn_measurement_device       'Siemens SMART'
_diffrn_measurement_method
;
\w-scan, frame range 0.3 deg, hemisphere
;
_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  0.0706
_diffrn_reflns_av_sigmaI/netI    0.0837
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            71198
_diffrn_reflns_theta_full        30.00
_diffrn_reflns_theta_max         31.04
_diffrn_reflns_theta_min         1.70
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         none
_exptl_absorpt_coefficient_mu    0.169
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.186
_exptl_crystal_description       prism
_exptl_crystal_F_000             1804
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.915
_refine_diff_density_min         -0.395
_refine_diff_density_rms         0.074
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.916
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     512
_refine_ls_number_reflns         14350
_refine_ls_number_restraints     27
_refine_ls_restrained_S_all      0.953
_refine_ls_R_factor_all          0.1243
_refine_ls_R_factor_gt           0.0647
_refine_ls_shift/su_max          0.007
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1054P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1751
_refine_ls_wR_factor_ref         0.1953
_reflns_number_gt                7025
_reflns_number_total             14350
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja066471osi20060907_104048.cif
_cod_data_source_block           lu19
_cod_database_code               4111289