Isomeric Schiff bases related by dual imino-group reversals
Ojala, William H.; Arola, Trina M.; Herrera, Nell; Balidemaj, Barjeta; Ojala, Charles R.; Acta Crystallographica Section C 63 (2007) o207–o211; doi:10.1107/S0108270107006233

data_2015888
_publ_section_title
;
 Isomeric Schiff bases related by dual imino-group reversals
;
_journal_coeditor_code           FA3067
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o207
_journal_page_last               o211
_journal_paper_doi               10.1107/S0108270107006233
_journal_volume                  63
_journal_year                    2007
_chemical_formula_iupac          'C22 H20 N2 O2'
_chemical_formula_moiety         'C22 H20 N2 O2'
_chemical_formula_sum            'C22 H20 N2 O2'
_chemical_formula_weight         344.40
_chemical_melting_point          .178E-177
_chemical_name_systematic
;
2,2'-dimethoxy-(p-phenylenedimethylene)dianiline
;
_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                 91.0680(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.1825(4)
_cell_length_b                   7.2077(4)
_cell_length_c                   17.3048(10)
_cell_measurement_reflns_used    4025
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.024
_cell_measurement_theta_min      2.355
_cell_volume                     895.70(9)
_computing_cell_refinement       'SAINT-Plus (Bruker, 2003)'
_computing_data_collection       'SMART (Bruker, 2001)'
_computing_data_reduction        SAINT-Plus
_computing_molecular_graphics    'PLATON (Spek, 2003)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker PLATFORM/SMART CCD area-detector'
_diffrn_measurement_method       '\f and \w scans'
_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  0.0252
_diffrn_reflns_av_sigmaI/netI    0.0168
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            8550
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         2.35
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.981
_exptl_absorpt_correction_T_min  0.954
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Bruker, 2000; Blessing, 1995)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.277
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             364
_exptl_crystal_size_max          0.52
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.130
_refine_diff_density_min         -0.171
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.062
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     119
_refine_ls_number_reflns         1583
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.062
_refine_ls_R_factor_all          0.0380
_refine_ls_R_factor_gt           0.0321
_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^)+(0.0455P)^2^+0.2159P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0845
_refine_ls_wR_factor_ref         0.0900
_reflns_number_gt                1392
_reflns_number_total             1583
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            fa3067.cif
_cod_data_source_block           II
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2015888
_cod_database_fobs_code          2015888