Influence of C3′- and C4′-substitutions on fluorescence, crystal packing, and physicochemical properties of flavonol
Demidov, Oleksii O.; Chepeleva, Ludmila V.; Shishkina, Svitlana V.; Gladkov, Eugene S.; Kyrychenko, Alexander; Linnik, Rostyslav P.; Roshal, Alexander D.; RSC Advances 15 (2025) 36300–36318; doi:10.1039/D5RA05790F

data_7250928
_publ_section_title
;
 Influence of C3&#x2032;- and C4&#x2032;-substitutions on fluorescence,
 crystal packing, and physicochemical properties of flavonol
;
_journal_issue                   43
_journal_name_full               'RSC Advances'
_journal_page_first              36300
_journal_page_last               36318
_journal_paper_doi               10.1039/D5RA05790F
_journal_volume                  15
_journal_year                    2025
_chemical_formula_moiety         'C16 H12 O4'
_chemical_formula_sum            'C16 H12 O4'
_chemical_formula_weight         268.26
_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
_atom_sites_solution_primary     dual
_audit_creation_date             2024-02-26
_audit_creation_method
;
Olex2 1.5
(compiled 2023.08.24 svn.re1ec1418 for OlexSys, GUI svn.r6817)
;
_audit_update_record
;
2025-09-17 deposited with the CCDC.	2025-09-23 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 95.119(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   11.2635(6)
_cell_length_b                   4.9880(3)
_cell_length_c                   22.0194(12)
_cell_measurement_reflns_used    5702
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      26.41
_cell_measurement_theta_min      2.48
_cell_volume                     1232.17(12)
_computing_cell_refinement       'SAINT (Bruker AXS, 2015)'
_computing_data_collection       'APEXII (Bruker AXS, 2014)'
_computing_data_reduction        'SAINT (Bruker AXS, 2015)'
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2016/6 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0525
_diffrn_reflns_av_unetI/netI     0.0303
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            16340
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        24.995
_diffrn_reflns_theta_max         24.995
_diffrn_reflns_theta_min         2.479
_diffrn_source_current           30.0
_diffrn_source_power             1.2
_diffrn_source_voltage           40.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            'light yellow'
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.446
_exptl_crystal_description       block
_exptl_crystal_F_000             560
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.146
_refine_diff_density_min         -0.198
_refine_diff_density_rms         0.040
_refine_ls_extinction_coef       0.053(4)
_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   1.042
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     184
_refine_ls_number_reflns         2158
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.042
_refine_ls_R_factor_all          0.0522
_refine_ls_R_factor_gt           0.0417
_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^)+(0.0507P)^2^+0.5498P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1038
_refine_ls_wR_factor_ref         0.1142
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1751
_reflns_number_total             2158
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5ra05790f2.cif
_cod_data_source_block           3b
_cod_database_code               7250928
_shelx_shelxl_version_number     2016/6
_shelx_estimated_absorpt_t_max   0.992
_shelx_estimated_absorpt_t_min   0.979
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups, All O(H) groups
2.a Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3A), C4(H4), C5(H5), C11(H11), C12(H12), C14(H14), C15(H15)
2.b Idealised Me refined as rotating group:
 C16(H16A,H16B,H16C)
2.c Idealised tetrahedral OH refined as rotating group:
 O3(H3)
;
_shelx_res_checksum              78104
_olex2_submission_special_instructions 'No special instructions were received'