Synthesis and Properties of Fluorescence Dyes: Tetracyclic Pyrazolo[3,4-b]Pyridine-Based Coumarin Chromophores with Intramolecular Charge Transfer Character
Jianhong Chen; Weimin Liu; Jingjin Ma; Haitao Xu; Jiasheng Wu; Xianglin Tang; Zhiyuan Fan; Pengfei Wang; Journal of Organic Chemistry 77 (2012) 3475–3482; doi:10.1021/jo3002722

data_4027128
_publ_section_title
;
 Synthesis and Properties of Fluorescence Dyes: Tetracyclic
 Pyrazolo[3,4-b]Pyridine-Based Coumarin Chromophores with Intramolecular
 Charge Transfer Character
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              3475
_journal_page_last               3482
_journal_paper_doi               10.1021/jo3002722
_journal_volume                  77
_journal_year                    2012
_chemical_formula_moiety         'C24 H22 N4 O2'
_chemical_formula_sum            'C24 H22 N4 O2'
_chemical_formula_weight         398.46
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 101.92(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.4584(13)
_cell_length_b                   20.649(4)
_cell_length_c                   15.101(3)
_cell_measurement_reflns_used    5872
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.4844
_cell_measurement_theta_min      0.9861
_cell_volume                     1970.4(7)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2008)'
_computing_molecular_graphics
;
 Mercury: visualization and analysis of crystal structures, C. F. Macrae,
 P. R. Edgington, P. McCabe, E. Pidcock, G. P. Shields, R. Taylor,
 M. Towler and J. van de Streek, J. Appl. Cryst., 39, 453-457, 2006.
;
_computing_publication_material  'SHELX-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'MM007HF + CCD (Saturn724+)'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_diffrn_radiation_monochromator  Confocal
_diffrn_radiation_source         'Rotating Anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0635
_diffrn_reflns_av_sigmaI/netI    0.0534
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            17579
_diffrn_reflns_theta_full        27.45
_diffrn_reflns_theta_max         27.45
_diffrn_reflns_theta_min         1.69
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.7635
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrystalClear (Rigaku Inc., 2008)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.343
_exptl_crystal_description       block
_exptl_crystal_F_000             840
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.240
_refine_diff_density_min         -0.179
_refine_diff_density_rms         0.048
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.225
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     274
_refine_ls_number_reflns         4491
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.225
_refine_ls_R_factor_all          0.1003
_refine_ls_R_factor_gt           0.0785
_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^)+(0.0308P)^2^+1.0694P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1348
_refine_ls_wR_factor_ref         0.1435
_reflns_number_gt                3690
_reflns_number_total             4491
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo3002722_si_004.cif
_cod_data_source_block           a
_cod_database_code               4027128