On the origin of the solid-state thermochromism and thermal fatigue of polycyclic overcrowded enes.
Naumov, Panče; Ishizawa, Nobuo; Wang, Jun; Pejov, Ljupčo; Pumera, Martin; Lee, Sang Cheol; The journal of physical chemistry. A 115 (2011) 8563–8570; doi:10.1021/jp2040339

data_1501741
_publ_section_title
;
 On the origin of the solid-state thermochromism and thermal fatigue of
 polycyclic overcrowded enes.
;
_journal_issue                   30
_journal_name_full               'The journal of physical chemistry. A'
_journal_page_first              8563
_journal_page_last               8570
_journal_paper_doi               10.1021/jp2040339
_journal_volume                  115
_journal_year                    2011
_chemical_formula_moiety         'C28 H16 O2'
_chemical_formula_sum            'C28 H16 O2'
_chemical_formula_weight         384.41
_chemical_name_common            bainthrone
_chemical_name_systematic
;
9,9'-bi-9(10H)-anthracenylidene-10,1'-dione
;
_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           'Manual editing of SHELXL-97'
_cell_angle_alpha                90.00
_cell_angle_beta                 109.729(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   10.2759(11)
_cell_length_b                   8.6249(9)
_cell_length_c                   11.6667(11)
_cell_measurement_temperature    508(2)
_cell_volume                     973.31(17)
_computing_cell_refinement       'APEX2-W2K/NT (Bruker, 2006)'
_computing_data_collection       'APEX2-W2K/NT (Bruker, 2006)'
_computing_data_reduction        'APEX2-W2K/NT (Bruker, 2006)'
_computing_molecular_graphics    'DIAMOND (Brandenburg, 2005)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      508(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEX CCD diffractometer'
_diffrn_measurement_method       '\w scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0546
_diffrn_reflns_av_sigmaI/netI    0.0618
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            4814
_diffrn_reflns_theta_full        23.25
_diffrn_reflns_theta_max         23.25
_diffrn_reflns_theta_min         2.29
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  0.9839
_exptl_absorpt_correction_T_min  0.9799
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'APEX2-W2K/NT (Bruker, 2006)'
_exptl_crystal_colour            green
_exptl_crystal_density_diffrn    1.312
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       parallelepiped
_exptl_crystal_F_000             400
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.106
_refine_diff_density_min         -0.136
_refine_diff_density_rms         0.033
_refine_ls_extinction_coef       0.033(4)
_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   0.927
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     137
_refine_ls_number_reflns         1389
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.927
_refine_ls_R_factor_all          0.1087
_refine_ls_R_factor_gt           0.0437
_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^)+(0.0517P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0910
_refine_ls_wR_factor_ref         0.1129
_reflns_number_gt                737
_reflns_number_total             1389
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jp2040339_si_012.cif
_cod_data_source_block           s
_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 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               1501741