N-acylamino-pyridine-2,6-dione based heterocyclic dyes and their oxidative ring-degradation under alkaline condition
Geng, Jiao; Xu, Dan; Zhao, Xiao-Lei; Feng, Ya-Nan; Qian, Hui-Fen; Dai, Yuan; Huang, Wei; RSC Adv.  (2016) –; doi:10.1039/C6RA21019H

data_7226721
_publ_section_title
;
 N-acylamino-pyridine-2,6-dione based heterocyclic dyes and their
 oxidative ring-degradation under alkaline condition
;
_journal_name_full               'RSC Adv.'
_journal_paper_doi               10.1039/C6RA21019H
_journal_year                    2016
_chemical_formula_moiety         'C20 H22 N6 O6'
_chemical_formula_sum            'C20 H22 N6 O6'
_chemical_formula_weight         442.44
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2015-04-17 deposited with the CCDC.
2016-10-03 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.441(5)
_cell_length_b                   24.502(7)
_cell_length_c                   4.8317(15)
_cell_measurement_reflns_used    1022
_cell_measurement_temperature    291(2)
_cell_measurement_theta_max      19.5
_cell_measurement_theta_min      2.4
_cell_volume                     2064.8(11)
_computing_cell_refinement       SMART
_computing_data_collection       'SMART (BRUKER 2000)'
_computing_data_reduction        'SAINT (BRUKER 2000)'
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  SHELXTL
_computing_structure_solution    'SHELXTL (BRUKER 2000)'
_diffrn_ambient_temperature      291(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'BRUKER Smart Apex CCD area detector'
_diffrn_measurement_method       '\f and \w scans'
_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  0.0899
_diffrn_reflns_av_sigmaI/netI    0.1035
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       31
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       0
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            5015
_diffrn_reflns_theta_full        27.31
_diffrn_reflns_theta_max         27.31
_diffrn_reflns_theta_min         1.66
_exptl_absorpt_coefficient_mu    0.108
_exptl_absorpt_correction_T_max  0.9893
_exptl_absorpt_correction_T_min  0.9893
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, BRUKER(2000)'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.423
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             928
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.183
_refine_diff_density_min         -0.214
_refine_diff_density_rms         0.047
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   10(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.964
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     289
_refine_ls_number_reflns         2592
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.964
_refine_ls_R_factor_all          0.1429
_refine_ls_R_factor_gt           0.0461
_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^)+(0.0414P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0849
_refine_ls_wR_factor_ref         0.1166
_reflns_number_gt                1253
_reflns_number_total             2592
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6ra21019h2.cif
_cod_data_source_block           2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 4268 2015-11-12 08:31:59Z antanas 
;
_cod_original_sg_symbol_Hall     P2c-2n
_cod_original_sg_symbol_H-M      Pna21
_cod_database_code               7226721