Photoenolization via excited state double proton transfer induces 'turn on' fluorescence in diformyl diaryl dipyrromethane
K. C. Gowri Sreedevi; Ajesh P. Thomas; K. H. Aparna; Renuka Pradhan; M. L. P. Reddy; U. Lourderaj; A. Srinivasan; Chem.Commun. 50 (2014) 8667–; doi:10.1039/C4cc03668A

data_7115374
_publ_section_title
;
 Photoenolization via excited state double proton transfer induces 'turn
 on' fluorescence in diformyl diaryl dipyrromethane
;
_journal_name_full               Chem.Commun.
_journal_page_first              8667
_journal_paper_doi               10.1039/C4cc03668A
_journal_volume                  50
_journal_year                    2014
_chemical_formula_sum            'C26 H22 N2.5 O2'
_chemical_formula_weight         401.46
_chemical_melting_point          263
_chemical_name_common            DTDA
_chemical_name_systematic
;
?
;
_space_group_IT_number           43
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'F 2 -2d'
_symmetry_space_group_name_H-M   'F d d 2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.000(5)
_cell_angle_beta                 90.000(5)
_cell_angle_gamma                90.000(5)
_cell_formula_units_Z            16
_cell_length_a                   41.923(5)
_cell_length_b                   11.100(5)
_cell_length_c                   19.335(5)
_cell_measurement_reflns_used    8577
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      26.16
_cell_measurement_theta_min      2.57
_cell_volume                     8997(5)
_computing_cell_refinement       'APEX2/SAINT (Bruker, 2004)'
_computing_data_collection       'APEX2 (Bruker, 2004)'
_computing_data_reduction        'SAINT/XPREP (Bruker, 2004)'
_computing_molecular_graphics    '(Bruno etal,2002)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SIR92 (Altornare et al., 1993)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker axs kappa apex2 CCD Diffractometer'
_diffrn_measurement_method       '\w and \f scan'
_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  0.0302
_diffrn_reflns_av_sigmaI/netI    0.0200
_diffrn_reflns_limit_h_max       51
_diffrn_reflns_limit_h_min       -52
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            27734
_diffrn_reflns_theta_full        26.49
_diffrn_reflns_theta_max         26.49
_diffrn_reflns_theta_min         1.94
_exptl_absorpt_coefficient_mu    0.076
_exptl_absorpt_correction_T_max  0.9947
_exptl_absorpt_correction_T_min  0.9917
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.185
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       diamond
_exptl_crystal_F_000             3384
_exptl_crystal_size_max          0.11
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.246
_refine_diff_density_min         -0.193
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.9(16)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     277
_refine_ls_number_reflns         4628
_refine_ls_number_restraints     8
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0509
_refine_ls_R_factor_gt           0.0421
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0723P)^2^+3.3783P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1137
_refine_ls_wR_factor_ref         0.1207
_reflns_number_gt                3987
_reflns_number_total             4628
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4cc03668a2.cif
_cod_data_source_block           DTDA
_cod_depositor_comments
;

2018-03-12
Z value and formula fixed to values more according to usual
chemical conventions.                 miguel
;
_cod_original_formula_sum            'C104 H88 N10 O8'
_cod_original_formula_weight         1605.84
_cod_original_formula_units_Z            4
_cod_original_sg_symbol_Hall     'F2 -2d'
_cod_original_sg_symbol_H-M      Fdd2
_cod_database_code               7115374