Photochromic Diarylethene-Containing Ionic Liquids and N-Heterocyclic Carbenes
Vivian Wing-Wah Yam; Jason Ka-Wai Lee; Chi-Chiu Ko; Nianyong Zhu; Journal of the American Chemical Society 131 (2009) 912–913; doi:10.1021/ja808791e

data_4103832
_publ_section_title
;
 Photochromic Diarylethene-Containing Ionic Liquids and N-Heterocyclic
 Carbenes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              912
_journal_page_last               913
_journal_paper_doi               10.1021/ja808791e
_journal_volume                  131
_journal_year                    2009
_chemical_formula_moiety         'C32 H36 N4 S4'
_chemical_formula_sum            'C32 H36 N4 S4'
_chemical_formula_weight         604.89
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.035(2)
_cell_length_b                   10.918(2)
_cell_length_c                   25.983(5)
_cell_measurement_reflns_used    0
_cell_measurement_temperature    301(2)
_cell_measurement_theta_max      0
_cell_measurement_theta_min      0
_cell_volume                     3130.4(10)
_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      301(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0407
_diffrn_reflns_av_sigmaI/netI    0.0591
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            9066
_diffrn_reflns_theta_full        25.68
_diffrn_reflns_theta_max         25.68
_diffrn_reflns_theta_min         1.57
_exptl_absorpt_coefficient_mu    0.332
_exptl_absorpt_correction_T_max  0.9676
_exptl_absorpt_correction_T_min  0.9070
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.283
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1280
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.198
_refine_diff_density_min         -0.189
_refine_diff_density_rms         0.039
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.883
_refine_ls_hydrogen_treatment    ride-on
_refine_ls_matrix_type           full
_refine_ls_number_parameters     186
_refine_ls_number_reflns         2962
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.883
_refine_ls_R_factor_all          0.0868
_refine_ls_R_factor_gt           0.0397
_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^)+(0.0461P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0856
_refine_ls_wR_factor_ref         0.0973
_reflns_number_gt                1687
_reflns_number_total             2962
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja808791e_si_002.cif
_cod_data_source_block           L1
_cod_original_cell_volume        3130.4(11)
_cod_database_code               4103832