The amide bridge in donor–acceptor systems: delocalization depends on push–pull stress
Maldonado-Domínguez, Mauricio; Arcos-Ramos, Rafael; Romero, Margarita; Flores-Pérez, Blas; Farfán, Norberto; Santillan, Rosa; Lacroix, Pascal G.; Malfant, Isabelle; New Journal of Chemistry 38 (2014) 260–; doi:10.1039/c3nj01176c

data_7054005
_publ_section_title
;
 The amide bridge in donor--acceptor systems: delocalization depends on
 push--pull stress
;
_journal_issue                   1
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              260
_journal_paper_doi               10.1039/c3nj01176c
_journal_volume                  38
_journal_year                    2014
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C20 H19 N3 O5'
_chemical_formula_sum            'C20 H19 N3 O5'
_chemical_formula_weight         381.38
_chemical_name_common            'Compound X'
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.4
_audit_creation_date             2012-06-07T18:26:19-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                98.1690(21)
_cell_angle_beta                 99.3016(19)
_cell_angle_gamma                92.6732(19)
_cell_formula_units_Z            2
_cell_length_a                   4.94270(20)
_cell_length_b                   12.55740(40)
_cell_length_c                   14.66120(50)
_cell_measurement_reflns_used    20580
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      2.91
_cell_measurement_wavelength     0.71073
_cell_volume                     886.65(6)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Bruker AXS BV, 1997-2004)'
_computing_data_reduction
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SIR2004 (Giacovazzo et al, 2004)'
_diffrn_ambient_temperature      298(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.948
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       'CCD rotation images, thick slices'
_diffrn_orient_matrix_type       'by Bruker AXS Collect from scalepack cell'
_diffrn_orient_matrix_UB_11      -0.502386E-1
_diffrn_orient_matrix_UB_12      -0.264198E-1
_diffrn_orient_matrix_UB_13      0.566929E-1
_diffrn_orient_matrix_UB_21      -0.146605
_diffrn_orient_matrix_UB_22      -0.510823E-1
_diffrn_orient_matrix_UB_23      -0.406378E-1
_diffrn_orient_matrix_UB_31      0.135012
_diffrn_orient_matrix_UB_32      -0.565502E-1
_diffrn_orient_matrix_UB_33      -0.49167E-2
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0461
_diffrn_reflns_av_unetI/netI     0.0282
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            20268
_diffrn_reflns_reduction_process
;
 Scaled and merged with Sortav
 R.H. Blessing, (1987) Cryst. Rev. 1, 3-58
 R.H. Blessing, (1989) J. Appl. Cryst. 22, 396-397
;
_diffrn_reflns_theta_full        25
_diffrn_reflns_theta_max         26.64
_diffrn_reflns_theta_min         4.01
_diffrn_source                   'Enraf Nonius FR590'
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_T_max  1.0103
_exptl_absorpt_correction_T_min  0.9557
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
        [c.f. r.h. blessing, acta cryst. (1995), a51, 33-38]
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.429
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             400
_exptl_crystal_size_max          0.325
_exptl_crystal_size_mid          0.175
_exptl_crystal_size_min          0.075
_refine_diff_density_max         0.205
_refine_diff_density_min         -0.19
_refine_diff_density_rms         0.034
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.045
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     259
_refine_ls_number_reflns         3543
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.045
_refine_ls_R_factor_all          0.0658
_refine_ls_R_factor_gt           0.0482
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0693P)^2^+0.1585P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1198
_refine_ls_wR_factor_ref         0.1323
_reflns_number_gt                2737
_reflns_number_total             3543
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            c3nj01176c.txt
_cod_data_source_block           san623
_cod_original_cell_volume        886.647(55)
_cod_database_code               7054005