Novel photochromic spiroheterocyclic molecules via oxidation of 1,8-diaminonaphthalene.
Davis, Riju; Tamaoki, Nobuyuki; Organic letters 7 (2005) 1461–1464; doi:10.1021/ol050138s

data_1506518
_publ_section_title
;
 Novel photochromic spiroheterocyclic molecules via oxidation of
 1,8-diaminonaphthalene.
;
_journal_issue                   8
_journal_name_full               'Organic letters'
_journal_page_first              1461
_journal_page_last               1464
_journal_paper_doi               10.1021/ol050138s
_journal_volume                  7
_journal_year                    2005
_chemical_formula_sum            'C20 H16 N4'
_chemical_formula_weight         312.37
_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   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.3581(7)
_cell_length_b                   23.522(2)
_cell_length_c                   7.8293(7)
_cell_measurement_reflns_used    6574
_cell_measurement_temperature    183(2)
_cell_measurement_theta_max      28.272
_cell_measurement_theta_min      2.588
_cell_volume                     1539.2(2)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      183(2)
_diffrn_detector_area_resol_mean 8.366
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating unit'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0275
_diffrn_reflns_av_sigmaI/netI    0.0237
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       31
_diffrn_reflns_limit_k_min       -31
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            11193
_diffrn_reflns_theta_full        28.29
_diffrn_reflns_theta_max         28.29
_diffrn_reflns_theta_min         2.59
_diffrn_standards_decay_%        0.0
_diffrn_standards_interval_time  720
_diffrn_standards_number         236
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.9975
_exptl_absorpt_correction_T_min  0.9796
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.348
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.261
_refine_diff_density_min         -0.247
_refine_diff_density_rms         0.049
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.916
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     237
_refine_ls_number_reflns         2051
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.916
_refine_ls_R_factor_all          0.0383
_refine_ls_R_factor_gt           0.0379
_refine_ls_shift/su_max          0.028
_refine_ls_shift/su_mean         0.004
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0872P)^2^+0.2013P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1007
_refine_ls_wR_factor_ref         0.1012
_reflns_number_gt                2009
_reflns_number_total             2051
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol050138ssi20050121_074409.cif
_cod_data_source_block           PNI
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_atom_sites_solution_hydrogens' value ' difmap and geom' was changed
to 'mixed'.

Automatic conversion script
Id: cif_fix_values 6452 2018-10-05 10:23:21Z andrius 
;
_cod_original_sg_symbol_H-M      Pna2(1)
_cod_original_formula_sum        'C20 H16 N4 '
_cod_database_code               1506518