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_1506524
_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 H15 N3 O'
_chemical_formula_weight         313.35
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c 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                   15.686(3)
_cell_length_b                   12.040(2)
_cell_length_c                   7.8796(15)
_cell_measurement_reflns_used    2357
_cell_measurement_temperature    203(2)
_cell_measurement_theta_max      25.682
_cell_measurement_theta_min      2.602
_cell_volume                     1488.1(5)
_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      203(2)
_diffrn_detector_area_resol_mean 8.366
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.941
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
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_diffrn_reflns_limit_k_max       15
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_diffrn_reflns_limit_l_min       -10
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_diffrn_standards_decay_%        0.0
_diffrn_standards_interval_time  480
_diffrn_standards_number         36
_exptl_absorpt_coefficient_mu    0.089
_exptl_absorpt_correction_T_max  0.9982
_exptl_absorpt_correction_T_min  0.9738
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.399
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.30
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_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0722P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0855
_refine_ls_wR_factor_ref         0.1145
_reflns_number_gt                1405
_reflns_number_total             1849
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol050138ssi20050121_074409.cif
_cod_data_source_block           PNO-P1
_cod_depositor_comments
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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 'geom and difmap' was changed
to 'mixed'.

Automatic conversion script
Id: cif_fix_values 6452 2018-10-05 10:23:21Z andrius 
;
_cod_original_cell_volume        1488.2(5)
_cod_original_sg_symbol_H-M      Pca2(1)
_cod_database_code               1506524