Reversible luminescence switching between single and dual emissions of bipyridinium-type organic crystals
Xu-Hui Jin; Cai-Xia Ren; Jian-Ke Sun; Xue-Jun Zhou; Li-Xuan Cai; Jie Zhang; Chem.Commun. 48 (2012) 10422–; doi:10.1039/c2cc35685f

data_7108474
_publ_section_title
;
 Reversible luminescence switching between single and dual emissions of
 bipyridinium-type organic crystals
;
_journal_name_full               Chem.Commun.
_journal_page_first              10422
_journal_paper_doi               10.1039/c2cc35685f
_journal_volume                  48
_journal_year                    2012
_chemical_formula_moiety         'C18 H16 N2 O3'
_chemical_formula_sum            'C18 H16 N2 O3'
_chemical_formula_weight         308.33
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 110.977(16)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.338(7)
_cell_length_b                   23.989(19)
_cell_length_c                   9.246(8)
_cell_measurement_reflns_used    1348
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.3028
_cell_measurement_theta_min      2.9069
_cell_volume                     1520(2)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2007)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       CCD_Profile_fitting
_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  0.0513
_diffrn_reflns_av_sigmaI/netI    0.0458
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       30
_diffrn_reflns_limit_k_min       -31
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            11684
_diffrn_reflns_theta_full        27.54
_diffrn_reflns_theta_max         27.54
_diffrn_reflns_theta_min         2.91
_exptl_absorpt_coefficient_mu    0.093
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.2345
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.348
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             648
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.192
_refine_diff_density_min         -0.156
_refine_diff_density_rms         0.034
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.048
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     210
_refine_ls_number_reflns         3469
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.048
_refine_ls_R_factor_all          0.0802
_refine_ls_R_factor_gt           0.0514
_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^)+(0.0765P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1281
_refine_ls_wR_factor_ref         0.1449
_reflns_number_gt                2331
_reflns_number_total             3469
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2cc35685f.txt
_cod_data_source_block           Form2
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7108474