Study of influence of anion nature on crystal packing features and feasibility of [2 + 2] photocycloaddition reaction in protonated forms of dimethoxystyrylheterocycles
Kuzmina, Lyudmila G.; Vedernikov, Artem I.; Sazonov, Sergey K.; Aleksandrova, Nadezhda A.; Alfimov, Michael V.; Gromov, Sergey P.; CrystEngComm  (2026) –; doi:10.1039/D5CE01173F

data_7251628
_publ_section_title
;
 Study of the influence of anion nature on crystal packing features and
 feasibility of [2 + 2] photocycloaddition reaction in protonated forms of
 dimethoxystyrylheterocycles
;
_journal_issue                   16
_journal_name_full               CrystEngComm
_journal_page_first              2560
_journal_page_last               2577
_journal_paper_doi               10.1039/D5CE01173F
_journal_volume                  28
_journal_year                    2026
_chemical_formula_moiety         'C15 H16 N O2, C6 H2 N3 O7'
_chemical_formula_sum            'C21 H18 N4 O9'
_chemical_formula_weight         470.39
_chemical_name_systematic
;
4-[(E)-2-(3,4-dimethoxyphenyl)vinyl]pyridinium picrate
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2025-10-10 deposited with the CCDC.	2026-02-16 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 99.496(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.2823(5)
_cell_length_b                   12.1220(7)
_cell_length_c                   20.5398(11)
_cell_measurement_reflns_used    1652
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      25.824
_cell_measurement_theta_min      2.530
_cell_volume                     2033.9(2)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker SMART-6K'
_diffrn_measurement_method       /W
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0602
_diffrn_reflns_av_unetI/netI     0.0849
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            14645
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.499
_diffrn_reflns_theta_min         1.958
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.123
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.536
_exptl_crystal_description       needle
_exptl_crystal_F_000             976
_exptl_crystal_size_max          0.260
_exptl_crystal_size_mid          0.060
_exptl_crystal_size_min          0.040
_refine_diff_density_max         0.497
_refine_diff_density_min         -0.375
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.997
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     433
_refine_ls_number_reflns         4671
_refine_ls_number_restraints     218
_refine_ls_restrained_S_all      0.982
_refine_ls_R_factor_all          0.1023
_refine_ls_R_factor_gt           0.0458
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+1.1007P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0966
_refine_ls_wR_factor_ref         0.1225
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2676
_reflns_number_total             4671
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5ce01173f2.cif
_cod_data_source_block           ii
_cod_depositor_comments
'Adding full bibliography for 7251618--7251632.cif.'
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7251628
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.969
_shelx_estimated_absorpt_t_max   0.995
_shelx_res_checksum              8681