Tuning the Photoinduced Electron-Transfer Thermodynamics in 1,3,5-Triaryl-2-pyrazoline Fluorophores: X-ray Structures, Photophysical Characterization, Computational Analysis, and in Vivo Evaluation
Christoph J. Fahrni; Liuchun Yang; Donald G. VanDerveer; Journal of the American Chemical Society 125 (2003) 3799–3812; doi:10.1021/ja028266o

data_4113604
_publ_contact_author             'Christoph J. Fahrni'
_publ_contact_author_email       fahrni@chemistry.gatech.edu
_publ_section_title
;
 Tuning the Photoinduced Electron-Transfer Thermodynamics in
 1,3,5-Triaryl-2-pyrazoline Fluorophores: X-ray Structures, Photophysical
 Characterization, Computational Analysis, and in Vivo Evaluation
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              3799
_journal_page_last               3812
_journal_paper_doi               10.1021/ja028266o
_journal_volume                  125
_journal_year                    2003
_chemical_formula_sum            'C26 H26 N4'
_chemical_formula_weight         394.51
_chemical_melting_point          352(1)
_chemical_name_systematic
; 
4-[5-(4-Diethylamino-phenyl)-1-phenyl-4, 5-dihydro-1H-
pyrazol-3-yl]-benzonitrile
;
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 103.033(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.108(3)
_cell_length_b                   15.876(4)
_cell_length_c                   9.978(2)
_cell_measurement_reflns_used    800
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      18.64
_cell_measurement_theta_min      1.66
_cell_volume                     2177.3(8)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      193(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker 1K CCD'
_diffrn_measurement_method       'omega scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1102
_diffrn_reflns_av_sigmaI/netI    0.1406
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            11254
_diffrn_reflns_theta_full        25.02
_diffrn_reflns_theta_max         25.02
_diffrn_reflns_theta_min         1.48
_exptl_absorpt_coefficient_mu    0.072
_exptl_absorpt_correction_T_max  0.9958
_exptl_absorpt_correction_T_min  0.9806
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Blessing, Acta Cryst. (1995) A51 33-38'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.204
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             840
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.236
_refine_diff_density_min         -0.196
_refine_diff_density_rms         0.052
_refine_ls_extinction_coef       0.0044(11)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.985
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     293
_refine_ls_number_reflns         3830
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.985
_refine_ls_R_factor_all          0.1615
_refine_ls_R_factor_gt           0.0679
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0630P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1334
_refine_ls_wR_factor_ref         0.1720
_reflns_number_gt                1842
_reflns_number_total             3830
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja028266osi20021210_012116_2.cif
_cod_data_source_block           1b
_cod_original_cell_volume        2177.2(8)
_cod_database_code               4113604