Photodimerization of chromone.
Sakamoto, Masami; Kanehiro, Masayuki; Mino, Takashi; Fujita, Tsutomu; Chemical communications (Cambridge, England) 34 (2009) 2379–2380; doi:10.1039/b822829a

data_7104362
_publ_section_title
;
 Photodimerization of chromone.
;
_journal_issue                   17
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              2379
_journal_page_last               2380
_journal_paper_doi               10.1039/b822829a
_journal_volume                  34
_journal_year                    2009
_chemical_formula_sum            'C18 H12 O4'
_chemical_formula_weight         292.28
_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                 103.7710(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   14.8002(10)
_cell_length_b                   8.2800(6)
_cell_length_c                   22.2830(19)
_cell_measurement_reflns_used    2242
_cell_measurement_temperature    173
_cell_measurement_theta_max      27.32
_cell_measurement_theta_min      2.83
_cell_volume                     2652.2(3)
_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      173
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.903
_diffrn_measurement_device_type  'APEX II 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
_diffrn_reflns_av_R_equivalents  0.0244
_diffrn_reflns_av_sigmaI/netI    0.0305
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            7287
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         28.37
_diffrn_reflns_theta_min         1.88
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_T_max  0.9897
_exptl_absorpt_correction_T_min  0.9596
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS Sheldrick 1996'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.464
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1216
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.283
_refine_diff_density_min         -0.340
_refine_diff_density_rms         0.078
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     199
_refine_ls_number_reflns         3007
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.0562
_refine_ls_R_factor_gt           0.0420
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0581P)^2^+0.8038P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1053
_refine_ls_wR_factor_ref         0.1125
_reflns_number_gt                2306
_reflns_number_total             3007
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b822829a.txt
_cod_data_source_block           saka91b_c2c
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7104362