Solid-state thermochromism and phase transitions of charge transfer 1,3-diamino-4,6-dinitrobenzene dyes.
Lee, Jong Hoon; Naumov, Pance; Chung, Ihn Hee; Lee, Sang Cheol; The journal of physical chemistry. A 115 (2011) 10087–10096; doi:10.1021/jp205793b

data_1501763
_publ_section_title
;
 Solid-state thermochromism and phase transitions of charge transfer
 1,3-diamino-4,6-dinitrobenzene dyes.
;
_journal_issue                   35
_journal_name_full               'The journal of physical chemistry. A'
_journal_page_first              10087
_journal_page_last               10096
_journal_paper_doi               10.1021/jp205793b
_journal_volume                  115
_journal_year                    2011
_chemical_formula_sum            'C20 H18 N4 O4'
_chemical_formula_weight         378.38
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                108.1400(10)
_cell_angle_beta                 97.4150(10)
_cell_angle_gamma                104.5810(10)
_cell_formula_units_Z            2
_cell_length_a                   9.6792(13)
_cell_length_b                   10.0246(13)
_cell_length_c                   10.2564(14)
_cell_measurement_temperature    293(2)
_cell_volume                     891.7(2)
_computing_cell_refinement       'APEX2 software (Bruker, 2007)'
_computing_data_collection       'APEX2 software (Bruker, 2007)'
_computing_data_reduction        'SAINT (Bruker, 2007)'
_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      293(2)
_diffrn_measured_fraction_theta_full 0.956
_diffrn_measured_fraction_theta_max 0.956
_diffrn_measurement_device_type  'Bruker SMART APEX2 diffractometer'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  'multilayer confocal TXS mirror'
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0114
_diffrn_reflns_av_sigmaI/netI    0.0209
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            5963
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.23
_exptl_absorpt_coefficient_mu    0.101
_exptl_absorpt_correction_T_max  0.9960
_exptl_absorpt_correction_T_min  0.9811
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.409
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             396
_exptl_crystal_size_max          0.19
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.467
_refine_diff_density_min         -0.212
_refine_diff_density_rms         0.051
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.018
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     261
_refine_ls_number_reflns         3915
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0700
_refine_ls_R_factor_gt           0.0562
_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^)+(0.0779P)^2^+0.3776P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1499
_refine_ls_wR_factor_ref         0.1603
_reflns_number_gt                3095
_reflns_number_total             3915
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jp205793b_si_006.cif
_cod_data_source_block           lee2_1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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 
;
_cod_original_sg_symbol_H-M      P-1
_cod_original_formula_sum        C20H18N4O4
_cod_database_code               1501763