Photochromism of spiropyrans and spirooxazines in the solid state: low temperature enhances photocoloration
Harada, Jun; Kawazoe, Yuta; Ogawa, Keiichiro; Chemical Communications 46 (2010) 2593–; doi:10.1039/b925514a

data_7105407
_publ_section_title
;
 Photochromism of spiropyrans and spirooxazines in the solid state: low
 temperature enhances photocoloration
;
_journal_issue                   15
_journal_name_full               'Chemical Communications'
_journal_page_first              2593
_journal_paper_doi               10.1039/b925514a
_journal_volume                  46
_journal_year                    2010
_chemical_formula_sum            'C23 H21 N O'
_chemical_formula_weight         327.41
_chemical_melting_point          451.4
_chemical_name_systematic
;
1,3,3-Trimethylspiro[indoline-2,3'-[3H]-naphtho[2,1-b]pyran]
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 103.501(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.6137(12)
_cell_length_b                   6.3473(5)
_cell_length_c                   19.4928(16)
_cell_measurement_reflns_used    4378
_cell_measurement_temperature    300
_cell_measurement_theta_max      25.6
_cell_measurement_theta_min      2.9
_cell_volume                     1758.1(2)
_computing_cell_refinement       'SAINT (Bruker, 1998)'
_computing_data_collection       'SMART (Bruker, 1998)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      300
_diffrn_detector_area_resol_mean 8.192
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker SMART 1000 CCD diffractometer'
_diffrn_measurement_method       \w_scan
_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  0.0382
_diffrn_reflns_av_sigmaI/netI    0.0315
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            26272
_diffrn_reflns_theta_full        30.02
_diffrn_reflns_theta_max         30.02
_diffrn_reflns_theta_min         1.58
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.075
_exptl_absorpt_correction_T_max  0.9925
_exptl_absorpt_correction_T_min  0.9852
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2002)'
_exptl_crystal_colour            pale_pink
_exptl_crystal_density_diffrn    1.237
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             696
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.270
_refine_diff_density_min         -0.160
_refine_diff_density_rms         0.038
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.024
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     310
_refine_ls_number_reflns         5123
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.024
_refine_ls_R_factor_all          0.1021
_refine_ls_R_factor_gt           0.0531
_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^)+(0.0706P)^2^+0.3652P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1313
_refine_ls_wR_factor_ref         0.1588
_reflns_number_gt                2984
_reflns_number_total             5123
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b925514a.txt
_cod_data_source_block           SNP_rt
_cod_original_sg_symbol_H-M      P_1_21/n_1
_cod_database_code               7105407