The effect of pressure on the crystal structure of bianthrone
Johnstone, Russell D. L.; Allan, David; Lennie, Alistair; Pidcock, Elna; Valiente, Rafael; Rodríguez, Fernando; Gonzalez, Jesús; Warren, John; Parsons, Simon; Acta Crystallographica Section B 67 (2011) 226–237; doi:10.1107/S0108768111009657

data_2104956
_publ_section_title
;
 The effect of pressure on the crystal structure of bianthrone
;
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              226
_journal_page_last               237
_journal_paper_doi               10.1107/S0108768111009657
_journal_volume                  67
_journal_year                    2011
_chemical_formula_moiety         'C28 H16 O2'
_chemical_formula_sum            'C28 H16 O2'
_chemical_formula_weight         384.43
_chemical_name_common            Bianthrone
_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
_cell_angle_alpha                90
_cell_angle_beta                 109.939(8)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.8354(13)
_cell_length_b                   7.4567(19)
_cell_length_c                   11.3543(12)
_cell_measurement_reflns_used    936
_cell_measurement_temperature    293
_cell_measurement_theta_max      15
_cell_measurement_theta_min      2
_cell_volume                     782.8(2)
_computing_cell_refinement       'USER DEFINED CELL REFINEMENT'
_computing_data_collection       'USER DEFINED DATA COLLECTION'
_computing_data_reduction        'USER DEFINED DATA REDUCTION'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      293
_diffrn_measured_fraction_theta_full 0.718
_diffrn_measured_fraction_theta_max 0.685
_diffrn_measurement_device       Unknown
_diffrn_measurement_device_type  Serial
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  silicon
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.47920
_diffrn_reflns_av_R_equivalents  0.0930
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            3798
_diffrn_reflns_reduction_process
;
 Merged with SORTAV
 R.H. Blessing, (1987) Cryst. Rev. 1, 3-58
;
_diffrn_reflns_theta_full        11.738
_diffrn_reflns_theta_max         15.445
_diffrn_reflns_theta_min         2.272
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.101
_exptl_absorpt_correction_T_max  0.99
_exptl_absorpt_correction_T_min  0.84
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Siemens, 1996)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.631
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             400
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.15
_refine_diff_density_min         -0.16
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   1.0406
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     136
_refine_ls_number_reflns         583
_refine_ls_number_restraints     187
_refine_ls_R_factor_all          0.0655
_refine_ls_R_factor_gt           0.0420
_refine_ls_shift/su_max          0.000179
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details
;
 Method, part 1, Chebychev polynomial, (Watkin, 1994, Prince, 1982)
 [weight] = 1.0/[A~0~*T~0~(x)+A~1~*T~1~(x) ... +A~n-1~]*T~n-1~(x)]
 where A~i~ are the Chebychev coefficients listed below and x= Fcalc/Fmax
 Method = Robust Weighting (Prince, 1982)
 W = [weight] * [1-(deltaF/6*sigmaF)^2^]^2^
 A~i~ are:
 7.77 -6.06 4.02
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0664
_refine_ls_wR_factor_gt          0.0429
_refine_ls_wR_factor_ref         0.0429
_reflns_number_gt                583
_reflns_number_total             772
_reflns_threshold_expression     I>2.0\s(I)
_cod_data_source_file            gw5012.cif
_cod_data_source_block           3.3GPa
_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_values 1698 2011-06-07 10:41:20Z adriana 
;
_cod_original_sg_symbol_H-M      'P 1 21/n 1 '
_cod_database_code               2104956
_cod_database_fobs_code          2104956