Structural characterization of <i>p</i>-benzosemiquinone radical in a solid state: the radical stabilization by a low-barrier hydrogen bond
Krešimir Molčanov; Mario Roboz; Biserka Kojić-Prodić; Acta Crystallographica Section B 62 (2006) 1051–1060; doi:10.1107/S0108768106038870

data_2100716
_publ_section_title
;
 Structural characterization of <i>p</i>-benzosemiquinone radical in a
 solid state: the radical stabilization by a low-barrier hydrogen bond
;
_journal_coeditor_code           WS5041
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              1051
_journal_page_last               1060
_journal_paper_doi               10.1107/S0108768106038870
_journal_volume                  62
_journal_year                    2006
_chemical_formula_moiety         'C6 H5 O2'
_chemical_formula_sum            'C6 H5 O2'
_chemical_formula_weight         109.1
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 109.99(8)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   3.770(3)
_cell_length_b                   5.980(3)
_cell_length_c                   11.458(14)
_cell_measurement_reflns_used    16
_cell_measurement_temperature    90(2)
_cell_measurement_theta_max      25.8
_cell_measurement_theta_min      8.2
_cell_volume                     242.8(4)
_computing_cell_refinement       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_collection       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1986)'
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 1
_diffrn_measurement_device       '\k-geometry diffractometer'
_diffrn_measurement_device_type  'Enraf Nonius CAD4'
_diffrn_measurement_method       'non-profiled omega/2theta scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.1017
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       0
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -4
_diffrn_reflns_number            531
_diffrn_reflns_theta_full        75.78
_diffrn_reflns_theta_max         75.78
_diffrn_reflns_theta_min         8.23
_diffrn_standards_decay_%        2
_diffrn_standards_interval_time  120
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.948
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.492
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             114
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.07
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.33
_refine_diff_density_min         -0.416
_refine_ls_extinction_coef       0.053(13)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.087
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     50
_refine_ls_number_reflns         507
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.087
_refine_ls_R_factor_gt           0.0466
_refine_ls_shift/su_max          0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0849P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.131
_reflns_number_gt                382
_reflns_number_total             507
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ws5041.cif
_cod_data_source_block           sqm90k
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2100716