Room temperature phosphorescence and photochromism in a series of pyridine-based hybrid compounds
Liu, Tong; Jing, Xue-Mei; Chen, Jia-Li; Ding, Xue-Yao; Han, Song-De; Xue, Zhen-Zhen; Huang, Hong-Hua; Pan, Jie; CrystEngComm 28 (2026) 748–761; doi:10.1039/D5CE01077B

data_7251508
_publ_section_title
;
 Room temperature phosphorescence and photochromism in a series of
 pyridine-based hybrid compounds
;
_journal_issue                   3
_journal_name_full               CrystEngComm
_journal_page_first              748
_journal_page_last               761
_journal_paper_doi               10.1039/D5CE01077B
_journal_volume                  28
_journal_year                    2026
_chemical_formula_moiety         'C19 H21 Cd N7 O7'
_chemical_formula_sum            'C19 H21 Cd N7 O7'
_chemical_formula_weight         571.83
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2016/6
_audit_update_record
;
2025-07-23 deposited with the CCDC.	2025-12-09 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 93.455(3)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   27.4056(7)
_cell_length_b                   10.3739(3)
_cell_length_c                   16.0893(5)
_cell_measurement_reflns_used    17389
_cell_measurement_temperature    300(2)
_cell_measurement_theta_max      30.7200
_cell_measurement_theta_min      2.0960
_cell_volume                     4565.9(2)
_computing_cell_refinement       'CrysAlisPro 1.171.42.84a (Rigaku OD, 2023)'
_computing_data_collection       'CrysAlisPro 1.171.42.84a (Rigaku OD, 2023)'
_computing_data_reduction        'CrysAlisPro 1.171.42.84a (Rigaku OD, 2023)'
_computing_structure_refinement  'SHELXL-2016/6 (Sheldrick, 2016)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      300(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0474
_diffrn_reflns_av_unetI/netI     0.0384
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       32
_diffrn_reflns_limit_h_min       -32
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            35763
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.028
_diffrn_reflns_theta_max         25.027
_diffrn_reflns_theta_min         2.100
_exptl_absorpt_coefficient_mu    1.012
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.80607
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.42.84a (Rigaku Oxford Diffraction, 2023)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.664
_exptl_crystal_description       block
_exptl_crystal_F_000             2304
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.02
_refine_diff_density_max         4.844
_refine_diff_density_min         -1.740
_refine_diff_density_rms         0.223
_refine_ls_extinction_coef       0.0027(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2016/6 (Sheldrick 2016)'
_refine_ls_goodness_of_fit_ref   1.193
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     620
_refine_ls_number_reflns         8076
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.193
_refine_ls_R_factor_all          0.1244
_refine_ls_R_factor_gt           0.1142
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0609P)^2^+172.4362P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2984
_refine_ls_wR_factor_ref         0.3035
_reflns_Friedel_coverage         0.000
_reflns_number_gt                6900
_reflns_number_total             8076
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5ce01077b2.cif
_cod_data_source_block           A
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7251508
_shelx_shelxl_version_number     2016/6
_shelx_res_checksum              48003