Combination vs. disproportionation in dialkyl biradicals. Selectivity reversal in a crystalline solid.
Choe, Tina; Khan, Saeed I.; Garcia-Garibay, Miguel A; Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology 5 (2006) 449–451; doi:10.1039/b603909j

data_1516186
_publ_section_title
;
 Combination vs. disproportionation in dialkyl biradicals. Selectivity
 reversal in a crystalline solid.
;
_journal_issue                   5
_journal_name_full
'Photochemical &amp; photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology'
_journal_page_first              449
_journal_page_last               451
_journal_paper_doi               10.1039/b603909j
_journal_volume                  5
_journal_year                    2006
_chemical_formula_moiety         'C22 H22 O4'
_chemical_formula_sum            'C22 H22 O4'
_chemical_formula_weight         350.40
_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-97
_cell_angle_alpha                90.00
_cell_angle_beta                 117.603(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   25.049(3)
_cell_length_b                   11.3809(12)
_cell_length_c                   14.7771(15)
_cell_measurement_reflns_used    5564
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      26.99
_cell_measurement_theta_min      2.27
_cell_volume                     3733.2(7)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_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      298(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.973
_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
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_diffrn_reflns_limit_h_max       33
_diffrn_reflns_limit_h_min       -33
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            16369
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         28.31
_diffrn_reflns_theta_min         1.83
_exptl_absorpt_coefficient_mu    0.085
_exptl_absorpt_correction_T_max  0.9668
_exptl_absorpt_correction_T_min  0.9130
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sadabs (Bruker)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.247
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1488
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.46
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.269
_refine_diff_density_min         -0.241
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_refine_ls_extinction_method     none
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_refine_ls_number_reflns         4536
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0817
_refine_ls_R_factor_gt           0.0493
_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^)+(0.0774P)^2^+1.3792P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1376
_refine_ls_wR_factor_ref         0.1607
_reflns_number_gt                2885
_reflns_number_total             4536
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b603909j.txt
_cod_data_source_block           (Z)-2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               1516186