Crystalline photochromism of N-salicylidene-2,6-dialkylanilines: advantage of 2,6-dialkyl substituents of aniline for preparation of photochromic Schiff base crystals
Fukuda, Hisatane; Amimoto, Kiichi; Koyama, Hiroyuki; Kawato, Toshio; Organic & Biomolecular Chemistry 1 (2003) 1578–; doi:10.1039/b212295b

data_7151395
_publ_section_title
;
 Crystalline photochromism of N-salicylidene-2,6-dialkylanilines:
 advantage of 2,6-dialkyl substituents of aniline for preparation of
 photochromic Schiff base crystals
;
_journal_issue                   9
_journal_name_full               'Organic &amp;  Biomolecular Chemistry'
_journal_page_first              1578
_journal_paper_doi               10.1039/b212295b
_journal_volume                  1
_journal_year                    2003
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C25 H33 Cl2 N1 O1'
_chemical_formula_sum            'C25 H33 Cl2 N O'
_chemical_formula_weight         434.42
_chemical_melting_point          459
_chemical_name_systematic
;
N-(3,5-dichlorosalicylidene)-2,4,6-tri-tert-butylaniline
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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      2.2
_audit_creation_date             2002-12-10T17:05:37-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 97.0510(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   13.8050(4)
_cell_length_b                   11.6390(3)
_cell_length_c                   15.6289(4)
_cell_measurement_reflns_used    0
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      0
_cell_measurement_theta_min      0
_cell_measurement_wavelength     0.71073
_cell_volume                     2492.20(12)
_computing_cell_refinement       'Rigaku RAXIS-IV'
_computing_data_collection       'Rigaku RAXIS-IV'
_computing_data_reduction        'Rigaku RAXIS-IV'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.1178
_diffrn_reflns_av_unetI/netI     0.0899
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            22697
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         1.86
_exptl_absorpt_coefficient_mu    0.275
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.158
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             928
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.298
_refine_diff_density_min         -0.243
_refine_diff_density_rms         0.071
_refine_ls_extinction_coef       0.0034(9)
_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   1.104
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     366
_refine_ls_number_reflns         5711
_refine_ls_number_restraints     93
_refine_ls_restrained_S_all      1.098
_refine_ls_R_factor_all          0.1867
_refine_ls_R_factor_gt           0.0883
_refine_ls_shift/su_max          0.019
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0826P)^2^+0.7226P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1711
_refine_ls_wR_factor_ref         0.2128
_reflns_number_gt                2872
_reflns_number_total             5711
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b212295b.txt
_cod_data_source_block           1e
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7151395