Dimethoxy-substituted triphenylamine-based donor–acceptor fluorophores: tunable solid-state emission and reversible thermofluorochromism
Priyadharsan, R. Rameshbabu; Karthikeyan, Subramanian; Pannipara, Mehboobali; Al-Sehemi, Abdullah G.; Moon, Dohyun; Anthony, Savarimuthu Philip; CrystEngComm 28 (2026) 1083–1090; doi:10.1039/D5CE01002K

data_7251569
_publ_section_title
;
 Dimethoxy-substituted triphenylamine-based donor--acceptor fluorophores:
 tunable solid-state emission and reversible thermofluorochromism
;
_journal_issue                   6
_journal_name_full               CrystEngComm
_journal_page_first              1083
_journal_page_last               1090
_journal_paper_doi               10.1039/D5CE01002K
_journal_volume                  28
_journal_year                    2026
_chemical_formula_moiety         'C26 H24 N2 O4'
_chemical_formula_sum            'C26 H24 N2 O4'
_chemical_formula_weight         428.47
_chemical_name_common            DMT-ECA
_chemical_name_systematic
'ethyl (Z)-2-cyano-3-(4-(diphenylamino)-2,6-dimethoxyphenyl) acrylate'
_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-2019/3
_audit_update_record
;
2025-10-20 deposited with the CCDC.	2026-01-06 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 98.30(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.5990(17)
_cell_length_b                   15.820(3)
_cell_length_c                   16.419(3)
_cell_measurement_reflns_used    65345
_cell_measurement_temperature    220(2)
_cell_measurement_theta_max      30.000
_cell_measurement_theta_min      0.361
_cell_volume                     2210.2(7)
_computing_cell_refinement       '<i>HKL3000sm</i>(Otwinowski & Minor, 1997)'
_computing_data_collection
'<i>PAL BL2D-SMDC Program</i>(Shin et.al, 2016)'
_computing_data_reduction        '<i>HKL3000sm</i>(Otwinowski & Minor, 1997)'
_computing_molecular_graphics    '<i>DIAMOND 4</i>(Putx&Brandenburg, 2014)'
_computing_publication_material  '<i>publCIF</i>(Westrip, 2010)'
_computing_structure_refinement  '<i>SHELXL-2018</i>(Sheldrick, 2018)'
_computing_structure_solution    '<i>SHELXT-2018</i>(Sheldrick, 2018)'
_diffrn_ambient_temperature      220(2)
_diffrn_measured_fraction_theta_full 0.961
_diffrn_measured_fraction_theta_max 0.950
_diffrn_measurement_device_type  'Rayonix MX225HS CCD area detector'
_diffrn_measurement_method       'omega scan'
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.630
_diffrn_reflns_av_R_equivalents  0.0611
_diffrn_reflns_av_unetI/netI     0.0496
_diffrn_reflns_Laue_measured_fraction_full 0.961
_diffrn_reflns_Laue_measured_fraction_max 0.950
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            20707
_diffrn_reflns_point_group_measured_fraction_full 0.961
_diffrn_reflns_point_group_measured_fraction_max 0.950
_diffrn_reflns_theta_full        22.210
_diffrn_reflns_theta_max         24.999
_diffrn_reflns_theta_min         1.593
_diffrn_source                   'PLSII 2D bending magnet'
_exptl_absorpt_coefficient_mu    0.068
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.953
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details
'<i>HKL3000sm Scalepack</i>(Otwinowski et.al,2003)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.288
_exptl_crystal_description       needle
_exptl_crystal_F_000             904
_exptl_crystal_size_max          0.097
_exptl_crystal_size_mid          0.008
_exptl_crystal_size_min          0.007
_refine_diff_density_max         0.381
_refine_diff_density_min         -0.283
_refine_diff_density_rms         0.046
_refine_ls_extinction_coef       0.028(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2019/2 (Sheldrick 2019)'
_refine_ls_goodness_of_fit_ref   1.043
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     293
_refine_ls_number_reflns         5317
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.043
_refine_ls_R_factor_all          0.0877
_refine_ls_R_factor_gt           0.0552
_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^)+(0.0718P)^2^+0.4652P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1393
_refine_ls_wR_factor_ref         0.1571
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3477
_reflns_number_total             5317
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5ce01002k2.cif
_cod_data_source_block           SPA1045
_cod_original_cell_volume        2210.2(8)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7251569
_shelx_shelxl_version_number     2019/3
_shelx_estimated_absorpt_t_min   0.993
_shelx_estimated_absorpt_t_max   1.000
_shelx_res_checksum              58209